New Physics contribution to $B \to K \pi$ decays in SCET

TL;DR

This paper investigates the discrepancy in CP asymmetries of B meson decays within SCET, concluding the Standard Model cannot explain it and exploring supersymmetric models as potential explanations.

Contribution

It demonstrates that the Standard Model cannot account for the observed CP asymmetry difference and identifies conditions for New Physics models, specifically minimal supersymmetry with non-minimal flavor violation.

Findings

Standard Model cannot produce the observed CP asymmetry difference.

Certain New Physics models, like non-minimal flavor violation in supersymmetry, can explain the data.

Classification of requirements for New Physics models to account for experimental results.

Abstract

We analyze the $5\sigma$ difference between the CP asymmetries of the $B^0 \to K^+ \pi^-$ and $B^+ \to K^+ \pi^0$ decays within the Soft Collinear Effective Theory. We find that in the Standard Model, such a big difference cannot be achieved. We classify then the requirements for the possible New Physics models, which can be responsible for the experimental results. As an example of a New Physics model we study minimal supersymmetric models, and find that the measured asymmetry can be obtained with non-minimal flavor violation.