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T: Fachverband Teilchenphysik

T 25: Flavor II

T 25.1: Vortrag

Dienstag, 21. März 2023, 17:00–17:15, HSZ/0304

Observation of B_s⁰ → D^*+D^*− and CP violation studies in B⁰ → D^*+D^*− with the LHCb experiment — Johannes Albrecht, Sophie Hollitt, and •Jan Langer — TU Dortmund University, Dortmund, Germany

At the LHCb experiment, precision measurements are performed to search for physics beyond the Standard Model. One important area of interest is the field of CP violation. This includes direct measurements of CP violation in decays of neutral B mesons as well as the determination of branching fractions to constrain higher order effects in such measurements.

The B_s⁰ → D^*+D^*− decay was observed with a high significance and its branching fraction was measured relative to the B⁰ → D^*+D^*− decay. Further, the CP violation parameter sin(2β) can be measured by exploiting b → ccd transitions in B⁰ → D^*+D^*− decays, where the phases arise through the interference between the direct decay of the B⁰ meson and the decay after mixing. Due to the topology of the decay, an angular analysis is required.

In this talk, the observation of the B_s⁰ → D^*+D^*− decay and the current status of the CP violation measurement in B⁰ → D^*+D^*− are presented.