Measurements of CPT Violation at LHCb

J Van Tilburg

doi:10.1142/9789813148505_0019

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.

Highlights

The LHCb detector 1,2 is a single-arm forward spectrometer designed for the study of heavy flavor hadrons
Violation of CPT symmetry implies a breaking of Lorentz invariance in a local, interacting quantum field theory.[4]
Strong constraints on the StandardModel Extension (SME) coefficients have been made using data from KLOE, KTeV and E773.9 It will be difficult for LHCb to compete with these dedicated kaon experiments due to the lower statistics and worse kaon lifetime acceptance

Summary

Introduction

The LHCb detector 1,2 is a single-arm forward spectrometer designed for the study of heavy flavor hadrons. Many results have been published by the LHCb collaboration, in particular on CP violation in decays of b and c hadrons. Until recently LHCb had made no measurements on CPT violation in these decays. In these proceedings, a new result[3] from the LHCb collaboration on CPT violation in. Model Extension (SME) is an effective field theory, where CPT- and Lorentz-violating terms are added to the Standard-Model lagrangian.[5,6]. This framework provides the experimental opportunity to measure the coupling coefficients in these terms. In the last 15 years, more searches have been performed within the SME framework, placing tight constraints

Formalism of CPT violation in neutral-meson systems

Measurements at LHCb

Findings

Summary and outlook