Conveners
Higgs theory and experiment
- Valentina Dutta (Carnegie-Mellon University (US))
Higgs theory and experiment
- Matthew🦜 Klein (Southern Methodist University (US))
Higgs theory and experiment
- David Miller (University of Chicago (US))
Higgs theory and experiment
- Jack Gunion (University of California Davis (US))
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Milada Margarete Mühlleitner19/08/2025, 16:30Higgs theory and experiment
ATLAS and CMS are searching for resonant di-$h_{125}$ production, where the $m_{hh}$ distributions are key. Within UV-complete models we compare the experimental procedure with the theoretical predictions. For parameter regions allowed by all current theoretical and experimental constraints, we find that the experimental limits cannot be readily applied to concrete model realizations. We...
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Sven Heinemeyer (CSIC (Madrid, ES))19/08/2025, 16:50Higgs theory and experiment
We discuss di-Higgs production in the SM extended by a real singlet, RxSM. The RxSM is the simplest model that can yield a Strong First Order Electroweak Phase Transition (SFOEWPT) in the early universe. We concentrate on the regions yielding a SFOEWPT, including higher-order corrections to the triple Higgs couplings, which can be substantial. We discuss the sensitivity of the HL-LHC and...
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Cecilia Tosciri (University of Chicago (US))19/08/2025, 17:10Higgs theory and experiment
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. Experimentally, the Higgs boson self-couplingm and thereby the shape of the Higgs...
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Tamas Almos Vami (Univ. of California Santa Barbara (US))19/08/2025, 17:30Higgs theory and experiment
The measurement of the production of Higgs boson pairs (HH) at the LHC allows the exploration of the Higgs boson interaction with itself and is thus a fundamental test of the Standard Model theory and has a key role in the determination of the Higgs boson nature. The most recent results from the CMS collaboration on measurements of non-resonant HH production using different final states and...
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Maxwell Cui (University of Arizona (US))19/08/2025, 17:50Higgs theory and experiment
Many new physics models predict the existence of resonant states decaying into two bosons, including the Higgs boson or new scalar S bosons. These processes provide crucial signatures in the search for physics beyond the Standard Model and may offer insights into the mechanism of electroweak symmetry breaking. In this talk, the latest results from searches for resonant Higgs boson pair (HH)...
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Sven Heinemeyer (CSIC (Madrid, ES))19/08/2025, 18:10Higgs theory and experiment
We demonstrate that a BSM triple Higgs coupling (THC) can possibly be measured at the HL-LHC using a Neural Network (NN). We take the 2HDM as concrete example, take into account all current theoretical and experimental constraints, as well as anticipated future experimental uncertainties. Depending on the mass of the involved BSM Higgs-boson and the value of the THC realized in nature, a...
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Badder Marzocchi (University of Minnesota (US))21/08/2025, 14:00Higgs theory and experiment
An important aspect of the Higgs boson physics programme at the LHC is to determine all the properties of this particle, including its mass, which is a free parameter in the SM, and its width. This presentation will discuss the latest developments in measurements of the Higgs boson mass and width, with data collected by the CMS experiment at a centre of mass energy of 13 TeV. Both direct and...
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Maria Mironova (Lawrence Berkeley National Lab. (US))21/08/2025, 14:20Higgs theory and experiment
This talk presents recent precision measurements of key properties of the Higgs boson using the full dataset of proton-proton collisions at √s = 13 TeV and 13.6 teV collected during Run 2 and Run 3, respectively, of the LHC by the ATLAS experiment. Recent projections done for the HL-LHC will also be discussed.
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Leonardo Giannini (Univ. of California San Diego (US))21/08/2025, 14:40Higgs theory and experiment
The discovery of the Higgs boson ten years ago and successful measurement of the Higgs boson couplings to third generation fermions by ATLAS and CMS mark great milestones for HEP. The much weaker coupling to the second generation quarks predicted by the SM makes the measurement of the Higgs-charm coupling much more challenging. With the full run-2 data and with the advent of ML flavour tagging...
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Rohith Saradhy (University of Minnesota (US))21/08/2025, 15:00Higgs theory and experiment
To fully characterize the Higgs boson, it is important to establish whether it presents coupling properties that are not expected in the Standard Model of particle physics. These can probe BSM effects, such as CP conserving or CP violating couplings to particles with masses not directly accessible at the LHC through virtual quantum loops. In this talk we will present the most recent searches...
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Rafael Filipe Teixeira Boto (Instituto Superior Técnico)21/08/2025, 16:30Higgs theory and experiment
With LHC Run 3 in progress, the 125GeV Higgs boson couplings are being examined in greater detail, while testing for additional scalars. Multi-Higgs frameworks allow Higgs couplings to significantly deviate from Standard Model values, enabling indirect probes of extra scalars. We consider the possibility of large pseudoscalar Yukawa couplings in the softly-broken three-Higgs doublet model with...
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Leonardo Giannini (Univ. of California San Diego (US))21/08/2025, 16:50Higgs theory and experiment
The full set of data collected by CMS experiment at a centre of mass energy of 13 TeV allows searches for rare production modes of the Higgs boson, subdominant with respect the ones already observed at the LHC, by using a variety of decay modes profiting of the ones with largest expected branching fractions. We also discuss rare Higgs boson decay channel searches with the CMS experiment....
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Chris Meyer (Indiana University (US))21/08/2025, 17:10Higgs theory and experiment
The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions of the Standard Model addressing such shortcomings introduce additional Higgs bosons, beyond-the-Standard-Model...
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Axel Newton Buchot Perraguin (University of Alabama (US))21/08/2025, 17:30Higgs theory and experiment
We present searches for additional Higgs bosons from the CMS experiment. A variety of states are searched for, at masses both above and below 125 GeV.
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Aleksander Zarnecki (University of Warsaw (PL))22/08/2025, 14:00Higgs theory and experiment
Extra light scalars are still not excluded by the existing experimental constraints, provided their coupling to the SM gauge bosons is sufficiently suppressed. They could be produced at the e$^+$e$^-$ Higgs factory in a scalar-strahlug process, analogous to the Higgs-strahlung process being the dominant production channel for the 125 GeV Higgs boson. This was selected as one of the focus...
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Milada Margarete Mühlleitner22/08/2025, 14:20Higgs theory and experiment
Within the framework of the 2HDM we discuss di-$h_{125}$ production at future high-energy $e^+e^-$ colliders, such as ILC or CLIC. We analyze the sensitivity to BSM triple Higgs couplings (THCs), taking into account experimental errors and uncertainties. Our results indicate that BSM THCs can possibly accessed at ILC or CLIC.
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Duncan Rocha (University of Chicago)22/08/2025, 14:40Higgs theory and experiment
The electron Yukawa coupling is expected to be the last Standard Model coupling to be measured, requiring the next generation of colliders. In the coming decades, the FCC will offer a constraint on the Higgs-electron coupling that is within a factor of a few with the Standard Model value. If a discovery of this coupling is made at the FCC, it would be a clear sign of new physics. However,...
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Lukas Treuer (Yukawa Inst., Kyoto U. and KEK, SOKENDAI (Japan))22/08/2025, 15:00Higgs theory and experiment
Motivated by recent advancements in antimuon cooling, we study Higgs boson production at $\mu^+\mu^+$ colliders at high energy. Since both initial-state particles are positively charged, there is no $W$ boson fusion at the leading order, as it requires a $W^+W^−$ pair. However, we find that the cross section of the higher-order, $\gamma$- and $Z$-mediated $W$ boson fusion process is large at...
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Sven Heinemeyer (CSIC (Madrid, ES))22/08/2025, 15:20Higgs theory and experiment
We analyze di-Higgs production at a future $\mu^+\mu^-$ collider. As a concrete framework we take the SM extended by a real Singlet (RxSM), the simplest Higgs-sector extension that can yield a Strong First Order Electroweak Phase Transition (SFOEWPT) in the early universe. Concentrating on the parameter space yielding a SFOEWPT we demonstrate that with the measurement of different di-Higgs...
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Dr Jayita Lahiri (University of Hamburg)22/08/2025, 15:40Higgs theory and experiment
We explore the possibility of CP-violation in the complex-singlet extension of 2HDM. The addition of complex singlet paves the way for additional sources of CP-violation compared to 2HDM. If a Z2-symmetry is imposed on the complex-singlet, such a model can accommodate a dark matter candidate as well. We identify the regions of parameter space, that can fit DM observables and at the same time...
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Prof. Carlos Wagner (University of Chicago)Higgs theory and experiment
We consider 2-to-2 scatterings of Higgs bosons in a CP-conserving two-Higgs-doublet model (2HDM) and study the implication of maximizing the entanglement in the flavor space. In the unbroken phase and turning off the gauge interactions, entanglement maximization results in the appearance of an U(2) x U(2) global symmetry. Interestingly, once the Higgs bosons acquire vacuum expectation values,...
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