Münster 2017 – scientific programme
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T: Fachverband Teilchenphysik
T 52: CP-Verletzung und Mischungswinkel 2
T 52.2: Talk
Tuesday, March 28, 2017, 17:00–17:15, JUR 490
Study of time-integrated CP asymmetry in D0→ h−h+ decays with the LHCb experiment — •Simon Stemmle for the LHCb collaboration — Physikalisches Institut Universität Heidelberg, Deutschland
CP violation in the D meson system is not observed so far and is predicted to be small in the Standard Model. A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→ K−K+ is presented. For this study, the full data sample of proton-proton collisions, recorded with the LHCb experiment in LHC Run 1 is used, corresponding to an integrated luminosity of 3 fb−1. The D0 mesons used for this analysis originate from the decays D*+→ D0π+ and D*−→ D0π−. Thereby, the flavour of the neutral charm meson at production is determined by the charge of the pion. In order to evaluate the additional production and detection asymmetry arising from the D*+ meson and the pion, three Cabibbo-favoured charm meson decays are used as calibration channels.
Former LHCb analysis are combined with this measurement to give a complete picture of time-integrated CP asymmetry in D0→ h−h+ decays. The obtained result is compatible with the hypothesis of no CP violation.