Summary of hints for new physics from (quark) flavour physics

TL;DR

This paper reviews recent anomalies in quark flavour physics, highlighting potential signs of new physics beyond the Standard Model, especially in B_s mixing, D_s decays, and CP asymmetries, challenging minimal flavour violation.

Contribution

It summarizes current experimental discrepancies and discusses their implications for new physics models beyond minimal flavour violation.

Findings

Discrepancies in B_s mixing phase and D_s decay rates suggest potential new physics.

Significant CP asymmetry differences in B -> K pi decays observed.

Challenges to the minimal flavour violation hypothesis due to these anomalies.

Abstract

Recently two hints for new physics have emerged: The B_s mixing phase phi_s and the rate of D_s -> (mu,tau) nu exposing a discrepancy of \sim 3 sigma and 3.8 sigma deviation from the Standard Model respectively. Moreover the difference of the CP asymmetries in B -> K pi between the charged and neutral modes is at the 5.3 sigma level which is somewhat larger than expected. New physics in phi_s or A_CP(B -> K pi) would be in contradiction with the minimal flavour violation hypothesis. The latter has recently attracted attention because of the absence of deviation in CP and flavour violation in the quark sector.