Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 52: CP-Verletzung und Mischungswinkel 2

T 52.2: Vortrag

Dienstag, 28. März 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.