Philippe d'Argent: Beautiful mixing and CP violation at LHCb

Friday 28 May 2021, 12:30 → 14:00 Europe/London

https://zoom.us/j/304578256

Precision measurements of beauty hadron decays are sensitive probes of the Standard Model and a promising way to look for new physics phenomena far beyond the energy scale accessible for direct production searches. A key consistency test of the Standard Model is to verify the unitarity of the CKM quark-mixing matrix. For this purpose, the precise determination of the CKM angle γ is essential since it can be accessed by both tree-level and loop-level transitions, the latter being more susceptible to new physics phenomena.

This talk reviews recent measurements of mixing and CP violation in beauty decays performed at the LHCb experiment with an emphasis on the time-dependent analysis of B_s -> D_s K pi pi decays.  In these decays, sensitivity to the CKM angle γ arises through CP violation in the interference of mixing and decay amplitudes. An amplitude (or Dalitz plot) analysis is crucial in order to determine the strong phase difference as function of the 5D phase space, ultimately allowing to separate the weak and strong phase contributions.

Connections will begin at 12:30 with the seminar beginning at 13:00. Password for Zoom is NielsBohr.

dargent_manchester.pdf