Production of the leptophilic Z' boson at the future colliders has been proposed as one of the benchmark BSM scenarios for the Briefing Book being prepared for the 2026 update of the European Strategy for Particle Physics. Presented in this contributions are results on the sensitivity of the ILC experiment to $L_e - L_\mu$ scenario. Expected cross section limits as a function of the Z' boson...
Since its inception, the field of Advanced Accelerators has regarded future particle-physics colliders as the ultimate application of > 1 GV/m accelerator technology. Over the last decades, rapid experimental and theoretical progress [1,2,3] drove a conceptual evolution of potential future colliders based on Wakefield Accelerator (WFA) technology. The recent P5 Report [4] calls for “vigorous...
In this talk, we discuss the possibility of detecting new SM-neutral vector bosons ($Z'$) that couple exclusively to leptons at the FCC-ee. Focusing on the $Z'$ production with a radiated photon, we show that the FCC-ee can significantly extend the unprobed parameter space by increasing the exclusion in the coupling by one to two orders of magnitude in the kinematically allowed mass range...
CERN is investigating two major linear collider concepts as successors to the LHC: the Compact Linear Collider (CLIC) and the Linear Collider Facility (LCF), the latter being based on the International Linear Collider (ILC) design. Both proposals involve twin laser-straight 5.6m internal diameter tunnels, extending to lengths of 29.6km for CLIC and 33.5km for LCF, forming symmetric layouts...
In the scope of the MEXT ATD and the ILC Technology Network an ILC prototype cryomodule is currently being built at KEK. The cryomodule consists of several sub-systems, such as eight 1.3 GHz 9-cell TESLA-type superconducting cavities, fundamental power couplers, cavity frequency tuners, cavity magnetic shielding, and a superconducting quadrupole magnet. In addition to these, further external...
We present results from a global fit of Standard Model parameters and dimension-6 SMEFT Wilson coefficients that includes electroweak, Drell-Yan, Higgs-boson, top-quark, and flavour observables. Fits obtained by floating individual coefficients are also discussed. The leading-order scale dependence of the SMEFT Wilson coefficients is consistently included in the evolution from the UV scale to...
Several new physics scenarios still allow for novel scalar states with masses below a few hundred GeV. In this talk, I will give a short overview on such scenarios and comment on some recent search studies at Higgs factories.
I will present a global study of the reach in Higgs, electroweak, and top quark couplings at the future high-energy particle colliders proposed in the context of the European Strategy for Particle Physics 2026 Update (ESPPU26). I will discuss electron-positron circular (FCC-ee, CEPC) and linear (LCF) colliders. The global fit results, produced with the latest version of the SMEFiT code, take...
Structure-wakefield acceleration (SWFA) presents a promising route to a multi-TeV linear collider by combining GV/m-class gradients with high wall-plug efficiency and components suitable for industrial-scale production. In SWFA, a high-charge drive beam excites wakefields in engineered solid-state structures to accelerate a low-emittance “main” beam. Prospective collider configurations are...
Superconducting Magnet Division, Brookhaven National Laboratory invented a unique superconducting magnet design and development technology which can be considered as 3D printing of Superconducting magnets. The magnets developed using this technology are known as Direct Wind Magnets. The magnets developed using this technology are deployed at several colliders, accelerators and experimental...
The International Linear Collider (ILC) Main Linac consists of a series of cryomodules, one third of which are composed by eight 9-cell superconducting RF (SRF) cavities and a superconducting quadrupole (SCQ) package. The electrons and positrons are focused by the quadrupole and steered by the two dipoles included in the SCQ magnet. Large expected dark currents are originated at the SRF...
The physics program of the Higgs factory will focus on measurements of the 125 GeV Higgs boson, with the Higgs-strahlung process being the dominant production channel at 250 GeV. However, similar production of exotic light scalars, in a scalar-strahlug process, is still not excluded by the existing experimental data, provided their coupling to the SM gauge bosons is sufficiently suppressed....
e+e- colliders operating at energies below the di-Higgs production threshold can provide information on the trilinear Higgs self-coupling lambda via its loop contributions to single Higgs production processes and electroweak precision observables. We investigate how well a non-SM value of lambda can be determined indirectly via its loop contributions to a global EFT fit. Using a doublet...
The 10 TeV Wakefield Collider Design Study [1] aims to produce a self-consistent, start-to-end design of a 10 TeV-center-of-mass linear collider based on wakefields technology. One of the considered options for driving the main linac is beam-driven plasma wakefield acceleration (PWFA). The goal of the PWFA-Linac Working Group is to identify the main challenges and showstoppers, and to define a...
Beam-beam interactions constitute an important source of background at any electron-positron ($e^{+}e^{-}$) collider, generating the so-called beam-beam background, with important implications for the design of detectors and their performance. In this talk, we will analyze the impact of beam-beam background for the Cool Copper Collider (C$^3$), utilizing full detector simulation for the SiD...
The direct pair-production of the superpartner of the $\tau$-lepton, the $\widetilde{\tau}$,
is one
of the most interesting channels to search for SUSY in:
the $\widetilde{\tau}$ is
likely to be the lightest of the scalar leptons,
and is one of the most experimentally challennging ones.
The current model-independent $\widetilde{\tau}$ limits come from LEP,
while limits obtained at the...
Determining Triple Gauge Boson Couplings at 250 GeV Higgs Factories
We study the extraction of (anomalous) $ZWW/\gamma WW$ triple gauge couplings (aTGC) in the $e^+e^-\rightarrow \ell\nu q\bar{q}$ process at $250\,\text{GeV}$ from full simulation and reconstruction with the ILD detector.
Determining aTGC at the sub-permille level is vital for the precise and consistent determination of...
I will review recent developments in the theory of the energy spectrum of luminosity at 10 TeV e+e- colliders and the implications for physics.
The existence of Higgs-like scalars, which could be produced at
electron-positron collider in association with a Z boson, is predicted
by many BSM models and, assuming a small
coupling to the Z boson, still not excluded by experimental data.
Prospects for discovering such an scalar at future Higgs
factories have been studied by different methods.
The most model-independent one is based...
The precision physics program at a Higgs/top/EW factory requires a new generation of vertex detectors, that achieve excellent position and time resolution with a contribution to the material budget of the order of 0.1% of a radiation length per layer. At the same time, the vertex detector must have excellent thermo-mechanical stability. A solution based on CMOS sensors arranged in all-Silicon...
A central goal of future collider experiments is to probe the shape of the Higgs potential. This requires access to trilinear scalar couplings, and in particular the self-coupling of the detected Higgs boson. While this coupling is fixed in the Standard Model (SM), it can be significantly modified in many Beyond the Standard Model (BSM) scenarios, which are often linked to solutions of open...
Status report about the ILC undulator-based positron source is given including ongoing R&D issues (target, wheel, OMD, polarization issues). Options for an undulator-based positron source for CLIC and HALHF will also be discussed.
In the talk the parameter determination of the fundamental parameters in the supersymmetric MSSM is discussed and in particular its relevance wrt to dark matter determination. The importance of polarized beams and threshold scans is critically analyzed. Precision requirements of masses, cross sections and asymmetries has been worked out. The impact of virtual particles masses has been analyzed...
3D integrated silicon devices offer the possibility of heterogeneous integration of LGAD sensors with fast-timing readout electronics in 28nm CMOS, potentially enabling a new generation of monolithic timing detectors using 3D integration. Propelled by industry applications, 3D-integration is becoming a well-established technology at semiconductor foundries, making HEP applications possible....
In a class of theories, dark matter is explained by postulating the existence of a dark sector',
which interacts gravitationally with ordinary matter. If this dark sector contains a U(1) symmetry,
and a correspondingdark' photon ($A_{D}$) , it is natural to expect that this particle kineticly mix
with the ordinary photon, and hence become a `portal' through which the dark sector can be...
We report on the NAPA (Nanosecond timing Pixel for large Area sensors) detector program—comprising prototype chips NAPA‑p1 and NAPA‑p2—designed for future e⁺e⁻ colliders. We will report on the test results of NAPA‑p1, fabricated in 65 nm CMOS with a 1.5 mm × 1.5 mm footprint and 25 µm pitch as well as the new design of NAPA‑p2. To achieve an improvement in timing resolution and power...
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Future e$^+$e$^-$ colliders provide a unique opportunity for long-lived particle (LLP) searches. We present a full simulation study of LLP searches using the International Large Detector (ILD), where a gaseous time projection chamber as the main tracking device provides excellent prospects for LLP searches. Signatures of displaced vertices and kinked tracks are explored. We study challenging...
The Gas Electron Multiplier (GEM) introduced first time at CERN leverages gas ionization to produce electron ion pair for particle detection It is used in the CMS experiment at the LHC to improve muon detection in the forward region, where high precision and radiation resistance are required. We present the assembly and quality control (QC) tests of GEM detector modules carried out at Panjab...
The development of cutting-edge technologies has spurred the exploration of a pulsed solenoid as an effective optical matching
device for future positron sources. A prototype has been manufactured,
and the magnetic field distribution will soon be characterized through dedicated measurements. On the base of this design,
a specialized simulation code enabling Bayesian optimization of a...
The performance of monolithic CMOS pixel sensors strongly depends on the fabrication process,
particularly on the feature size, which directly impacts the achievable pixel pitch.
A consortium led by the CERN EP R&D program, the ALICE experiment,
and various European projects (AIDAinnova, EURIZON) is investigating
the benefits of a 65 nm CMOS imaging process to design a new generation
of...
We propose a novel method for generating highly spin-polarized positron beams through nonlinear Breit-Wheeler processes during the interaction of an ultraintense laser pulse with an electron beam.
Due to the large QCD background, tt spectroscopy is poorly doing at LHC with the exception of a toponium candidate first observed with high statistical significance by CMS. Our previous work predicts a contribution at almost the same mass from a Kaluza Klein graviton T376. For heavy scalars, following ATLAS and CMS, we describe how the top loop contribution to the gluon-gluon fusion mechanisms...
The Circular Electron Positron Collider (CEPC) was proposed as a Higgs and Z operation in Chinese High Energy Physics community, and the accelerator Technology Design Report (TDR) has been released in the end of 2023. The baseline detector design features a high-precision (approximately 100 $\mu m$) spatial resolution Time Projection Chamber (TPC) as the main tracking device surround a 3.0T...
Same as #48 https://agenda.linearcollider.org/event/10594/manage/abstracts/541/
High-energy $\gamma\gamma$- and $e\gamma$-collisions offer a rich phenomenological programme, complementary to $e^+e^-$ collisions at a linear collider both in kinematic as well as physics reaches. In particular, $\gamma\gamma$ collisions offer a unique setting to investigate properties of the Higgs boson(s). High polarisation of the photon beams (produced via Compton back-scattering) can be...
A read-out system, comprising a local oscillator (LO) and down-conversion electronics [1], was developed to process the signals from a cavity beam-position monitor (cBPM) installed at the end of the Accelerator Test Facility (ATF) linac at KEK, Japan. The cBPM [2] operates with a dipole mode signal centered at 1.725 GHz, which must be down-converted to a lower frequency suitable for digital...
Invited poster, Innova initiative from UPV.
https://innova-physics-upv.github.io/
Charged particles traveling through carbon-based nanostructures may excite electromagnetic modes (plasmonic modes) due to the collective excitation of the electron gas confined in their surfaces. This effect has recently been proposed as a potential candidate to accelerate particles with ultra-high accelerating gradients. Such plasmonic excitations can be investigated through both...
Highly compact and granular electromagnetic calorimeters are necessary for luminometers in experiments at electron-positron colliders or for the measurement of the positron multiplicity and energy distribution in the laser-electron scattering experiment LUXE investigating strong field QED. In the former, Bhabha scattering is used as a gauge process. Using a highly compact calorimeter, i.e....
We explore the real-singlet extension of the Standard Model without a Z2 symmetry (RxSM) as a framework to address the baryon asymmetry of the Universe and investigate modifications to the Higgs potential. First, we identify regions of parameter space that allow a Strong First-Order Electroweak Phase Transition (SFOEWPT) using the public tool BSMPTv3, while incorporating relevant theoretical...
This contribution presents the design and preliminary validation of a modular Low-Level Radio Frequency (LLRF) acquisition and control system specifically tailored for the low energy linear ion injector being developed at IFIC, operating around 750 MHz.
The system adopts a MicroTCA (uTCA) platform integrating high-speed Advanced Mezzanine Cards (AMC) for RF signal generation, conditioning,...
In this poster, I will analyze the potential signatures of a first-order electroweak phase transition in the early Universe. Since the Standard Model does not allow for such a transition, I will explore a simple extension of the scalar sector—the Two Higgs Doublet Model (2HDM)—which introduces a second Higgs doublet.
If the phase transition is strong enough, it proceeds via the spontaneous...
The selection of the ILC Kitakami Highlands as a candidate site was based on its favorable geological, topographical, and natural environment. The Tohoku ILC Project Promotion Center is taking the lead in studying the measures necessary to improve the sustainability of the ILC site in the region.
In this context, we propose a decarbonization initiative through the active use of five types of...
Poster version of abstract #100 https://agenda.linearcollider.org/event/10594/abstracts/593/
Measurements at electron-positron colliders can probe the scale evolution of quark masses predicted by the Standard Model in several ways. LEP and SLD extracted mb(mZ) from three jet rates in Z->bbbar decay. A future Z-pole run can improve the precision considerably, while a measurement of mb at higher scale is possible from e+e- -> bbbar production at 250 GeV and above. A very precise...
Over the past five years, our team of the AITANA group has been working on bringing a new expertise and research lines to IFIC, bringing fresh expertise on detector instrumentation in an area never explored by IFIC (high-granular silicon calorimetry) but key in the future detector instrumentation of lepton colliders and other experiments as the LUXE. This has positioned IFIC as a leading...
Correlations in the angular distribution of particle pairs over large separations can act as sensitive probes of phenomena beyond the Standard Model, such as those predicted in Hidden Valley (HV) frameworks. In this work, a scenario involving a hidden sector with QCD-like dynamics is investigated, where the interplay between HV radiation and standard partonic cascades could intensify and...
Status and progress of e-driven positron source for ILC in KEK will be reported.
Since the ILC cannot reuse beams, it is necessary to generate a large number of particles, 31 mC/sec. In Electron-driven positron sources, it is important to find efficient generation conditions because the target load becomes large. We simulated the process in which an electron beam is injected into a W-Re target, the generated positrons are captured and accelerated by RF, and then collected...
RF pulse modulation techniques are widely applied to shape RF pulses for various types of RF stations of particle accelerators. The amplitude and phase modulations are typically implemented with additional RF components that require drive or control electronics. For the RF system-on-chip (RFSoC) based generation LLRF (NG-LLRF) platform we developed in the last several years, the RF modulations...
Talk requested to ATLAS
The Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, with steel as absorber and plastic scintillators as active medium. The scintillators are read-out by the wavelength shifting fibres coupled to the photomultiplier tubes (PMTs). The analogue signals from the PMTs are amplified, shaped, digitized by sampling the signal every 25...
An update on the design and build progress for the QCM, which comprises a liquid nitrogen cryovessel housing a copper accelerating structure and its requisite supports and alignment monitoring systems. Design progress, build progress, and initial test results will be shared.
The Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, with steel as absorber and plastic scintillators as active medium. The High-Luminosity phase of LHC, delivering 5 to 7.5 times the LHC nominal instantaneous luminosity, is expected to begin in 2030. TileCal will require new electronics to meet the requirements of a 1 MHz...
The high-luminosity circular collider FCC-ee will need a low-emittance positron beam with high enough intensity to shorten the injection time. In particular, operation at the Z-pole demands a positron bunch intensity of 2.14e10 particles at injection into the collider rings. The baseline design for positron production relies on a conventional source, where a 2.86 GeV electron beam impinges on...
We report the performance of the CALICE scintillator electromagnetic calorimeter (Sc-ECAL) large prototype measured with 0.5–5.8 GeV electrons at KEK in May–June 2025. Because the calibration LEDs were not operational, we determined single-photo-electron (SPE) gains directly from MIP-like spectra using a frequency/peak-finding method. The calibration chain includes channel-by-channel pedestal...
The trilinear Higgs coupling offers a unique opportunity to probe the structure of the Higgs sector and study the nature of the electroweak phase transition. It constitutes a “holy grail” for Particle Physics and is a crucial target for future experiments.
Recently, it was also shown that confronting the prediction for the trilinear Higgs coupling with the latest experimental bounds opens a...
For $C^3$, some 3000 accelerator sub units must be positioned, within 10 um transversal, on a 6 km long straight line. In the Rasnik alignment system, light from a point-like monochromatic source falls on a zone plate, forming a Fraunhofer diffraction pattern on an image pixel sensor. The alignment of three objects can be obtained by analysing the position of the diffraction pattern on the...
A high-yield positron source is essential for FCC-ee, which requires low-emittance beams with sufficient intensity for rapid injection. At the Z-pole, positron bunches of 2.14×10¹⁰ particles (5 nC) are needed, with a safety margin corresponding to 12.8 nC at the damping ring (DR). The positron source employs 2.86 GeV electrons striking a 15 mm tungsten target, with capture provided by a...
The precise determination of the Higgs self-couplings is an essential task for understanding electroweak symmetry breaking and probing physics beyond the Standard Model (SM). The calculation of two-loop corrections is important to provide a critical test of the perturbative stability, especially in the case of large one-loop corrections that can occur in scenarios with extended scalar sectors....
The future Higgs Factory collider will provide unprecedented precision to significantly sharpen measurements and understanding of the Higgs boson. An attractive capability could come from using monolithic active pixel sensors (MAPS). A MAPS prototype program is developing sensors with tracking performance as first priority; implementation for the electromagnetic calorimeter (ECal) is a...
The two popular frameworks for the effective field theory (EFT) describing physics beyond the standard model are the Standard Model EFT (SMEFT) and the Higgs EFT (HEFT). In this work, we present another framework, called broken phase effective field theory (bEFT), in which we deal directly with mass eigenstate fields after spontaneous symmetry breaking without employing nonlinear realization....
The Super Tau-Charm Facility (STCF) is a next-generation electron-positron collider currently under development in China. To meet its high-luminosity requirement, a high-current positron source is essential. In order to enhance the positron yield, we have optimized the magnetic field configuration of the flux concentrator, redesigned the geometry of the target cone, and modified the short...
The high-granularity Silicon-Tungsten Electromagnetic Calorimeter (SiW-ECAL) was proposed as early as around the year 2000. The project is completing its technological prototype phase, and is now advancing toward an engineering prototype, in preparation for any future electron-positron collider.
Building upon insights from previous studies considering recent advancements in electronics and...
We explore the real-singlet extension of the Standard Model without a Z2 symmetry (RxSM) as a framework to address the baryon asymmetry of the Universe and investigate modifications to the Higgs potential. First, we identify regions of parameter space that allow a Strong First-Order Electroweak Phase Transition (SFOEWPT) using the public tool BSMPTv3, while incorporating relevant theoretical...
The Higgs sector is a fundamental area to search for additional sources of CP violation beyond the Standard Model (SM), which are required to explain the baryon asymmetry observed in our universe. In the SM, the Higgs boson is a CP-even scalar with CP-conserving couplings. Analysing Higgs-boson couplings for deviations from their expected behavior provides a direct way to probe CP violation...
For future $e^{+}e^{-}$ Higgs factories two processes have been proposed for precision integrated luminosity measurements, Bhabha scattering and diphoton ($\gamma\gamma$) production. To address some proposals aiming for $10^{-4}$ or even $10^{-5}$ precision on integrated luminosity, two studies were conducted. The first study, summarized in this talk, focused on upgrading the existing...
A baseline concept for a continuous wave (CW) polarized positron injector was developed for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab. This concept is based on the generation of CW longitudinally polarized positrons by a high-current, polarized electron beam (1 mA, 130-370 MeV, and 90% longitudinal polarization) that passes through a rotating, water-cooled,...
Highly compact and granular electromagnetic calorimeters are necessary for luminometers in experiments at electron-positron colliders or for the measurement of the positron multiplicity and energy distribution in the laser-electron scattering experiment LUXE investigating strong field QED. In the former, Bhabha scattering is used as a gauge process. Using a highly compact calorimeter, i.e....
The push to create a high luminosity Higgs factory requires the generation and preservation of low emittance beams. In this new low emittance regime, collective effects previously considered negligible must be re-examined, such as intrabeam scattering, which leads to the increase of the sliced energy spread. Omitting intrabeam scattering in our simulations may result in unrealistically high...
The ESRF mid-term plan for the upgrade of the injection complex foresees a full energy linac option. Given the space limitations of the site, compactness is a strong design constraint and high gradient technology is a potential candidate to fulfill this goal. Beam dynamics simulations have been performed for several different accelerating structures in the S-, C- and X-band frequencies to...
talk requested from ATLAS by Arantxa Ruiz, speaker selected by the Speakers Commitee, information available on https://atlas-glance.cern.ch/atlas/speakers/publicglance/talksbyconference
The Cool Copper Collider (C3) is a proposed electron-positron linear-collider Higgs factory which leverages the high accelerating gradient achieved when a normal conducting copper cavity is cryogenically cooled with liquid nitrogen. To produce suitably short, flat, low emittance electron and positron beams, prior to the main Linac, a damping ring and bunch compressor are employed. In this...
We introduce the Azimuthal Modulation Method (AMM), a technique for precisely sculpting the electromagnetic fields in RF cavities to enable multipole-free acceleration or bespoke transverse kicking. The AMM provides fine control over multipolar field components, allowing suppression of unwanted multipoles (such as those arising from ancillary elements like single-slot power couplers) or the...
We study the process $l^−l^+→ν\bar{ν}Zh$, whose cross section exceeds that of $l^−l^+→Zh$ above the TeV scale. The amplitudes are classified into three topologies: vector boson scattering (VBS), $W^−l^+$ scattering, and $l^−W^+$ scattering. We analyze their interference patterns and show that the gauge cancellation observed in the unitary gauge at high energies does not appear in the recently...
In this talk, we aim to summarize recent simulation studies on the exploitation of silicon-tungsten high-granular calorimeter concepts in Dark Matter and direct searches for new particles in novel experiments. These concepts have been tailored for collider physics, specifically Higgs Factories and the LHC. However, the intrinsic capabilities of these designs, which aim for a low Molière radius...
Laser-driven Compton backscattering (CBS) has been proposed as method for controlling the intensity of colliding bunches in the FCC-ee so as to avoid the flip-flop instability. Laser-based collimation has also been proposed as an indestructible collimator for high-intensity electron beams, which could significantly reduce the length of a Linear Collider Beam Delivery System. We have initiated...
Electron linear accelerators are compact and energy-efficient drivers for moderate neutron production, making them attractive for research, medical, and industrial applications. We present a preliminary beam-dynamics design of an X-band accelerator capable of delivering an electron beam with a mean final energy of 509 MeV. The design prioritizes stable, high-intensity operation, achieving an...
The Higgs mechanism is essential for the success of the Standard Model (SM) and can be experimentally verified with a determination of the Higgs self-coupling. As the simplest model of a Higgs potential, the SM provides a clear prediction of the Higgs self-coupling in terms of the Higgs mass and the vacuum expectation value. Any deviations would indicate physics beyond the SM and help guide...
Jet flavour identification plays a central role in unlocking the full physics potential of the Future Circular Collider (FCC). In particular, flavour tagging is essential for the FCC-ee Higgs programme, where hadronic decays dominate. The ability to efficiently distinguish between b-, c-, s-, and gluon jets enables the study of rare Higgs decay modes that remain inaccessible at the LHC,...
Jet flavor tagging for linear Higgs factories (ILC, CLIC) has long been done with BDT-based algorithm. Stimulated from recent improvements in LHC experiments, the update has been done with DNN-based algorithm, namely Particle Transformer (ParT). It already shows great improvement of around factor 10 in background rejection for b and c tagging. It also enables to do strange tagging as well as...
Dielectric laser acceleration (DLA) applies well-known concepts of structure-based accelerators at a microscopic length scale by driving dielectric structures with strong infrared femtosecond laser pulses [1]. In DLA, the optical electro-magnetic fields take the role of the microwave fields, and the transparent dielectric structures shape the field, similar to the microwave structures in RF...
A photon-photon collider presents outstanding physics opportunities that complement and extend the capabilities of a linear e+e- collider. This is due to three key defining features: i) the Higgs boson is produced in the s-channel, in contrast to e+e- where an additional Z boson has to be produced, ii) photons allow for full control of the polarization of the initial state, enabling a rich...
Jet flavour tagging is crucial in experimental high-energy physics. A tagging algorithm, DeepJetTransformer, is presented, which exploits a transformer-based neural network that is substantially faster to train.
The DeepJetTransformer network uses information from particle flow-style objects and secondary vertex reconstruction, as is standard for $b$- and $c$-jet identification,...
Solid-state plasma wakefield acceleration has recently attracted attention as a novel method for achieving unprecedented ultra-high acceleration gradients on the order of 1 TV/m or beyond. In this context, recent advancements in nanofabrication techniques have opened up the possibility of creating structured plasmas with tailored properties. For instance, the utilization of carbon nanotube...
High-energy $\gamma\gamma$- and $e\gamma$-collisions offer a rich phenomenological programme, complementary to $e^+e^-$ collisions at a linear collider both in kinematic as well as physics reaches. In particular, $\gamma\gamma$ collisions offer a unique setting to investigate properties of the Higgs boson(s). High polarisation of the photon beams (produced via Compton back-scattering) can be...
We report on a new flavor tagging algorithm developed to determine the quark-flavor content of bottom mesons at Belle II. Our new end-to-end algorithm, TFlat, uses transformer blocks to predict the flavor of neutral mesons produced in decays. It improves previous algorithms by using the information from all charged and neutral final-state particles. In contrast to previous algorithms, TFlat...
There have been numerous attempts to ascribe crucial roles to vector-like leptons in alleviating various shortcomings of the Standard Model through their Yukawa interactions with the Standard Model Higgs and leptons. These interactions can lead to sizable di-Higgs production at lepton colliders, otherwise small in the Standard Model, while remaining consistent with electroweak precision data,...
Future high-luminosity electron–positron colliders such as the CEPC and FCC-ee, with a circumference of around100 km, will produce predominantly hadronic events, offering a rich environment to study jet physics.
A central focus of this work is jet origin identification (JOI), a general framework extending beyond traditional jet flavor tagging. JOI distinguishes among 11 categories, including...
Current hadron accelerators can deliver energies far beyond those of lepton acceleration schemes, but this energy is divided among the partons. Plasma wakefield acceleration offers a method to transfer energy from a drive beam to a witness, allowing existing proton accelerators to be transformed into lepton machines. Relatively little civil engineering would be required due to the high...
Strong-field quantum electrodynamics offers a unique window into non-perturbative phenomena such as vacuum pair production, where electron-positron pairs emerge from intense electromagnetic fields. The LUXE experiment at DESY will soon probe this regime using collisions between a high-intensity laser and the 16.5 GeV electron beam of the European XFEL. Future accelerator infrastructures, such...
The KEK ATF facility is Accelerator Test Facility devoted to develop beam instrumentation technologies for International Linear Collider (ILC) project. The Accelerator Test Facility Low-level RF (LLRF) and timing systems are vital systems to operate and synchronize pulsed accelerators. KEK ATF facility timing system supplies trigger and gate signals for DAQ, klystrons, laser systems,...
The performances of a silicon tungsten electromagnetic calorimeter for flavour physics has been studied. The study uses a fast simulation, with a geometry of the detector taken from ILD. This fast simulation is based on timing algorithm for the photon reconstruction which is planed to be presented in another talk at LCWS. When possible, a 1-C fit of the pi0 mass is used. The paradigm about...
Future Higgs Factories will offer a clean environment to study $e^{+}e^{-} \rightarrow q\bar{q}$ processes ($q = s, c, b, t$) at various centre-of-mass energies, from the Z-pole up to the TeV scale. In this contribution, we focus on the case of $e^{+}e^{-} \rightarrow s\bar{s}$ at $\sqrt{s} = 250$ GeV, using full simulation and reconstruction within the ILD detector concept to evaluate...
Simulating entire beamlines for future linear colliders remains a significant challenge due to the diversity of components and the wide range of physical effects that must be accurately modelled. This is particularly true for colliders based on advanced accelerator concepts such as plasma acceleration. The Adaptable Beginning-to-End Linac (ABEL) simulation framework employs a modular...
The KEK ATF (Accelerator Test Facility) serves as a dedicated testbed for developing beam instrumentation technologies in support of the International Linear Collider (ILC) project. As such, it incorporates a variety of diagnostic tools based on laser systems and photodetection technologies. At the ATF, nanometer-scale beam (nanobeam) technology development is underway using the Final Focus...
Plasma-wakefield acceleration holds great promise for particle physics due to its orders-of-magnitude higher accelerating gradients, which can result in significant cost reductions based on a sizeable reduction in footprint. However, plasma-based acceleration of positrons—required for an electron-positron collider—is much more difficult than for electrons. In 2023 a novel collider scheme,...
The coupling of the Higgs boson to first and second generation fermions has yet to be measured experimentally. There still could be very large deviations in these couplings, as the origin of flavor is completely unknown. Nevertheless, if Yukawa couplings are modified, especially for light generations, there are generically strong constraints from flavor-changing neutral currents (FCNCs). ...
The Laser Und XFEL Experiment (LUXE), in planning at DESY Hamburg, is intended to study quantum electrodynamics (QED) in strong electromagnetic fields, and in particular the transition from perturbative to non-perturbative. In the non-perturbative regime, electron-positron pairs tunnel out of the vacuum in a manner akin to the Schwinger process. The experiment will make precision measurements...
In order to achieve laser pulse to electron beam arrival time with sub-
picosecond stability at the accelerator facilities, a new Low-Level Radio-
Frequency system is currently under investigation in collaboration between KEK
(Japan) and IJClab (France). This clock generators synchronization architecture is
based on 10 MHz frequency generator (Stanford Research System), White...
Quantum entanglement and Bell inequality violations—cornerstones of quantum mechanics—have traditionally been investigated in low-energy experimental settings. Recently, these fundamental phenomena have begun to be explored in the high-energy domain of particle physics, where colliders offer a powerful new platform for studying quantum correlations. In this talk, we discuss how colliders can...
Our work resolves a long-standing problem in particle physics: the inability for theory to agree with the spectrum of heavy-jet mass data, particularly at the Z-pole, leading to unreliable strong-coupling fits and exclusion of this high-quality experimental data. Our key theoretical improvements include high-precision large-log resummation in both the dijet and shoulder regions, a rigorous...
Recent experiments in short-pulse structure-wakefield acceleration (SWFA) have shown that nanosecond-scale RF drive pulses can sustain unprecedented gradients while mitigating breakdown probability compared with conventional long-pulse operation. Building on studies at the Argonne Wakefield Accelerator (AWA), we report results on high-gradient performance, RF breakdown behavior, and dark...
In the framework of developing a high-resolution cavity beam position monitor (cBPM) and data acquisition (DAQ) system for future linear colliders, a re-entrant cBPM designed at CEA Saclay [1] was tested at the end of the LINAC at the Accelerator Test Facility (ATF), KEK. Position and reference signals are extracted from the same BPM and processed identically. The signals at 1.725 GHz (dipole...
The Accelerator Test Facility (ATF) at KEK serves as a prototype for the Final Focus Systems envisioned for future electron–positron linear colliders, including the International Linear Collider (ILC) and the Compact Linear Collider (CLIC). To enable both advanced RF-Track simulations and corrections of unwanted effects with a unified approach, a Python-based “Flight Simulator” was developed...
Measurements at electron-positron colliders can probe the scale evolution of quark masses predicted by the Standard Model in several ways. LEP and SLD extracted mb(mZ) from three jet rates in Z->bbbar decay. A future Z-pole run can improve the precision considerably, while a measurement of mb at higher scale is possible from e+e- -> bbbar production at 250 GeV and above. A very precise...
The measurement of Higgs coupling constants is one of the most important goals for Higgs factories. While the couplings of the Higgs boson to the top and bottom quarks have been experimentally confirmed, the coupling to the strange quark has not yet been observed due to its extremely small decay branching ratio.
We evaluated the measurement accuracy of the Higgs coupling to the strange quark...
The International Linear Collider (ILC) is a proposed electron–positron collider envisioned for the post-LHC era. Its Beam Delivery System (BDS) transports the beam from the main linac and focuses it to nanometer-scale dimensions at the Interaction Point (IP). Along this path, the beam passes through collimators, diagnostic instruments, and strong magnetic elements. Intensity-dependent effects...
The production of heavy-quark jets is accompanied by gluon bremsstrahlung. This radiation is suppressed at small angles and is proportional to the heavy-quark mass, a phenomenon known as the dead cone effect. In this talk, we present this effect for charm and bottom quark initiated jets using data from Z-boson decays in momentum space in the e+e− annihilation. The observed suppression is...
A new Beam Delivery System (BDS) has been developed for the 1.5 TeV stage of the Compact Linear Collider (CLIC). While the original 3 TeV BDS design was previously considered adequate for operation at 1.5 TeV, the revised design takes advantage of the reduced synchrotron radiation (SR) at lower energy. The reduced SR permits the use of stronger bending dipoles and consequently weaker...
ATLAS speakers committee to provide a speaker (the contribution is currently circulating in the collaboration)
The EuPRAXIA@SPARC_LAB facility is the beam-driven pillar of the EuPRAXIA project, which aims to establish by the end of 2031 the first European Research Infrastructure dedicated to plasma-based accelerators. The facility is expected to demonstrate the usability of such accelerators to deliver high-brightness electron beams in the 1–5 GeV range for a broad user community.
One of the primary...
Accurate, fully differential predictions are essential for precise experimental analyses at linear colliders, and are typically delivered by parton-shower Monte Carlo programs. Last year, the event generator Sherpa has been released in a new version (3.0), with an emphasis on incorporating higher-order electroweak and QCD effects. We will summarise its new features, particularly those relevant...
We report on current developments and future plans for the Whizard Monte-Carlo generator framework: On the physics part, we focus on recent progress and applications of the NLO EW automation, both for SM and BSM models, as well as the effective vector boson approxomation and EW PDFs for EW interactions at the higest energies. On the technological part, we comment on the current status of the...
We hypothesize that third- and higher-order treatment of particle optics have a minor impact on the beam size at the interaction point (IP)
and on the resulting luminosity, compared to linear and second-order contributions.
To test this, we are conducting a comprehensive simulation campaign using PLACET, GuineaPig, and MAPCLASS to quantify the correlation
between IP beam size and luminosity...
Future electron–positron Higgs/Top/Electroweak factories will require Monte Carlo event generation at the same level of precision as the experimental measurements. Since several generators can provide predictions of comparable accuracy, it is essential to compare them consistently to identify deviations and evaluate systematic uncertainties arising from the event generation stage.
We give an...
As interest in advanced acceleration techniques for future high-energy colliders continues to grow, there is increasing demand for Beam Delivery Systems (BDS) capable of transporting beams with energies beyond the CLIC design. While plasma-based collider concepts offer the potential for significantly reduced accelerator footprints, the BDS is expected to dominate the overall facility length at...
The Ghost Collider is an innovative proposal for a 550 GeV center-of-mass, 275 GeV per beam linear collider with four interaction regions, each with the design luminosity. The primary innovation is the use of “ghost bunches” containing equal numbers of electrons and positrons so they are electrically neutral. In the linacs, energy is transferred between electrons and positrons in the same...
The Key4hep software ecosystem provides a common software stack for studying the physics potential at future collider facilities. It provides all the necessary tools for physics studies ranging from event generation and detector simulation to reconstruction and analysis. The shared effort of several communities, including ILC, CLIC, FCC and CEPC, have made Key4hep the de-facto standard for...
Measuring the Higgs potential represents one of the main goals of the physics programs of future colliders. At center-of-mass energies of $\sqrt{s} \geq 500 \mathrm{GeV}$, direct access to the self-coupling $\lambda$ is enabled through the ZHH process. The ongoing update of the ILD ZHH analysis focuses on the final state $HH \rightarrow b\bar{b}b\bar{b}$. In our contribution, we discuss recent...
Recent LHC results have demonstrated the possibility to demonstrate that in certain kinematic regions top quark pairs are produced in as an entangled two-qubit system. Spin correlation measurements in top quark pair production at a high-energy linear collider can study a highly entangled quark-anti-quark system in a cleaner and more inclusive fashion, while beam polarization allows for some...
In this talk I will describe a concept of $e^+e^-$ linear collider recycling both the used particles and the used beam energy – the ReLiC. The concept is based on segmenting superconducting (SRF) linear accelerators into sections divided by separators, where used decelerating) beams are separated from colliding with accelerating beams by a combination of DC electric and magnetic fields. This...
This work presents a first design study of the Beam Delivery System (BDS) for the Hybrid Asymmetric Linear Higgs Factory (HALHF); a novel electron-positron collider concept based on a combination of RF- and plasma-accelerator technology, targeting precision Higgs physics. Due to the highly asymmetric nature of the electron and positron bunches, HALHF operates with significantly larger...
One current focus point of calorimeter reconstruction algorithm developments has been the utilisation of time information as the fifth dimension of calorimeter data.
In this talk, recent work from the CALO5D team is presented, which studies timing in the highly granular CALICE-type calorimeter. While we study this calorimeter concept as implemented in the International Large Detector (ILD)...
We present updated constraints on the top-quark sector of the Standard Model Effective Field Theory using data from Tevatron, LEP, and the LHC. Our global fit yields bounds for Wilson coefficients across various two-fermion, four-quark, and two-quark two-lepton operators. We assess these current bounds in relation to the prospects of the high luminosity phase of the Large Hadron Collider and...
EuPRAXIA@SPARC_LAB will be the first European research infrastructure designed to demonstrate plasma-based acceleration, combining a high-brightness GeV-class electron beam with a state-of-the-art X-band linac and a 0.5 PW-class laser system. The success of this facility critically depends on the preservation of beam quality during acceleration, as wakefields and structural misalignments in...
This work presents a preliminary attempt to extend the Particle Flow Algorithm (PFA) APRIL by incorporating time information into its reconstruction framework. The goal is to improve cluster energy purity and efficiency, finally the overall Particle Flow Object (PFO) reconstruction quality.
Our main modification is to change the seeding based on timing information and the check the time...
RF-Track is a high-performance particle tracking for the simulation and optimisation of particle accelerators. It supports beams with arbitrary energy, mass, charge, and spin polarisation, and is particularly suited to high-intensity injectors and linacs, positron sources, photoinjectors, medical accelerators, inverse Compton scattering sources, and unconventional systems such as the cooling...
The CLIC study has developed compact, high-gradient, and energy efficient acceleration units as foundational components for a future high-energy electron linear collider. Broader research initiatives have also deepened the understanding of accelerating structure breakdown phenomena, unlocking reliable operation of high-gradient structures across a range of frequency bands. With the CLIC R&D...
In the last decades there has been a bunch of exciting progress in hadron LINACs, and AVS has been part of the developments under different hats. In this talk, AVS will focus in recent developments under public-private collaborations. Challenges come from different directions depending on the project, from extremally high currents to ultra-compact developments, from cancer treatment to...
This talk tells the story of the Spanish startup Seven Solutions—now part of Safran Electronics & Defense—and its journey from a niche player to a global leader in White Rabbit (WR), the sub-nanosecond time distribution technology born at CERN.
Originally designed to meet the demanding synchronization needs of the LHC, White Rabbit has since expanded its applications to other scientific...
The INPROCAP project aims to establish a long-term sustainable advisory platform for innovation procurement within the Big Science innovation ecosystem.
INPROCAP will embed specialized advisory services on innovation procurement amongst the national Industrial Liaison Officers (ILOs) who collaborate with prominent Big Science Organisation (BSOs), such as e.g. CERN and EuXFEL. These...
The goal of the discussed collaboration is to produce proof-of-principle 1.3 GHz single cell cavities by hydroforming the copper cavity substrate, then applying a 6 micrometer niobium layer on the inside.
The substrate forming process was optimized by the mechanical engineering section of CERN and KEK then they were produced by an industrial partner in Japan. Later the niobium layer was...
By 2045 the LHCb upgrade 2 and the Belle 2 programmes will have been completed. What remains to be done after that? How much can a linear collider contribute, and for what is a giga-Z run needed? This contribution is based on the work of the ESPPU PPG flavour working group and aims at putting the linear collider flavour programme in context.
The Petra accelerator at DESY, in user operation for photon science experiments
since 2009, is one of the world-best synchrotron radiation sources.
Its experiment Control System is based on Tango, for hardware access and
transport layer, and Sardana for the user interfaces, including scripting,
and command line and graphical interfaces.
During these years of operation the control system...
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The International Linear Collider (ILC), with its technologically mature accelerator and detector designs and well-understood physics program, represents a realistic candidate for a future Higgs factory. Its staged energy program, the use of polarized beams, and the capability to reach center-of-mass energies up to 1 TeV offer unique sensitivity to deviations from Standard Model predictions in...
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