[2109.02223] Study Of CP Violation And CPT Violation In $K ... - ArXiv

High Energy Physics - Phenomenology arXiv:2109.02223 (hep-ph) [Submitted on 6 Sep 2021 (v1), last revised 2 Oct 2021 (this version, v3)] Title:Study of CP violation and CPT violation in $K^{\ast}(892)\rightarrow K_{S,L}^{0}π$ decays at BESIII Authors:Xiao-Dong Cheng, Ru-Min Wang, Xing-Bo Yuan, Xin Zhang View a PDF of the paper titled Study of CP violation and CPT violation in $K^{\ast}(892)\rightarrow K_{S,L}^{0}\pi$ decays at BESIII, by Xiao-Dong Cheng and 3 other authors View PDF

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.

Comments:	23 pages. arXiv admin note: text overlap with arXiv:2107.10683
Subjects:	High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Cite as:	arXiv:2109.02223 [hep-ph]
(or arXiv:2109.02223v3 [hep-ph] for this version)
https://doi.org/10.48550/arXiv.2109.02223 Focus to learn more arXiv-issued DOI via DataCite

Submission history

From: Xiao-Dong Cheng Xiao-Dong Cheng [view email] [v1] Mon, 6 Sep 2021 03:28:30 UTC (14 KB) [v2] Sun, 12 Sep 2021 15:41:32 UTC (14 KB) [v3] Sat, 2 Oct 2021 06:55:09 UTC (17 KB) Full-text links:

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