Conveners
Higgs and Electroweak Physics: Joint with BSM
- Krzysztof Mekala
Higgs and Electroweak Physics
- Arantxa Ruiz Martinez (Univ. of Valencia and CSIC (ES))
- Loukas Gouskos (Brown University)
Higgs and Electroweak Physics
- Taikan Suehara (ICEPP, The University of Tokyo)
- Johannes Braathen (DESY)
Talk requested to ATLAS
Future Electron-Positron Linear Collider Designs (ILC, CLIC, HALHF) offer high-energy, high-precision measurements and polarized beams both in e+e- as well as in gamma-gamma collisions. In the talk we discuss the impact of polarized beams for the detection of the Higgs couplings, CP-violation effects and BSM candidates in different Beyond the Standard Models (MSSM, 2HDMS, inflation models)....
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...
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 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....
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...
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
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...
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...
We investigate the potential of future electron-positron colliders, such as FCC-ee and CEPC, to probe 2-Higgs-doublet models (2HDMs) that facilitate a strong first-order electroweak phase transition (SFOEWPT), a necessary condition for electroweak baryogenesis. Focusing on a 2HDM in the CP-conserving limit, we identify parameter regions consistent with an SFOEWPT and evaluate their...
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...
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...
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,...
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...
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...
Electroweak Precision Measurements are stringent tests of the Standard Model and sensitive probes to New Physics. Accurate studies of the Z-boson couplings to the first-generation quarks, which are currently only constrained from LEP data, could reveal potential discrepancies from the theory predictions. Future colliders running at the Z-pole would be an excellent tool for an analysis based on...
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...
