Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 15: CP-Verletzung und Mischung

T 15.8: Vortrag

Montag, 25. März 2019, 17:50–18:05, S15

Measurement of the decay-time-dependent CP asymmetry in B⁰ → D^*+D⁻ with the LHCb experiment — •Philipp Ibis, Antje Mödden, and Margarete Schellenberg — Experimentelle Physik 5, TU Dortmund

The LHCb experiment searches for physics beyond the Standard Model by performing precision measurements. Among these are decay-time-dependent measurements of CP violation in decays of neutral B mesons.

In B⁰ → D^*+D⁻ decays, CP is violated in the interference of direct decays and decays after mixing of the B⁰ mesons. Time-dependent measurements of decays of initial B⁰ and B⁰ mesons allow the determinaion of the CP asymmetry and give access to the CKM angle β. As this decay entails a Cabibbo-suppressed b→ cc d transition, loop-level Feynman graphs are not additionally suppressed compared to tree-level transitions. Thus, a measurement of CP violation in this channel complements measurements in B⁰ → J/ψ K_S⁰ decays, which involve non-suppressed b→ cc s transitions.

The current status of the analysis is presented using the full LHCb dataset corresponding to an integrated luminosity of 9 fb⁻¹.