Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Higgs: Decay into fermions II

T 70.6: Talk

Thursday, April 2, 2020, 17:45–18:00, H-HS I

CP Violation in Higgs Boson Decays into two Tau Leptons with the CMS Experiment — Mate Farkas, Olena Hlushchenko, Wolfgang Lohmann, Dennis Roy, Hale Sert, Sebastian Siebert, Achim Stahl, Lucas Wiens, and •Alexander Zotz — III. Physikalisches Institut B, RWTH Aachen University, Germany

Ever since the observation of the Higgs boson decay into a pair of tau leptons in 2016 by ATLAS and CMS, measurements of the structure of fermionic couplings have been made possible. Many of the Higgs boson’s quantum numbers have been determined already, yet the full picture of its CP nature is unclear. The angle between the decay planes of the tau lepton decay products in the H→ττ decay is a suitable observable to differentiate between different CP hypotheses including an admixture of odd and even states giving rise to CP violation.

In this talk, an analysis is presented to measure a CP mixing angle in fermionic Higgs boson decays via two tau leptons with the CMS experiment and in addition an estimation of the expected sensitivity for the data of Run 2 of the LHC is given.