Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 82: Higgs IV

T 82.6: Vortrag

Donnerstag, 22. März 2018, 17:50–18:05, Z6 - HS 0.004

Studies for the measurement of Higgs boson production with an additional heavy flavor quark in the final state and H → γ γ at the ATLAS experiment — •Isabel Nitsche, Diane Cinca, Johannes Erdmann, and Kevin Kröninger — TU Dortmund, Lehrstuhl für Experimentelle Physik IV

The production of a Higgs boson with an additional heavy flavor quark in the final state (H+HF), with the main contribution coming from gluon-gluon fusion, is a dominant background in measurements of Higgs boson properties at the ATLAS experiment. An important example is the production of a top-antitop-quark pair in association with a Higgs boson with both top quarks decaying hadronically. As H+HF has not been measured so far and other measurements of processes with additional HF quarks in the final state observed differences between theory predictions and data, a conservative uncertainty of 100% has previously been assigned to it. Hence, the measurement of H+HF would provide a valuable input to these measurements.

A multivariate discriminant, which is designed to identify jets resulting from the decay of a B-hadron, is used to distinguish between events with additional light jets, c-jets and b-jets. In addition, the use of a neural network to discriminate the signal from the large contribution of non-resonant background is studied. A strategy for the measurement of H+HF production using data corresponding to an integrated luminosity of 80 fb⁻¹ is presented.