LHC Higgs Working Group WG2 (Higgs properties) and WG3 (BSM) -- CPV in Extended Higgs Sector topical meeting

Wednesday 5 Mar 2025, 14:00 → 17:00 Europe/Zurich

Alexandra Carvalho Antunes De Oliveira (Peking University (CN)), Daniele Barducci (Universita & INFN Pisa (IT)), Giacomo Ortona (Universita e INFN Torino (IT)), Hongtao Yang (University of Science and Technology of China (CN)), Khawla Jaffel (University of Science and Technology of China (CN)), Lidija Zivkovic (Institute of physics Belgrade (RS)), Nikolaos Rompotis (University of Liverpool (UK)), Pier Paolo Giardino, Rui Santos (ISEL and CFTC-UL), Tania Robens (IRB Zagreb), Thomas Biekoetter

14:00 → 14:30 Superposition of CP-Even and CP-Odd Higgs Resonances: Explaining the 95 GeV Excesses within a Two-Higgs Doublet Model

We propose an explanation for the observed excesses around 95 GeV in the di-photon and di-tau invariant mass distributions, as reported by the CMS collaboration at the Large Hadron Collider (LHC). These findings are complemented by a long-standing discrepancy in the $b\bar{b}$ invariant mass at the Large Electron-Positron (LEP) Collider. Additionally, the ATLAS collaboration has reported a corroborative excess in the di-photon final state within the same mass range, albeit with slightly lower significance. Our approach involves the superposition of CP-even and CP-odd Higgs bosons within the Type-III Two-Higgs Doublet Model (2HDM) to simultaneously explain these excesses at 1$\sigma$ Confidence Level (C.L.), while remaining consistent with current theoretical and experimental constraints.

Speaker: Mohammed Boukidi (Cadi Ayyad University, Marrakech)

Boukidi.pdf

14:30 → 15:00 Complex S3-symmetric 3HDM

Speaker: Anton Kunčinas (CFTP/IST, U. Lisboa)

Complex S3-3HDM.pdf

15:00 → 15:30 Distinguishing P-violation and C-violation in CP-violating extended Higgs sectors.

I will review CP-violation in 2HDMs and 3HDMs, discuss the nature of the CP-violation therein and show their experimental probes, including flavour observables, such as (g-2)_mu, undoubtable current and future collider observables, and their cosmological implications for Dark Matter, Baryogenesis and inflation.

Speaker: Dr Venus Keus (Dublin Institute for Advanced Studies (DIAS))

VKeus_PV_CV_CPV.pdf

15:30 → 16:00 Discussion