Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 91: Higgs: Htautau (CP und Polarisierung)

T 91.3: Talk

Thursday, March 12, 2015, 17:15–17:30, M.10.12 (HS 14)

Studies of the Higgs CP properties in the τ decay channel with the CMS experiment — Joram Berger², Rene Caspart², Vladimir Cherepanov¹, Fabio Colombo², Günter Flügge¹, Felix Frensch², Raphael Friese², Andrew Gilbert², Bastian Kargoll¹, Thomas Müller², Alexander Nehrkorn¹, Ian M. Nugent¹, •Claudia Pistone¹, Günter Quast², Achim Stahl¹, Benjamin Treiber², Roger Wolf², and Alexander Zozt¹ — ¹III. Physikalisches Institut B, RWTH Aachen University, D-52056 Aachen — ²Institut für Experimentelle Kernphysik (IEKP), KIT

In 2012 the ATLAS and CMS collaborations announced the discovery of a Higgs-like boson with a mass of 125 GeV. Since then, many analyses are working on measurements of its properties to completely unravel the nature of this resonance. We want to focus on the study of the CP couplings of a Higgs boson decaying into tau lepton pairs, since this channel is particularly suited in this respect. Our approach is based on studying the distribution of a signed angle φ_CP^* between the decay planes of the τ’s, whic is sensitive to the Higgs CP properties. However, the expected discrimination power between CP-even and CP-odd on generator level gets worse at the reconstruction level. An investigation of this worsening effect via Monte Carlo studies is presented.