First Evidence of New Physics in b <--> s Transitions

TL;DR

This paper presents the first evidence of physics beyond the Standard Model in Bs meson mixing, showing a significant deviation in the mixing phase based on combined experimental data.

Contribution

It combines recent experimental results on Bs mixing to provide the first evidence of new physics beyond the Standard Model, challenging models with Minimal Flavour Violation.

Findings

Bs mixing phase deviates >3 sigma from SM prediction

Combined data shows consistent deviation across measurements

Disfavors Minimal Flavour Violation models

Abstract

We combine all the available experimental information on Bs mixing, including the very recent tagged analyses of Bs to J/Psi phi by the CDF and D0 collaborations. We find that the phase of the Bs mixing amplitude deviates more than 3 sigma from the Standard Model prediction. While no single measurement has a 3 sigma significance yet, all the constraints show a remarkable agreement with the combined result. This is a first evidence of physics beyond the Standard Model. This result disfavours New Physics models with Minimal Flavour Violation with the same significance.