2024/01/28 by David London, London, David
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2401.15734
openalex publication_date 2024/01/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this talk, I describe a global fit to B → PP decays, where B = \B0, B+, Bs0\ and the pseudoscalar P = \π, K\, under the assumption of flavour SU(3) symmetry [SU(3)F]. It is found that the individual fits to ΔS=0 or ΔS=1 decays are good, but the combined fit is very poor: there is a 3.6σ disagreement with the standard model. (This is quite a bit larger than the anomaly in b → s ℓ+ ℓ- transitions.) This discrepancy can be removed by adding SU(3)F-breaking effects, but 1000% SU(3)F breaking is required, considerably more than the ∼ 20% breaking of fK/fπ- 1. These results are rigorous, group-theoretically -- no theoretical assumptions have been made. But when one adds a single assumption motivated by QCD factorization, the discrepancy grows to 4.4σ. These are the anomalies in hadronic B decays. Although one cannot yet claim that new physics is present, it is clear that something very unexpected is going on.