Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 20: Higgs 1 (boson final states)

T 20.5: Talk

Monday, March 4, 2024, 17:00–17:15, Geb. 30.41: HS 2

Measurement of gluon fusion and vector-boson fusion Higgs-boson production cross sections in H → WW^* → lν lν decays at √s=13 TeV with the ATLAS detector — •Ahmed Markhoos, Benedict Winter, Karsten Köneke, and Karl Jakobs — University of Freiburg, Freiburg, Germany

The Higgs-boson decay to two W bosons (H → WW^*) has proven to be crucial for measuring the Higgs-boson couplings and testing the Standard Model, given that it is the decay mode with the second largest branching ratio. H → WW^* → lν lν specifically provides a sizable signal and moderate background yields, allowing for accurate measurements of the total and differential cross-sections through gluon-gluon fusion (ggF), vector boson fusion (VBF) and Higgs Strahlung production modes. In this talk, an overview of the ongoing H → WW^* → lν lν ggF and VBF Simplified Template Cross-Section (STXS) analysis is presented, based on the full Run 2 dataset. This analysis improves significantly upon the first full Run 2 analysis by extending the use of multivariate techniques and considering Higgs-boson decays to light leptons of the same flavor (eν eν/µν µν) in addition to different flavor decays (eν µν). This in return enables a more granular and precise STXS measurement with noticeably higher sensitivity.

Keywords: Higgs; WW; Neural Networks; ATLAS; CERN