Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 17: CP-Verletzung / Mischungswinkel

T 17.7: Talk

Monday, March 19, 2018, 17:30–17:45, Z6 - SR 2.007

CP asymmetry measurements in charm and tau decay at Belle — •Daniel Greenwald — TU Muenchen, Physik Department

CP violation is expected to be tiny or non-existent in the decays of charmed mesons and the tau lepton. Measurement of a CP asymmetry significantly larger than zero is a sign of physics beyond the standard model. The CLEO experiment measured a CP asymmetry of the decay of D⁺ to π⁺π⁰ consistent with zero but with a large uncertainty. The BaBar experiment measured a CP asymmetry of the decay of the tau to ν_τK_S π⁰ inconsistent with the standard-model expectation (which stems from CP asymmetry in the kaon sector) at 2.8σ. We present studies of these variables using data from the Belle experiment at KEK, in Tsukuba, Japan: a new measurement of the CP asymmetry for the charm decay and an ongoing study for the measurement of the CP asymmetry for the tau decay.