New limits on CPT-Symmetry Violation in Charm mesons

TL;DR

This paper discusses new experimental constraints on CPT symmetry violation in charm mesons, achieved through reinterpretation of LHCb data, significantly improving previous bounds and exploring future testing prospects.

Contribution

It introduces a novel reinterpretation of LHCb measurements to set tighter bounds on CPT violation in charm mesons, advancing the precision of fundamental symmetry tests.

Findings

Constraints on CPT violation are improved by about two orders of magnitude.

Reinterpretation of existing data enables more sensitive tests of CPT symmetry.

Discussion of future prospects within the Standard Model Extension framework.

Abstract

Neutral flavour meson oscillations are a fascinating quantum phenomenon that allows for high-precision tests of fundamental symmetries, including CPT invariance. In this contribution, we present the methodology for testing CPT violation in neutral flavour meson systems, with particular emphasis on the charm sector. We report the recently established constraints on CPT-violating effects, derived from a reinterpretation of the LHCb measurement of the time-dependent asymmetry in the Cabibbo-favoured decays $D^0 \to K^- \pi^+$ and $\bar{D}^0 \to K^+ \pi^-$. Our results improve the previous bounds by the FOCUS experiment by approximately two orders of magnitude. We also discuss prospects for tests of CPT invariance, including the Standard Model Extension framework.