Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 9: Higgs: Erweiterte Modelle
T 9.9: Talk
Monday, March 25, 2019, 18:00–18:15, S07
Search for CP-violation in gluon fusion production of the Higgs boson in H→ τ lepτhad decay at √s=13 TeV with the ATLAS detector — •Daariimaa Battulga, Kathrin Becker, and Markus Schumacher — Physikalisches Institut, Universität Freiburg
CP-violation is one of the necessary Sakharov conditions to explain the observed asymmetry between matter and anti-matter in the universe. The magnitude of the observed CP-violation in the neutral meson sector, as described by the CKM matrix in the Standard Model, is insufficient to explain the observed asymmetry. Hence it is important to search for new sources of CP-violation e.g., in the Higgs boson sector.
A test of CP-invariance of Higgs boson production in gluon fusion in association with two jets is performed exploiting the decay H→τ lep τhad based on proton-proton collision data corresponding to 140 fb−1 collected by the ATLAS experiment. The presentation will discuss the analysis strategy using CP-odd optimal observables and in particular the event selection to isolate the signal from background contributions.