Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 4: Quark mixing and CP violation

T 4.1: Talk

Monday, March 15, 2021, 16:00–16:15, Td

Reconstruction of tau lepton decay planes for analysing the Higgs CP at CMS — Mate Farkas², Olena Hluschenko², Wolfgang Lohman^1,2, Dennis Roy², Hale Sert², Sebastian Siebert², Achim Stahl², •Lucas Wiens^1,2, and Alexander Zotz² — ¹Deutsches Elektronen-Synchrotron (DESY), Hamburg — ²III. Physikalisches Institut B, RWTH Aachen University, Germany

One of the three Sakharov conditions states that CP violation is needed to explain the matter-antimatter symmetry in our universe. In order to find more occurances of CP violation, the Higgs Boson is now being investigated, so one can find out whether or not it is the CP-even Higgs Boson of the Standard Model or if it is in a mixed state of CP-even and CP-odd and a gateway to new physics. This analysis uses the Run 2 data of 2017 collected by the CMS detector corresponding to an integrated luminosity of 41.5fb⁻¹ in proton-proton collisions with a centre-of-mass energy of 13TeV. Selecting events with a Higgs Boson decaying into a pair of tau leptons, one will find that the tracks of the tau daughters do not intersect with the interaction point. The minimal distance of such a displaced track and the interaction point is called an impact parameter and can be used in conjunction with the daughter particles momentum to reconstruct the decay plane for each tau lepton. The angle between these two planes is sensitive to the Higgs CP and thus it is vital to select well reconstructed impact parameters.