Astroparticle Physics Seminar

Measuring γ with B → P P P Decays

David London

Université de Montréal

The conventional wisdom is that one cannot obtain clean information about the CKM weak phases from 3-body B decays. Recently it was shown that this is not true. In this talk I discuss two ways of cleanly measuring γ with B → PPP decays. One uses an isobar analysis of the B → Kππ and B → KKK Dalitz plots, along with the assumption of flavour SU(3) symmetry. The other uses decays related by U-spin reflection (d ⇔ s), such as B⁰_s → K_Sπ⁺π^- and B⁰_d → K_SK⁺K^-, or B⁰_s → K_SK⁺K^- and B⁰_d→K_Sπ⁺π^-. The theoretical error due to SU(3) or U-spin breaking may be reduced by averaging over the Dalitz plot. Both LHCb and Belle II have made the study of 3-body decays a high priority.

David London is the 2014 recipient of the CAP-TRIUMF Vogt Medal for Contributions to Subatomic Physics