Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 3: Higgs I

T 3.4: Talk

Monday, March 19, 2018, 16:45–17:00, Philo-HS3

Measurements of Simplified Template Cross Sections in the H→ττ decay channel — •Fabian Becherer, Elias Coniavitis, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg

The measurement of Simplified Template Cross Sections (STXS) is a new 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. First results have been published by ATLAS utilising this technique in the H→ZZ^*→4l and H→γγ decay channel in 2017. This talk will present the first implementation of this technique in the H→ττ decay channel at the ATLAS experiment. This will form an important input to combined ATLAS STXS results, in particular for vector boson fusion and high transverse momentum topologies.