Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 5: Higgs decay in fermions I

T 5.3: Talk

Monday, March 15, 2021, 16:30–16:45, Te

Measurements of Simplified Template Cross Sections in the H→ττ decay channel at the ATLAS experiment — •Fabian Becherer, David Hohn, Markus Schumacher, and Valerie Lang — Albert-Ludwigs-Universität Freiburg

The measurement of Simplified Template Cross Sections (STXS) is a strategy to study the Higgs boson at the LHC. The measurements of the signal strength µ and coupling modifiers κ used in Run 1 make use of assumptions, such as the Standard Model kinematics or extrapolating from the measured phase space to the global phase space. These assumptions introduce theoretical uncertainties on the determined results and dependencies on the underlying physics model. The STXS technique allows the reduction of theory dependencies in a systematic way, which are directly folded into the measurements. It provides more finely-grained measurements of cross sections in well-defined phase-space regions. These measurements will benefit from the global combination of the measurements in all decay channels and the higher cross section for the Higgs boson production at √s=13 TeV in Run 2. Furthermore, the common definition used by the ATLAS and CMS experiments will simplify a combination across them. This talk will focus on the optimization of the H→ττ decay channel analysis strategy of the ATLAS experiment for the full Run 2 data set. These measurements form an important input to combined STXS results, in particular for vector boson fusion and high transverse momentum topologies.