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T: Fachverband Teilchenphysik

T 24: Higgs Physics III (boson final states)

T 24.5: Vortrag

Dienstag, 1. April 2025, 17:15–17:30, ZHG104

Measurement of gluon fusion and vector-boson fusion Higgs-boson production cross sections in H→ WW^*→ lν lν decays with the ATLAS detector — •Ahmed Markhoos, Karl Jakobs, and Benedict Winter — University of Freiburg, Freiburg im Breisgau, Germany

As the Higgs boson decay with the second largest branching fraction, the decay to two W bosons (H→ WW^*) is not only advantageous due to its sizable signal yield. It also has a relatively clean signature with moderate backgrounds. This allows for accurate measurements of the total and differential cross-sections for Higgs boson production through the gluon-gluon fusion (ggF), vector boson fusion (VBF) and Higgs strahlung modes. Throughout the past decade, this decay channel has been analyzed with improving accuracy, directly testing the Standard Model predictions and measuring the Higgs boson’s couplings. In this talk, an overview of the ongoing H→ WW^*→ lν lν ggF and VBF Simplified Template Cross-Section (STXS) measurement of the full Run 2 ATLAS dataset is presented. The analysis greatly improves on the previously published Run 2 analysis by extending the use of multivariate techniques and considering Higgs-boson decays to light leptons of the same flavor (eν e ν/µ ν µ ν), which had been disregarded, in addition to different flavor decays (eν µν). This enables a more granular and precise STXS measurement with a considerably higher sensitivity.

Keywords: Higgs; ggF; VBF; W Boson