Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 73: Higgs-Boson 6 (Zerfälle in Tau-Leptonen)

T 73.5: Vortrag

Mittwoch, 29. März 2017, 17:45–18:00, JUR 3

Data-driven estimation of backgrounds with jets misidentified as hadronic τ decays in the semileptonic Higgs decay-channel H→τ_hadτ_lep at the ATLAS experiment. — •Fabian Becherer, Elias Coniavitis, Dirk Sammel, and Markus Schumacher — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Germany

The discovery of a Higgs boson in 2012 at the LHC has led to studies aiming to measure the properties of this new particle, including its coupling to Standard Model particles. The most accessible way to measure the Higgs boson’s couplings to leptons is to study its decay into a pair of τ-leptons. Analysis of the full LHC Run 1 data collected by the ATLAS detector already provided evidence for this decay channel. The large integrated luminosity and the increased signal cross section at √s=13 TeV of the LHC Run 2 are expected to enable a 5σ observation of H→ττ decays at the ATLAS experiment. This talk will discuss the analysis in the case where one τ decays leptonically and the other hadronically based on 36 fb⁻¹ of data collected in pp-collisions in 2015 and 2016. In particular, it will focus on the data-driven estimation of background processes with a jet misidentified as a hadronically-decaying τ-jet, which are very important in this channel. This estimate is obtained using events with an inverted identification requirement on the τ-jet, extrapolated to the signal region using process-dependent fake-factors, measured in separate control regions for each background process and signal category.