Measurements of CPT Violation at LHCb

TL;DR

This paper reports precise measurements of CPT violation and Lorentz symmetry breaking in B meson mixing at LHCb, setting new bounds on SME coefficients and advancing tests of fundamental symmetries.

Contribution

The study provides the first high-precision measurements of SME coefficients related to CPT and Lorentz violation in B meson systems at LHCb.

Findings

Significantly improved bounds on SME coefficients.

High-precision measurements enabled by B meson boost.

Confirmation of CPT symmetry within experimental sensitivity.

Abstract

Recent measurements of CPT violation and Lorentz symmetry breaking in $B^0-\bar{B}^0$ mixing and $B^0_s-\bar{B}^0_s$ mixing, obtained from data taken by the LHCb experiment, are highlighted. The results are expressed in terms of the Standard-Model Extension (SME) coefficients, which incorporate both CPT and Lorentz violation. Due to the large boost of the $B$ mesons at LHCb, the SME coefficients can be determined with high precision. The bounds on these coefficients are improved significantly compared to previous measurements.