IRN Terascale @ IPHC Strasbourg

Session

Higgs and Electroweak

21 mai 2025, 09:15

Amphi Grünewald (IPHC)

21. The Two-Higgs Doublet Model beyond tree-level: A gauge-invariant formalism

Thomas Guérandel (LPSC)

21/05/2025 09:15

Higgs

Keeping the gauge symmetry manifest in the two-Higgs doublet model (THDM)
has turned out to be very powerful. Stability, electroweak-symmetry breaking, basis transformations, and general symmetries can be studied concisely in terms of gauge-invariant bilinears for any THDM Higgs potential. Recently, the formalism has been extended to the complete model, including the gauge and Yukawa sectors,...

15. A novel implementation of the Matrix Element Method at next-to-leading-order (NLO) for the measurement of the Higgs tri-linear coupling in di-Higgs production at the LHC

Matthias Tartarin (L2I Toulouse, Université de Toulouse, CNRS/IN2P3)

21/05/2025 09:40

Higgs

One of the LHC's priorities, following the discovery of the Higgs boson, is to observe the production of Higgs pairs and to measure the Higgs tri-linear coupling $\lambda_{3H}$.

Due to the rarity of di-Higgs production, measuring $\lambda_{3H}$ has proven to be highly challenging. Exclusion limits have been observed using a variety of approaches, including cut-based methods and boosted...

23. LCVision and beyond

Roman Poeschl (IJCLab)

21/05/2025 10:05

24. VBS measurement in semileptonic final states with ATLAS Run-2 data

Mathieu Markovitch (IJCLab)

21/05/2025 11:00

19. From Inclusive to Differential: Precision Measurements of ttW Production at 13 TeV

Nihal Brahimi (LAPP)

21/05/2025 11:25

Higgs

The production of a top–antitop quark pair in association with a W boson (${t\bar{t}}W$) is a dominant background in several measurements of rare processes, such as $t\bar{t}H$ and four-top ($t\bar{t}t\bar{t}$) production, as well as in searches for physics beyond the Standard Model. The precision, accuracy, and modeling of the ${t\bar{t}}W$ process represent a major limitation in the...

10. Impact of Background Processes in the $H \to Z \gamma$ Decay

Aliaksei Kachanovich (Université libre de Bruxelles)

21/05/2025 11:50

Higgs

In the study of the rare $H \to Z \gamma$ process, both ATLAS and CMS collaborations reported an excess with $\mu = 2.2 \pm 0.7$ in the number of events. Initially, this was interpreted as a modification of the $HZ\gamma$ vertex. However, the $H \to Z \gamma$ process is reconstructed from the $H \to \ell \ell \gamma$ final state, and background contributions were previously neglected. In this...