Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 60: Top Quarks: Decay and CP Violation and Mixing Angles

T 60.7: Talk

Wednesday, March 23, 2022, 17:45–18:00, T-H19

Search for B_s⁰ → D^*+D^*− and CP violation studies in B_d⁰ → D^*+D^*− with the LHCb experiment — Sophie Hollitt, Philipp Ibis, •Jan Langer, and Antje Mödden — Experimentelle Physik 5, TU Dortmund

At the LHCb experiment, precision measurements are performed to search for physics beyond the Standard Model. For this purpose, e.g. searches for unobserved decays and measurements of their branching fractions or measurements of CP violation in decays of neutral B mesons are carried out.

The primary aim of this analysis is to observe the decay B_s⁰ → D^*+D^*−. Besides, the branching fraction is measured relative to the decay B_d⁰ → D^*+D^*−. By measuring the relative branching ratio, dominant systematic uncertainties cancel out. Further, an angular and decay-time dependent CP violation measurement is performed in the B_d⁰ → D^*+D^*− decay, which allows the measurement of the parameter sin(2β).

In this talk, the current status of both analyses is presented using the full data set of the LHCb experiment corresponding to an integrated luminosity of 9 fb⁻¹.