Measurement of the CP -even fraction of D0→K+K−π+π−

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Z Zhao ,P C Jiang ,X L Kang ,Y T Liang ,Y Huang ,X S Qin ,Z H Lu ,Z J Chen ,S X Du ,F H Liu ,D H Zhang ,L Z Liao ,Y L Xiao ,Y P Lu ,J Y Zhang ,H H Zhang ,Y Zhu ,W M Song ,Weizhong Liu ,Lei Zhang

doi:10.1103/physrevd.107.032009

Abstract

A determination of the CP-even fraction F+ in the decay D0→K+K−π+π− is presented. Using 2.93 fb−1 of e+e−→ψ(3770)→DD¯ data collected by the BESIII detector, one charm meson is reconstructed in the signal mode and the other in a CP eigenstate or the decay D→KS,L0π+π−. Analysis of the relative rates of these double-tagged events yields the result F+=0.730±0.037±0.021, where the first uncertainty is statistical and the second is systematic. This is the first model-independent measurement of F+ in D0→K+K−π+π− decays.Received 15 December 2022Accepted 24 January 2023DOI:https://doi.org/10.1103/PhysRevD.107.032009Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasParticle mixing & oscillationsPropertiesCP symmetryParticles & Fields

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