Study of CP violation and CPT violation in $K^{\ast}(892)\rightarrow K_{S,L}^{0}\pi$ decays at BESIII

TL;DR

This paper investigates CP and CPT violation in $K^{ ext{*}}(892)$ decays at BESIII, providing expected sensitivities and potential for unambiguous observation with large J/psi samples.

Contribution

It presents the first detailed analysis of CP and CPT violation effects in $K^{ ext{*}}(892)$ decays at BESIII, including sensitivity estimates for future measurements.

Findings

Measured CP asymmetries around 3.6×10^{-3} and -3.3×10^{-3}.

Estimated observable signals for CP violation and $K_S^0-K_L^0$ asymmetry.

Projected sensitivity to CPT violation parameter $z$ at BESIII.

Abstract

The decays $K^{\ast}(892)\rightarrow K_{S,L}^{0}\pi$ can be used to study CP violation and CPT violation. The $K^{\ast}(892)$ (hereinafter referred to as $K^{\ast}$) meson can be produced via $J/\psi$ decays at BESIII. In this paper, we study CP violation and $K_S^0-K_L^0$ asymmetry in the $J/\psi$ decays involving the $K^{\ast}$ meson in the final states and obtain the following results \begin{align} {\mathcal A}_{CP}\left(J/\psi\rightarrow K^{\ast}f_{J/\psi}\rightarrow K^0_{S}\pi f_{J/\psi}\right)=\left(3.64\pm0.04\right)\times 10^{-3},\nonumber\\ {\mathcal A}_{CP}\left(J/\psi\rightarrow K^{\ast}f_{J/\psi}\rightarrow K^0_{L}\pi f_{J/\psi}\right)=\left(-3.32\pm0.04\right)\times 10^{-3},\nonumber \end{align} and \begin{align} &R\left(J/\psi\rightarrow K^{\ast}f_{J/\psi}\rightarrow K^0_{S,L}\pi f_{J/\psi} \right)=\left(3.51\pm0.03\right)\times 10^{-3},\nonumber\\ &R\left(J/\psi\rightarrow \bar{K}^{\ast} \bar{f}_{J/\psi}\rightarrow K^0_{S,L}\pi \bar{f}_{J/\psi} \right)=\left(-3.45\pm0.03\right)\times 10^{-3}.\nonumber \end{align} Basing on two cases: the samples of $10^{10}$ and $10^{12}$ $J/\psi$ events, we calculate the expected numbers of the observed signal events on the CP violation and the $K_S^0-K_L^0$ asymmetry in the $J/\psi$ decays with $K^{\ast}$ meson in the final states, we find that the BESIII experiment may be able to unambiguously observe CP violation and $K_S^0-K_L^0$ asymmetry for each of these two cases. We study the possibility to constraint the CPT violation parameter $z$ and discuss the sensitivity for the measurement of $z$ in $J/\psi$ decays with $K^{\ast}$ meson in the final states at BESIII. The sensitivity of the measurement of $z$ depend on the measured precision of the parameters $m_L-m_S$, $\Gamma_L$, $\Gamma_S$, $p$ and $q$ and the consistence between the values of $t_0$ and $t_1$ and the event selection criteria in experiment.