Mini workshop on HHH and other extended scalar sector signatures

29 Jul 2024, 08:00 → 31 Jul 2024, 17:00 Europe/Zurich

This workshop aims at gathering both theorists and experimentalists to discuss all aspects of HHH production and other signatures stemming from extended scalar sectors. The setup is informal, but we still encourage abstract submissions. Due to ongoing constructions we cannot provide individual office space.

Depending on the number of participants, i.e. in case we need official catering, a small fee might be required to cover coffee breaks and lunches. This can only be determined at a later stage and depends on number of in person participants.

 

Group picture of local participants 30.7.24 [credit T. Susa]

Monday 29 July

13:30 → 14:00 Welcome and introduction

Speaker: Tania Natalie Robens (Rudjer Boskovic Institute (HR))

welcome.pdf

14:00 → 15:00 Multi-Higgs production and the Electroweak Phase Transition through TRSM

Exploring the Higgs sector via multi-Higgs production searches is a main goal for run-3 and high-lumi LHC. Can these searches inform us about the electroweak phase transition and matter-antimatter asymmetry?
We address this question in the context of the TRSM (Two-Real-Singlet Model), which has known benchmark points enhancing multi-Higgs production.
We update the triple-Higgs production benchmark points to include refined perturbativity bounds and explore the type of electroweak phase transition that occurs in the early universe; whether continuous or the first-order discontinuous phase transition desired for matter-antimatter asymmetry.
After presenting our work, I outline lessons on correlating the type of electroweak phase transition and the enhancement of di-Higgs or triple Higgs production, highlighting the importance of the theory's vacuum expectation value of today and the symmetries of the model.

Speaker: Osama Karkout (Nikhef National institute for subatomic physics (NL))

EWSB_HHH_Zagreb.pdf

15:30 → 16:30 Model dependent and model independent enhancement to triple Higgs production

Speaker: Gilberto Tetlalmatzi-Xolocotzi (Siegen University)

Higgs_Talk_Mini_workshop.pdf

Tuesday 30 July

11:00 → 12:00 Associate production of light scalars at the LHC [tbc]

Speaker: Aman Desai (University of Adelaide (AU))

hhh_workshop_associate_prod.pdf

14:00 → 15:00 $4b +X$ via electroweak multi-Higgs production as smoking gun signal for the Type-I 2HDM at the LHC

The existence of additional Higgs bosons, besides the one
discovered by the LHC, already a decade ago, is predicted by most
frameworks of new physics. Observation of a second Higgs boson
(charged or neutral) will thus provide a firm evidence that the
underlying manifestation of the Electroweak Symmetry Breaking (EWSB)
mechanism is a non-minimal one. The majority of analyses, both
phenomenological and experimental ones, involving additional Higgs
bosons concentrate on QCD induced production modes.
However, the QCD induced processes are not necessarily to be high in
new physics models owing to the non-standard couplings of the
new Higgs bosons to the fermions and gauge bosons. As a reference
I consider the Type-I two Higgs doublet model (2HDM) as a simple
extension of Standard Model where the Electroweak (EW) processes dominate
over the QCD processes.
I would like to discuss a full detector-level Monte Carlo analysis to establish
that the inclusive $4b+X$ final state via EW processes can provide simultaneous
reconstruction of all the additional Higgs boson masses. I will present the algorithms
for the mass reconstructions of the additional Higgs bosons.

Speaker: Dr Prasenjit Sanyal (Konkuk University)

Prasenjit_IBR_Talk_2024.pdf

15:30 → 16:30 BSM Phenomenology of Higgs Bosons in Collider Experiments

Speaker: Mohamed Ouchemhou (LHEPA)

presentation.pdf

Wednesday 31 July

11:00 → 12:00 Experimental perspective [tbc]

Speaker: Dinko Ferencek (Rudjer Boskovic Institute (HR))

20240731_Mini_workshop_on_HHH-Experimental_perspective.pdf

14:00 → 15:00 Dissecting multi-Higgs production in new physics models

Speaker: Dr Andreas Papaefstathiou (Kennesaw State University, GA, USA)

Zagreb_July2024.pdf

15:30 → 16:30 Search for a CP-even Heavy Higgs Boson in Supersymmetric B-L SM extension at the LHC

The detection of a heavy neutral CP-even Higgs boson of the $B-L$ Supersymmetric Standard Model (BLSSM), $h'$, with $m_{h'}\simeq 400~\text{GeV}$, at the Large Hadron Collider (LHC) for a center-of-mass energy of $\sqrt{s}=14~\text{TeV}$, is investigated. The following production and decay channels are considered: $gg\to h'\to{ZZ}\to4\ell$ and $gg\to h'\to{W^+W^-}\to 2\ell+\text{Missing Transverse Energy (MET))}$, where $\ell=e,\mu$, with integrated luminosity $L_{\text{int}}=300~{\text{fb}}^{-1}$ (Run 3). Furthermore, we also look into the di-Higgs channel $gg\to h'\to{hh}\to{b\bar{b}\gamma\gamma}$ at the High-Luminosity LHC (HL-LHC) with an integrated luminosity of $L_{\text{int}}=3000~{\text{fb}}^{-1}$.
We demonstrate that promising signals with high signal-to-background statistical significance ($S/\sqrt{B}$) can be obtained through the three aforementioned channels.

Speaker: Mr Mustafa Ashry (Department of Mathematics, Faculty of Science, Cairo University, Giza 12613, Egypt)

Mustafa_Ashry_Higgs_BSM_HHH.pdf