Conveners
Non plenary session: Session I
- Daniel Winterbottom (Imperial College (GB))
Non plenary session: Session II
- Lisa Biermann
Non plenary session: Session I
- Liron Barak (Tel Aviv University)
Non plenary session: Morning Session
- Jose Miguel No (IFT-UAM/CSIC)
Non plenary session: Session I
- Andreas Papaefstathiou (Kennesaw State University (US))
Non plenary session: Session II
- Tatjana Lenz (University of Bonn (DE))
Non plenary session: Morning Session II
- Wrishik Naskar (DESY)
Non plenary session: Afternoon Session II
- Panagiotis Stylianou (University of Cyprus)
Non plenary session: Morning Session II
- Jason Veatch (California State University (US))
Non plenary session: Afternoon Session I
- Anne-Marie Magnan (Imperial College (GB))
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Jason Veatch (California State University (US))01/06/2026, 14:00
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Saiyad Ashanujjaman (Karlsruhe Institute of Technology)01/06/2026, 14:201
The 125 GeV Higgs discovery completed the Standard Model, yet no new particles have appeared since. Still, multi-lepton anomalies at the LHC hint at another scalar around 150 GeV, decaying mainly to W bosons but not Z bosonsโsuggesting a neutral triplet. A reanalysis of ATLAS Run-2 diphoton data shows a 4ฯ excess near 152 GeV with a branching fraction near 0.7%. We find that this fits...
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Junquan Tao (Institute of High Energy Physics, Chinese Academy of Sciences (CN))01/06/2026, 14:40
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Mohamed Ouchemhou (Ruฤer Boลกkoviฤ Institute, Bijenicka cesta 54, P.O. Box 180, 10002 Zagreb , Croatia)01/06/2026, 15:001
We study the production of Beyond the Standard Model light scalar states in association with a vector boson ($Vh_2$, with $V = W^\pm, Z$) at the LHC. We consider the scenario where the Standard Model scalar sector is extended by two real scalar singlets, where these additional scalars have mass $ M_i \leq M_{h_{125}}$. In this work, the scalar boson $h_2$ decays via $h_2 \to h_1 h_1 \to 4b$,...
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Malin Elisabeth Horstmann (Technische Universitat Munchen (DE))01/06/2026, 16:10
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Jason Veatch (California State University (US))01/06/2026, 16:30
A new, user-friendly tool has been made available for scanning the Two-Real-Singlet Model (TRSM) parameter space to efficiently find the maximum rates. The tool provides a python interface to ScannerS and HiggsTools that automates much of the scanning process, makes use of multi-threading for high efficiency, and compiles results for easy interpretability. This talk presents the tool as well...
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Efe Yazgan (National Taiwan University (TW))01/06/2026, 16:50
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Mohamed Krab (National Taiwan University)01/06/2026, 17:10
We investigate the discovery prospects of a charged Higgs boson ($H^\pm$) at the Large Hadron Collider (LHC) via the process $cg\to bH^\pm \to bc\bar{b}$ within the framework of a general two Higgs doublet model (G2HDM). In most two Higgs doublet models, the $H^+ cb$ coupling ($g_{H^+cb}$) is usually suppressed by the CKM matrix element $V_{cb}$. In G2HDM, there are additional Yukawa...
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Tatjana Lenz (University of Bonn (DE)), Tristan Arnoldus Du Pree (Nikhef National institute for subatomic physics (NL))02/06/2026, 14:00
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Pritam Palit (Carnegie-Mellon University (US))02/06/2026, 14:20
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Dr Gauhar Abbas (Indian Institute of Technology (BHU) Varanasi)02/06/2026, 14:40
We demonstrate that QCD-like gauge dynamics can be consistently embedded within the Dark Technicolor paradigm by invoking the extended Most Attractive Channel hypothesis, thereby revitalizing conventional technicolor scenarios. In this framework, the Higgs mass is generated dynamically while remaining consistent with electroweak precision tests, including constraints from the $S$ parameter....
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Dr Ying-nan Mao (Wuhan University of Technology)02/06/2026, 15:00
CP-violation may appear in different BSM models with extended scalar sector. In this talk, I will present the collider tests on CP-violation in heavy scalar sector, including the CP-violation effects in Yukawa interaction or pure bosonic sector. This talk will also briefly discuss the CP-violation effects in the scenario with near degeneration heavy scalars. The talk is based on papers EPJC...
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Olivia Simon02/06/2026, 15:20
Constraining the Higgs self-coupling at collider experiments allows us to better understand the shape and properties of the Higgs potential, which is a promising avenue into New Physics beyond the Standard Model (SM). The current experimental uncertainties on the Higgs self-coupling, parametrised by $\kappa_\lambda$, are of $\mathcal{O}(100\%)$, while Higgs couplings to the weak gauge bosons,...
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Andreas Papaefstathiou (Kennesaw State University (US))03/06/2026, 11:45
Extended scalar sectors can modify the Higgs self-interactions and, in some scenarios, significantly enhance multi-Higgs production rates. In this talk, I will discuss the prospects for probing such effects through triple-Higgs production at future hadron colliders. I will compare cut-based and multivariate analysis strategies under realistic detector-smearing and background assumptions, and...
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Wrishik Naskar (DESY)03/06/2026, 12:05
In this talk, I shall be discussing the complex kinematic structure involved in resonant production of three Higgs bosons at hadron colliders such as the (HL-)LHC, within rich scalar spectra of the Next-to-minimal 2HDM (N2HDM), which features three CP-Even neutral scalar degrees of freedom. Focussing on the resonant topologies, I discuss and analyse the invariant mass and transverse momentum...
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Jose Miguel No (IFT-UAM/CSIC)03/06/2026, 14:00
Extended scalar sectors can yield baryogenesis at the EW scale. This is generally related to their providing a first order EW phase transition to yield the required departure from thermal equilibrium. While such non-minimal Higgs sectors can also provide BSM sources of CP violation as required for baryogenesis, these are tightly constrained by EDMs. Here we present a scenario where this CP...
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Guglielmo Coloretti03/06/2026, 14:20
The observation of resonant di-Higgs production, which would strongly suggest the existence of a new heavy neutral scalar H, has been searched for extensively at the LHC. In the two-Higgs doublet model (2HDM) with mH >> mh, where h is the Higgs boson of mass 125 GeV observed at the LHC, we show that a direct correlation emerges between Br(Hโhh) and Br(HโVV), with V=Z,W, which depends only on...
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Lisa Biermann03/06/2026, 14:40
Charged Higgs-pair production at hadron colliders provides an option to obtain information about the trilinear couplings involving charged Higgs states of BSM Higgs potentials. We analyze the corresponding production modes, DrellโYan-like production, gluon fusion and vector-boson fusion at next-to-leading order with respect to the corresponding uncertainties originating from the scale...
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Jamie Chang03/06/2026, 15:00
Gluon fusion, gg โ HH, is the dominant Higgs-pair production process at the Large
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Hadron Collider (LHC) and provides the ๏ฌrst direct access to the trilinear Higgs self-interaction. The process is loop-induced, with the main contribution emerging from top-quark loops within the Standard Model. In the past, the QCD corrections have been calculated and found to increase the cross section... -
Panagiotis Stylianou (University of Cyprus)03/06/2026, 15:20
Di-top production is a key search channel for scalar particles arising in theories beyond the Standard Model. Despite its high signal cross section, large interference effects with the sizeable QCD background can complicate the search for new particles. In scenarios with mixing between multiple scalars, signal-signal interference contributions can also arise and must be properly taken into...
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Moritz Bosse03/06/2026, 16:10
The real singlet extension of the Standard Model provides a simple but well-motivated framework to address the origin of the baryon asymmetry and the stability of the electroweak vacuum. We revisit the viable parameter space in light of present and future collider probes. Our analysis combines precision Higgs measurements, sensitivity to modifications of the trilinear Higgs self-coupling, and...
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Dr Miguel Ruben Nebot Gรณmez (U. of Valencia - IFIC)03/06/2026, 16:30
It was recently shown that in multi-Higgs models with a CP invariant potential and spontaneous CP violation, despite having free quadratic parameters that could induce a decoupling regime for the new scalars, that possibility cannot be fully realized. Contrary to expectations, there are states with masses that cannot be much larger than the electroweak scale once perturbativity constraints are...
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Majid Ekhterachian (Scuola Normale Superiore, Pisa)04/06/2026, 11:00
Electroweak baryogenesis (EWBG) provides an intriguing mechanism to explain the observed baryon asymmetry. Its successful realization requires a new source of CP violation, which generically leads to a ย contribution to the electric dipole moment (EDM) of electron. The remarkable improvement in experimental bounds on the EDM of electron has put models of EWBG under severe stress. I will discuss...
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Philipp Schicho (University of Geneva)04/06/2026, 11:20
We investigate the effect of higher-dimensional marginal operators on the thermodynamics of cosmological phase transitions. Focusing on the Abelian Higgs model, we systematically match these operators, which arise at higher orders in the underlying high-temperature expansion of thermal effective field theory, and use field redefinitions to construct a complete, minimal, and gauge-invariant...
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Dr Manuel Ettengruber (IPhT)04/06/2026, 11:40
Theories with a large number of long-lived metastable vacua are our only concrete explanation for the puzzling value of the Cosmological Constant (CC). The energy scales where these vacua are realized are unknown. In this work, we consider the possibility that a sector of this landscape of vacua is within experimental reach and discuss its signatures at colliders. We find that striking...
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Francisco Arco04/06/2026, 15:30
We investigate the potential of future electron-positron colliders, such as the FCC-ee, to test a strong first-order electroweak phase transition (SFOEWPT) in the CP-conserving type I two-Higgs-doublet model. We confront the SFOEWPT favored parameter space with projected electroweak precision and Higgs measurements, as well as searches for additional scalar states. We show that loop...
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Mx Osama Karkout (Nikhef National institute for subatomic physics (NL))04/06/2026, 15:50
Extending the Higgs sector by two real scalar singlets (TRSM) is a popular model for collider phenomenology. Implications for electroweak baryogenesis have been recently studied. This work continues to study parameter spaces viable for the desired first-order electroweak phase transitions in association with dark matter candidates and enhanced di-Higgs production at the LHC.
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Mr Subhajit Kala (Indian Institute of Technology Guwahati)04/06/2026, 16:101
We investigate an extension of the Standard Model (SM) consisting of a new dark spin-0 scalar particle, formulated within an effective field theory (EFT) framework. To accurately connect a high-scale new physics model to low-energy phenomenological observables, an exact renormalisation group evolution (RGE) is essential.
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In this work, we present a complete computation of the one-loop... -
Daniel Litim (University of Sussex (GB))04/06/2026, 16:30
We revisit the status and prospects for vacuum stability in the Standard Model. We explain how the quest for stability can be used to guide model building and searches for new physics. Examples are provided including models with extended scalar sectors and Higgs portal interactions.
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Rachit Sharma (Indian Institute of Science Education and Research Thiruvananthapuram, India)05/06/2026, 11:00
Leptoquarks (LQs), colour-triplet bosons that couple quarks and leptons, arise naturally in several Beyond the Standard Model (BSM) frameworks and constitute well-motivated targets for searches at the Large Hadron Collider (LHC). This work presents a comprehensive study of LQ phenomenology through refined reinterpretations of LHC Run II data and investigations of new production channels...
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Anne-Marie Magnan (Imperial College (GB))05/06/2026, 11:20
Limits on the masses of the neutral scalars in the Inert Doublet Model are obtained for the first time from a dedicated search using CMS collision data at โs =13 TeV and โs =13.6 TeV, corresponding to integrated luminosities of 138 fbโ1and 35 fbโ1, respectively. The target final state consists of exactly two opposite-charge same-flavour leptons (electrons or muons), with very little hadronic...
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Charlotte Cavanagh (ETH Zurich (CH))05/06/2026, 11:40
The FASER detector at the LHC is able to probe numerous new physics models, recent results include searches for: dark photons, axion-like particles (ALPs) and an interpretation of the Type-I โfermiophobicโ two Higgs doublet model in which a second Higgs doublet $\phi_{2}$, coupling to fermions and leading to a new CP-even scalar Higgs, is predicted. FASER probes the Type-I 2HDM model in the...
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Nathan Grieser (University of Cincinnati (US))05/06/2026, 12:00
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Cristian Sierra (Tsung-Dao Lee Institute)05/06/2026, 14:00
The general 2HDM allows for off-diagonal flavour violating couplings in the quark sector which are strongly constrained by experiments in traditional 2HDMs. We study how the allowed parameter space of the general 2HDM changes once interactions between 3-1 and 3-2 quark generations are included, generating new interference terms in the one loop diagrams relevant for meson mixing constraints...
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Vishakha Lingadahally05/06/2026, 14:20
The process of top quark pair production through the decay of the scalars in the 1-Higgs-singlet extension of the Standard Model is associated with large interference effects between the loop-induced SM-like Higgs boson and heavy Higgs boson amplitudes, and the QCD continuum background. We attach leptonic decays to the di-top final state at NLO and study the effects of spin correlation in the...
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Alexander Hogg05/06/2026, 14:40
The kappa framework is widely used to parameterise deviations from Standard Model predictions in Higgs measurements. In particular, the parameter $\kappa_Z$, which can be thought of as parameterising new physics in the $HZZ$ vertex, provides a benchmark for future collider sensitivity, such as the future circular collider (FCC). However, it is unclear what exactly this parameter corresponds...
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Anisha . (Karlsruhe Institute of Technology)05/06/2026, 15:00
In this work, we explore the phenomenological consequences of non-minimal hidden-sector interactions on observable correlations in the Higgs sector, mediated by the $\mathbb{Z}_2$-symmetric Higgs portal. Particular attention is given to non-standard momentum dependencies of the hidden-sector scalar, which arise naturally in an effective field theory (EFT) framework such as composite scalar...
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Zhen Liu05/06/2026, 15:20
Higgs final states are central targets in the search for physics beyond the Standard Model. In the conventional picture, $SU(2)$ symmetry together with the Goldstone equivalence theorem correlates Higgs and gauge-boson final states, implying comparable sensitivities in channels such as $hh$, $ZZ$, and $WW$ for heavy resonances. In this work, we identify a simple way to parametrically violate...
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Amit Bhoonah
Proton decay experiments typically constrain baryon number violation to the scale of grand unified theories. From a phenomenological point of view, this makes direct probing of the associated new resonances, such as the X and Y bosons, out of reach for even the most optimistic future experiments. It has, however, been known that certain specific patterns of baryon and lepton number violation...
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Niloy Mondal (Student)
We study a generic extension of the Type-I seesaw framework where the neutrino sector is connected to a dark sector containing either fermionic or scalar dark matter (DM) through a scalar mediator ($\Phi$). In this scenario, all beyond the Standard Model (BSM) fields are charged under a discrete symmetry (such as $\mathcal{Z}_4$) that forbids the usual renormalizable Type-I seesaw Yukawa...
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BRAHIM AIT OUAZGHOUR
In this talk, I will synthesize comprehensive investigations into the phenomenology of the charged Higgs boson ($H^\pm$) within the framework of the Two-Higgs-Doublet Model (2HDM) at future high-energy lepton colliders. We specifically focus on the comparative potential of muon ($\mu^+\mu^-$) and electron-positron ($e^+e^-$) machines, such as the International Linear Collider (ILC) and the...
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Graham White (Southampton)
Long lived particles are notoriously difficult to test. I look at the complimentarity between ground based detectors and both indirect and direct cosmic probes either resulting due to an early period of matter domination or late time decays. I then show the applications to dark matter, quantum gravity and leptogenesis.
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Hrishikesh Deka
We study the phenomenology of a light charged Higgs boson in the framework of the Alternative Left--Right Symmetric Model (ALRM). In this model, stringent flavor constraints are evaded due to a non-conventional fermion spectrum in which the right-handed up-type quarks are paired with the exotic down-type quarks rather than the Standard Model down-type quarks, leading to the absence of...
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Victor Maura Breick (King's College London)
We study whether a non-minimal Higgs portal can be distinguished from the minimal Higgs portal. A higher-dimensional Higgs portal operator leads to energy-growing effects that would not be present for the minimal case. This difference could in principle be used to disentangle the nature of the Higgs portal. We show that these effects are too small to be observed for Higgs portals with on-shell...
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Mr Mohamed Younes Sassi (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
Extended Higgs sectors such as the 2HDM and N2HDM provide new discrete symmetries, which, upon spontaneous symmetry breaking, can lead to the formation of topological defects called domain walls. In this talk, I discuss some consequences of these domain walls on the early universe, such as electroweak symmetry restoration necessary for Electroweak baryogenesis via domain walls, as well as the...
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Najimuddin Khan (Department of Physics , Aligarh Muslim University)
We analyze a singlet dark matter model featuring additional scalars and fermions. The scalar quartic and Yukawa couplings play key roles in achieving the correct relic density through both freeze-out and freeze-in mechanisms. In addition to the SM-like high-scale minimum along the Higgs direction, new minima can arise along the extended scalar direction, depending on the dark matter parameter...
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CHANDRIMA SEN
In this talk, I will discuss the prospects of probing a light scalar state in the Type-I Two-Higgs Doublet Model (2HDM) at the LHC. In this framework, one of the additional scalar states can be as light as $\lesssim 100$ GeV while remaining consistent with current collider and flavour constraints, yet it can evade conventional search strategies due to its suppressed couplings to the SM Higgs...
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Snehashis Parashar (Institute of Physics, Bhubaneswar, India)
Scalar triplets with $Y=0$ are minimal extensions of the Standard Model (SM) with broad phenomenological appeal. The inert Triplet Model (ITM) offers a WIMP Dark Matter (DM), while the non-inert Higgs Triplet Model (HTM) provides a custodial symmetry-violating signature, with both models offering prospects for a first-order EW phase transition (FOPT). We will discuss the discovery prospects of...
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Rafael Filipe Teixeira Boto
We study Higgs pair production in models with extended scalar sectors in accordance with all relevant theoretical and most recent experimental constraints. We applyย state-of-the-art machine learning algorithms to map the allowed parameter space of the models considered. By employing an Evolutionary Strategy augmented with Novelty Reward we are able to maximise experimental signatures to find...
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Mr Khalid Goure (Cadi Ayyad University, Faculty of Science Semlalia, LPHEAG, P.O.B. 2390 Marrakech 40000, Morocco.)1
We analyze charged Higgs production in the 2HDMcT Type-III framework at future $\mu^+\mu^-$ colliders, focusing on $2\to2$ channels $\mu^+\mu^- \to H_1^+ S^-$ ($S^- = H_1^-, H_2^-$) and $\mu^+\mu^- \to H_1^+ W^-$. Imposing current theoretical and experimental constraints, we show that $\sigma(\mu^+\mu^- \to H_1^+ H_1^-)$ can match or surpass the corresponding $e^+e^-$ rate, while...
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Jaouad EL FALAKI
We present a full one-loop study of charged scalar pair production in photonโphoton collisions, ฮณฮณ โ HยฑHโ, within the Inert Doublet Model (IDM). This process provides a clean and sensitive probe of the extended scalar sector at future high-energy photon colliders.
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We show that radiative corrections play a crucial role, significantly modifying the leading-order predictions. In particular, the... -
Karim Elyaouti
We provide a study of the parameter space of the complex 2-Higgs Doublet Model (C2HDM), focusing on signs of large CP-violating couplings of the 125~GeV Higgs boson with the fermions. The study is performed utilizing Machine Learning (ML) techniques developed recently for parameter space exploration, including an Evolutionary Strategy Algorithm and Novelty Reward. We give particular attention...
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Dr Avinanda Chaudhuri (Brahmananda Keshab Chandra College)
We investigate a two-triplet Type-II seesaw extension of the Standard Model at the TeV scale, focusing on its implications for neutrino mass generation, lepton flavor violation (LFV), and leptogenesis. Assuming normal neutrino mass hierarchy, we reconstruct the Yukawa sector consistent with current oscillation data, obtaining perturbative couplings and LFV observables safely within existing...
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Abhik Sarkar (Indian Institute of Technology Guwahati)
Vector-like fermions offer a compelling framework to connect the Standard Model (SM) with the dark sector through Yukawa-type interactions, thereby realizing a class of models known as "Vector-like Fermion Portals". Such constructions can naturally accommodate both single and multi-component dark matter (DM) candidates, while yielding diverse phenomenological signatures across cosmology,...
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Dr Rituparna Ghosh (Indian Institute of Technology Kanpur)
The absence of conclusive evidence for beyond the Standard Model (BSM) physics at the Large Hadron Collider (LHC) motivates the exploration of unconventional signatures alongside precision measurements. In this work, we investigate the Georgi--Machacek model, an extension of the Standard Model scalar sector with one complex and one real $SU(2)$ triplet, which allows sizable triplet vacuum...
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Souad Semlali (School of Physics and Astronomy, University of Southampton)
Within the framework of the Two-Higgs-Doublet Model (2HDM), we investigate the scope of the LHC in accessing the processes $H \to hh \to 2b2\tau,~2b2\gamma$ and $pp \to Z^{*} \to hA \to 4\tau$ย in searches for low-mass Higgs bosons. By performing a Monte Carlo (MC) analysis using dedicated triggers and kinematic selections, we extract these signals from Standard Model (SM) backgrounds. Our...
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Juhi Dutta
Abstract: Dark matter remains one of the most compelling indications of new physics beyond the Standard Model. In this talk, I will present theoretical frameworks accommodating dark matter candidates, focusing on their dark matter phenomenology. I will place particular emphasis on extended scalar sectors as portals to the dark sector and highlight their discovery prospects at current and...
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Dr SUHAIL KHAN (Centre for Theoretical Physics,Jamia Millia Islamia)
We investigate the phenomenological aspects of a feebly interacting sterile neutrino dark matter candidate within a low-scale seesaw framework. The Type-I seesaw model is augmented by a second complex scalar doublet ($\Phi_{\nu}$), which couples exclusively to the heavy right-handed neutrinos and the lepton doublet, thereby generating the neutrino Dirac mass term while the first scalar doublet...
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Joรฃo Antรณnio Costa Matos
With the ongoing Run 3 stage of LHC, the couplings of the 125 GeV Higgs are being determined with higher precision. However, within the experimental uncertainty, potential deviations from the SM predictions can be accommodated. Such deviations are realisable in models with multiple Higgs doublets, the NHDMs. These models naturally give rise to flavour changing neutral couplings at tree level,...
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Soumya Sadhukhan (Ramakrishna Mission Residential College (Autonomous), Vivekananda Centre for Research, Narendrapur, Kolkata, West Bengal, India-700149)
We study two-component dark matter (DM) scenario in the neutrinophilic two-Higgs doublet model (ฮฝ2HDM), which is extended with a light (โผ 10 MeV) singlet scalar DM. This light dark matter can only effectively annihilate through the CP even scalar H. Although the presence of a light scalar H can modify the oblique parameters to put tight constraints on the model, resolution can come from the...
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Swagata Ghosh
The Georgi-Machacek (GM) model allows a significant triplet vacuum expectation value ($v_2$) while naturally preserving custodial symmetry. Previously, $v_2$ has been constrained by $b \to s \gamma$ data as a function of the custodial triplet mass ($m_3$). In this work, we update these constraints by incorporating the latest ATLAS and CMS $13$ TeV results from light charged Higgs boson...
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