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LHC Higgs Working Group WG3 (BSM) -- Extended Higgs Sector subgroup meeting
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Europe/Zurich
Alexandra Carvalho Antunes De Oliveira
(Peking University (CN)),
Khawla Jaffel
(National Institute of Chemical Physics and Biophysics (EE)),
Lidija Zivkovic
(Institute of physics Belgrade (RS)),
Nikolaos Rompotis
(University of Liverpool (UK)),
THOMAS Biekötter
(IFT Madrid),
Tania Robens
(IRB Zagreb)
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14:30
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14:50
Emerging Jets from extended Higgs sectors 20m
Emerging jets are long-lived mesons from a new confining dark sector (DS) that decay into Standard Model (SM) particles. The mediator between the DS and the SM is often taken to be a new scalar charged under both QCD and the new strong dark force, hence LHC searches set bounds on the mediator mass in the few TeV range.
In this talk we explore the possibility that instead, the mediators is the heavy scalar from the real singlet scalar extension of the Standard Model. We show the interplay between the direct searches for emerging jets and the bounds from scalar searches (both for scalar resonances and di-Higgs final state). We also propose a novel strategy for EJs to increase the coverage of the parameter space.
Speakers: Jose Zurita (Valencia U., IFIC), Dr José Francisco Zurita (IFIC, CSIC‐UV) -
15:00
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15:20
Precise trilinear couplings and gg->hh in any renormalisable theory 20m
We introduce the framework anyH3 which allows to compute
trilinear scalar couplings at the full one-loop level in arbitrary
renormalisable QFTs as well as its extension, anyHH, providing fully differential
predictions for gg->h_ih_j. anyHH incorporates corrections proportional to
Higgs-BSM couplings at next-to-leading order to the resonant part of the
process. I will show that such corrections are crucial in BSM scenarios that
feature an SM-like Higgs boson in exact or near alignment to the SM Higgs.
Finally, the importance of a proper treatment for the interference between resonant
and non-resonant parts of the cross-section is discussed.Speaker: Martin Gabelmann (U. Freiburg) -
15:30
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15:50
Strong First-Order One- and Multi-Step Phase Transitions in the CP-Conserving 2HDM 20m
Extended scalar sectors can significantly influence the cosmological evolution of the early universe. The additional scalar degrees of freedom allow for strong first-order phase transitions (SFOPT) into the electroweak-broken vacuum, which induce gravitational waves that, for sufficiently strong signals, might be detectable in the near future. Additionally, the universe might have undergone intermediate phases via a multi-step phase transition, which could potentially be distinguishable from simple one-step phase transitions via collider phenomenology.
In this talk, the parameter space of the CP-conserving 2-Higgs-Doublet Model is investigated with the recent version 3 of the public code BSMPT. Within this model, we study the viability of SFOPTs in light of the recent experimental constraints from Higgs measurements and exotic Higgs searches. We present parameter regions involving different one- and multi-step phase histories, and study their features such as the size of the trilinear Higgs couplings as well as the strength of their gravitational wave signals.Speaker: Dr Christoph Borschensky (Karlsruhe Institute of Technology) -
16:00
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16:20
Dark Matter in the General 2HDM with Extra Top Yukawa Couplings 20m
The nature of dark matter remains one of the most compelling open questions in particle physics. While Higgs-portal models provide a simple connection between the Standard Model and the dark sector, they are increasingly constrained by cosmological observations and collider searches. In this talk, I will present an extension of the general two Higgs doublet model with an additional real scalar singlet, providing a well-motivated ultraviolet completion of top-window dark matter scenarios in which the dark matter particle interacts predominantly through the top quark.
I will discuss how the interplay between the extended Higgs sector, extra Yukawa interactions, and the singlet portal shapes both the cosmological and collider phenomenology of the model. After imposing constraints from Higgs measurements, direct searches for additional Higgs bosons, the observed dark matter relic abundance, and direct and indirect detection experiments, a rich parameter space remains with distinctive signatures at the LHC. In particular, I will highlight benchmark scenarios that probe singlet-portal, bosonic-cascade, fermiophilic, and flavor-violating regimes. A striking feature of the model is the flavor-violating production process (cg \to tH), mediated by a top-charm Yukawa coupling, where the associated top quark provides a powerful handle to search for otherwise invisible heavy Higgs decays into dark matter. These signatures offer new opportunities to explore the connection between flavor physics, extended Higgs sectors, and the dark sector at current and future collider experiments.Speaker: Leon Manuel Garcia (Sonora U.)
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14:30
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14:50