Conveners
BSM, Global Interpretations: 1
- Aleksander Filip Zarnecki (University of Warsaw)
BSM, Global Interpretations: 2
- Sven Heinemeyer (Consejo Superior de Investigaciones Cientificas (CSIC) (ES))
BSM, Global Interpretations: 3
- Aleksander Filip Zarnecki (University of Warsaw)
BSM, Global Interpretations: 4
- mihoko nojiri
BSM, Global Interpretations: joint with HiggsEW
- Sven Heinemeyer (Consejo Superior de Investigaciones Cientificas (CSIC) (ES))
BSM, Global Interpretations: 5
- Takuya Nobe (University of Tokyo (JP))
Despite successfully predicting the outcome of hundreds of measurements at colliders and other experiments, the standard model of particle physics cannot be the final theory of nature. Searches for beyond-the-standard model (BSM) physics are now a major component of the research program at the ATLAS and CMS experiments at the Large Hadron Collider (LHC). This talk presents highlights of BSM...
Some say SUSY is dead, because LHC has not discovered it yet. But is this
really true? It turns out that the story is more subtle. SUSY can be 'just
around the corner', even if no signs of it has been found and a closer
look is needed to quantify the impact of LHC limits and their implications
for future colliders. Here, a scan of the relevant parameter space of
(weak-scale) SUSY...
Recently ATLAS and CMS published search results in the search for SUSY particle production channel $pp \to \tilde\chi_2^0 \tilde\chi^\pm_1$ in three different final states ($3l$, $2l$ and mono-jet). All searches in both experiments show consistent (small) excesses for $m_{\tilde\chi^0_2} \approx m_{\tilde\chi^\pm_1} \approx m_{\tilde\chi^0_1} + 20$ GeV. We discuss these excesses and their...
The future e+e- colliders offer excellent facilities for SUSY searches. The stau, superpartner of the tau-lepton, is one of the most interesting particles for these searches, being likely the lightest of the sfermions, first one that could be observed, and it can be regarded as the worst and thus most general scenario for the searches.
The prospects for discovering stau-pair production at...
Exploring long-range angular correlations among emitted particles in high-energy collisions provides an opportunity to uncover physics beyond the Standard Model like Hidden Valley (HV) models.
We focus on a hidden QCD-like sector, where the interplay between HV matter and QCD partonic cascades could enhance azimuthal correlations between final-state particles. Our investigation, performed at...
The possibility of a Gamma-Gamma collider extension to the Beam
dump of the $17.5$ GeV European XFEL has been discussed before as
a first high energy collider of its sort. It would not just be to study
the concept of a gamma-gamma collider but this collider would also
be without competition in the region of $5− 12$ GeV for gamma-gamma
physics. In this range $b\bar{b}$ and $c\bar{c}$...
Over a period of time neutral BSM gauge boson is becoming important in the high energy as well as low energy experiments. In this talk we would like to present my recent works where we studied $Z^\prime$, a neutral chiral gauge boson under a general $U(1)$ extension of the Standard Model. In this scenario, there are three generations of right handed neutrinos are introduced which can generate...
Current collider experiments, such as LHC have been studying the production of the BSM particles and their decay to the Standard Model particles. These searches have placed strong constraints on different BSM models as well as on the mass of BSM particles. The situation demands to look for alternative scenarios. BSM theories such as the Pati Salam Model, Composite Higgs, and others suggest...
This talk covers recent highlights of BSM searches from the CMS experiment and future prospects at HL-LHC.
Future e$^+$e$^-$ colliders, with their clean environment and triggerless operation, offer a unique opportunity to search for long-lived particles (LLPs). Considered in this contribution are prospects for LLP searches with the International Large Detector (ILD) providing almost continuous tracking in Time Projection Chamber (TPC) as the core of its tracking systems. The ILD has been developed...
The electron-positron stage of the Future Circular Collider, FCC-ee, is a frontier factory for Higgs, top, electroweak, and flavour physics. It is designed to operate in a 100 km circular tunnel built at CERN, and will serve as the first step towards ≥ 100 TeV proton-proton collisions. In addition to an essential and unique Higgs program, it offers powerful opportunities to discover direct or...
In this talk I will review the models motivating searches for heavy neutral leptons at future e+e- colliders by linking their properties to different frameworks for neutrino mass generation and mixing. Several different regimes of prompt decays vs. long-lived HNLs vs. displaced tracks will be discussed together with their experimental signatures.
Neutrinos can be a key to solving several cosmological problems, such as the mystery of the baryon-antibaryon asymmetry in the universe or the origin of dark matter. The existence of their heavier partners, the so-called heavy neutral leptons (HNL), is a well-motivated scenario which could also contribute to explaining the mass-generation mechanism for light neutrinos. Future lepton colliders,...
In this study we investigate the feasibility of detecting heavy neutral leptons ($N_d$) through exotic Higgs decays at the proposed International Linear Collider (ILC), specifically in the channel of $e^+ e^- \to qq~ H$ with $H\to \nu N_d \to \nu~lW \to \nu l~qq$. Analyses based on full detector simulations of the ILD are performed at the center-of-mass energy of 250 GeV for two different beam...
The origins of tiny neutrino mass, dark matter and baryon asymmetry of the Universe remain big mysteries in particle physics. To explain all these phenomena, a new physics model with a Higgs sector extended at the TeV scale was proposed by Aoki, Kanemura and Seto. However, CPV phases were neglected for simplicity, and the baryon number production via electroweak baryogenesis had not been...
Many new physics scenarios render a low mass scalar candidate. I will briefly discuss the current status of such models, and give an short overview on current studies for such models at Higgs factories, including efforts within the ongoing ECFA effort.
Several searches for Higgs bosons below 125 GeV show an excess around $m_\phi = 95.4$ GeV. These include in particular $gg \to \phi \to \gamma\gamma$ at CMS and ATLAS and $e^+e^- \to Z^* \to Z (\phi \to b \bar b)$ at LEP. We discuss BSM Higgs sectors that can accommodate these excesses. We demonstrate that such a light Higgs boson can be analyzed in detail at $e^+e^-$ colliders.
In the recent years a large set of indications for BSM scalars has been observed in LHC data. After a brief description of the most significant indications, this presentation intends to give a consistent interpretation in terms of a generalised Georgi Machacek model which predicts a doubly charged scalar indicated by ATLAS data. Consequences for currently planned e+e- colliders will be...
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, production of extra light scalars is still not excluded by the existing experimental data, provided their coupling to the gauge bosons is sufficiently suppressed. Fermion couplings of such a scalar could also...
A feasibility study is conducted to search for an exotic decay of the Standard Model Higgs boson decaying into a pair of light pseudoscalar bosons in the Cool Copper Collider (C3) experiment. The Higgs boson is produced in association with a Z boson and the decay products consist of a pair of b-quarks and tau leptons. The pseudoscalar bosons are probed over a mass range spanning from 20 to 60...
We discuss the experimental prospects for measuring differential observables in b-quark and c-quark pair production at the International Linear Collider (ILC) baseline energies, 250 and 500 GeV. The study is based on full simulation and reconstruction of the International Large Detector (ILD) concept. Two gauge-Higgs unification models predicting new high-mass resonances beyond the Standard...
We present SMEFiT3.0, an updated global SMEFT analysis of Higgs, top quark, and diboson production data from the LHC complemented by electroweak precision observables (EWPOs) from LEP and SLD. We consider recent inclusive and differential measurements from the LHC Run II and estimate the impact of HL-LHC measurements on the SMEFT parameter space when added on top of SMEFiT3.0, through...
The total cross section of the process $\mu^-\mu^+\to\nu_\mu\bar{\nu}_\mu t\bar{t}H$ has strong dependence on the CP phase of the top Yukawa coupling. We study the cause of the strong energy dependence and identify its origin as the $E/m_W$ growth of the weak boson fusion subamplitudes, $W^-W^+\to t\bar{t}H$, when the two $W$’s are longitudinally polarized. We repeat the study in the SMEFT...
The standard Model (SM) is the best currently experimentally tested theory of fundamental particles and their interactions. The discovery of Higgs boson completes the particle spectrum of SM and now the particle physics have officially entered the era of precision measurement. While the SM enjoys robust experimental verification, it falls short in explaining phenomena like the naturalness...
