Welcome and introduction

• Tania Natalie Robens (Rudjer Boskovic Institute (HR))

Multi-Higgs production and the Electroweak Phase Transition through TRSM

• Osama Karkout (Nikhef National institute for subatomic physics (NL))

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.

Model dependent and model independent enhancement to triple Higgs production

• Gilberto Tetlalmatzi-Xolocotzi (Siegen University)

Associate production of light scalars at the LHC [tbc]

• Aman Desai (University of Adelaide (AU))

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

• Prasenjit Sanyal (Konkuk University)

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.

BSM Phenomenology of Higgs Bosons in Collider Experiments

• Mohamed Ouchemhou (LHEPA)

Experimental perspective [tbc]

• Dinko Ferencek (Rudjer Boskovic Institute (HR))

Dissecting multi-Higgs production in new physics models

• Andreas Papaefstathiou (Kennesaw State University, GA, USA)

Search for a CP-even Heavy Higgs Boson in Supersymmetric B-L SM extension at the LHC

• Mustafa Ashry (Department of Mathematics, Faculty of Science, Cairo University, Giza 12613, Egypt)

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.