Future sensitivity to new physics in B_d, B_s and K mixings

TL;DR

This paper evaluates how future experiments like Belle II and LHCb can significantly improve the sensitivity to new physics in B_d, B_s, and K meson mixings, potentially probing higher energy scales.

Contribution

It provides a comprehensive analysis of future sensitivity to new physics in meson mixing, including various scenarios and implications for different models.

Findings

Current limits can be improved by a factor of ~5.

Probing scales up to 20 TeV for tree-level new physics.

Sensitivity to one-loop new physics can reach about 2 TeV.

Abstract

We estimate, in a large class of scenarios, the sensitivity to new physics in B_d and B_s mixings achievable with 50 ab-1 of Belle II and 50 fb-1 of LHCb data. We find that current limits on new physics contributions in both B_{d,s} systems can be improved by a factor of ~5 for all values of the CP violating phases, corresponding to over a factor of 2 increase in the scale of new physics probed. Assuming the same suppressions by CKM matrix elements as those of the standard model box diagrams, the scale probed will be about 20 TeV for tree-level new physics contributions, and about 2 TeV for new physics arising at one-loop. We also explore the future sensitivity to new physics in K mixing. Implications for generic new physics and for various specific scenarios, such as minimal flavor violation, light third-generation dominated flavor violation, or U(2) flavor models are studied.