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Dr Johannes Braathen (DESY)10/11/2026, 16:00Higgs and ElectroweakOral presentation (onsite)
In this talk, I will point out the relevance of a new class of model-independent higher-order contributions to the trilinear and quartic self-couplings of the detected Higgs boson giving rise to potentially large effects of physics beyond the Standard Model (SM). It consists of SM-like diagrams with insertions of loop-corrected values for the trilinear and quartic Higgs self-couplings. While...
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Julie Munch Torndal (DESY)10/11/2026, 16:18Higgs and ElectroweakOral presentation (onsite or remote - not decided)
The Higgs self-coupling measurement is an absolute must-have for establishing the Higgs mechanism experimentally. The Higgs self-coupling can be accessed at tree level through double Higgs production. In $e^+e^-$ collisions at 550 GeV, the dominant production mode is double Higgs strahlung with the ZHH final state, where the analysis projects a discovery reach on the Higgs self-coupling. A...
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Bryan Bliewert10/11/2026, 16:36Higgs and ElectroweakOral presentation (onsite or remote - not decided)
The Higgs sector represents one of the least well-measured areas of high-energy particle physics. A key interest lies in the measurement of the Higgs self-coupling $\lambda_{HHH}$, which would establish the mechanism of electroweak symmetry breaking. This contribution follows last year's input to the European Strategy for Particle Physics Update (ESPPU), which extrapolated the...
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Dr Amir Subba (Wilczek Quantum Center, SIAS, USTC)10/11/2026, 16:54Higgs and ElectroweakOral presentation (remote)
I will discuss the sensitivity to the Higgs self-coupling through $W$ boson fusion di-Higgs production at $e^-e^+$ collider at $\sqrt{s}=3$ TeV (arXiv:2608.05096). The interplay between the Higgs self-coupling modifier ($\kappa_{\lambda}$) and Higgs-gauge boson coupling modifiers ($\kappa_{V}$ and $\kappa_{2V}$) within the $\kappa$ framework, will be discussed. The separation between signal...
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Georg Ralf Weiglein (Deutsches Elektronen-Synchrotron (DE))10/11/2026, 17:12Higgs and ElectroweakOral presentation (onsite or remote - not decided)
While in present experimental determinations of the trilinear Higgs-boson self-coupling often all other coupling modifiers are set to their Standard Model values, it is important to take into account the impact of all coupling modifiers or EFT operators that are not well constrained by the single Higgs production processes. Incorporating the dependence on the relevant other coupling modifiers,...
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Umar Qureshi (Stanford University)12/11/2026, 11:00Higgs and ElectroweakOral presentation (onsite or remote - not decided)
The X-ray Free-Electron Laser (XFEL) Compton Collider (XCC) concept
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offers a uniquely powerful environment for precision Higgs sector
measurements, providing complementary strengths to proposed $e^+e^-$
and future high-energy hadron colliders. We present comprehensive
physics sensitivity studies for both single Higgs production at
$\sqrt{s} = 125$ GeV and Higgs pair production... -
Kanako Watanabe12/11/2026, 11:18Higgs and Electroweak
Flavor-changing Higgs decays are highly suppressed in the Standard Model and provide an important probe of new physics. In particular, the $H \to bs$ decay is a rare flavor changing decay, and the search for this decay provides an important probe of the flavor structure of the Higgs boson. In this study, we investigate the feasibility of searching for the $H \to bs$ decay using simulation data...
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Juhi Dutta12/11/2026, 11:36Higgs and ElectroweakOral presentation (onsite or remote - not decided)
The discovery of the Higgs boson has opened new avenues to probe physics beyond the Standard Model. Extended Higgs sectors predict additional scalar and pseudoscalar states that can modify Higgs production at the LHC. In this talk, we investigate pseudoscalar contributions to Higgs-strahlung, the associated production of a Higgs and Z boson, within the Two Higgs Doublet Model and its extension...
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Kodai Sakurai12/11/2026, 11:54Higgs and ElectroweakOral presentation (onsite)
Higgs precision measurements provide an opportunity to test various extended Higgs models. To exploit the high precision of future experimental measurements, theoretical predictions must be calculated with comparable precision by including higher-order corrections. In this talk, we focus on the real Higgs triplet model, a representative extended Higgs model with custodial symmetry violation....
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Takumi Seino (The university of Tokyo)12/11/2026, 12:12Higgs and ElectroweakOral presentation (onsite or remote - not decided)
The measurement of Higgs coupling constants is one of the most important goals for Higgs factories. While the couplings of the Higgs boson to the top and bottom quarks have been experimentally confirmed, the coupling to the lighter quark like strange has not yet been observed due to its small decay branching ratio.
We evaluated the measurement accuracy of the Higgs couplings using simulated...
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Victor Schwan (Deutsches Elektronen-Synchrotron (DE))12/11/2026, 16:00Higgs and ElectroweakOral presentation (onsite)
The International Large Detector (ILD) concept is being studied as a possible detector option for several future $e^+e^-$ Higgs factories. To assess the physics potential of ILD-like detector configurations at FCC-ee, the existing detector models and reconstruction chain are being adapted to the relevant FCC-ee beam conditions, event environment, and software framework. This contribution...
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Kei Yagyu (Tokyo University of Science)12/11/2026, 16:18Higgs and ElectroweakOral presentation (onsite)
H-COUP is a computational tool for evaluating Higgs-boson decay rates and branching ratios, including one-loop corrections, in various extended Higgs sectors. Such precision calculations are essential for interpreting future measurements at Higgs factories, such as the ILC, FCC-ee, and CEPC, and for probing the underlying structure of the Higgs sector.
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In this talk, we present the main... -
Wolfgang Kilian (University of Siegen)12/11/2026, 16:36Higgs and ElectroweakOral presentation (onsite)
We present a status report on recent developments in the WHIZARD event generator, an efficient and widely used tool for the simulation of exclusive and inclusive multi-particle processes at lepton colliders. In particular, we review progress in NLO calculations within the Standard Model and beyond, and new developments within the framework of collinear factorization, the Equivalent Vector...
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Krzysztof Mekala12/11/2026, 16:54Higgs and ElectroweakOral presentation (remote)
Precision measurements of Standard Model parameters are essential to overconstrain the theory and search for signatures of new physics. These parameters also serve as critical inputs for a wide range of precision physics analyses. In particular, the electroweak couplings of quarks provide valuable insights into the SM gauge structure and enable stringent tests of flavour universality.
In...
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Juan Ramírez Alfaro (IFIC (UV/CSIC))12/11/2026, 17:12Higgs and ElectroweakOral presentation (remote)
Measurements at electron-positron colliders can probe the scale evolution of quark masses predicted by the Standard Model in several ways. LEP and SLD extracted $m_b(m_Z)$ from three jet rates in $Z\rightarrow b\bar{b}$ decay. A future $Z$-pole run can improve the precision considerably, while a measurement of $m_b$ at higher scale is possible from $e^+e^- \rightarrow b\bar{b}$ production at...
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魁里 齊藤 (岩手大学総合科学研究科理工学専攻)Higgs and ElectroweakPoster (onsite only)
Understanding how effective interactions affect individual amplitudes and their interference can help interpret deviations from Standard Model predictions. In this poster, we study these effects in Zh production accompanied by neutrinos at future TeV-scale lepton colliders within the Standard Model Effective Field Theory (SMEFT). We use the Feynman-Diagram (FD) gauge to organize the amplitude...
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