Measurement of the $CP$-even fraction of ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$

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Measurement of the $C P$ -even fraction of $D^{0} \to K^{+} K^{-} π^{+} π^{-}$

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 107, 032009 – Published 22 February 2023

Abstract

A determination of the $C P$ -even fraction $F_{+}$ in the decay $D^{0} \to K^{+} K^{-} π^{+} π^{-}$ is presented. Using $2.93 {fb}^{- 1}$ of $e^{+} e^{-} \to ψ (3770) \to D \bar{D}$ data collected by the BESIII detector, one charm meson is reconstructed in the signal mode and the other in a $C P$ eigenstate or the decay $D \to K_{S, L}^{0} π^{+} π^{-}$ . Analysis of the relative rates of these double-tagged events yields the result $F_{+} = 0.730 \pm 0.037 \pm 0.021$ , where the first uncertainty is statistical and the second is systematic. This is the first model-independent measurement of $F_{+}$ in $D^{0} \to K^{+} K^{-} π^{+} π^{-}$ decays.

Received 15 December 2022
Accepted 24 January 2023

DOI:https://doi.org/10.1103/PhysRevD.107.032009

Published 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 Society

Physics Subject Headings (PhySH)

Particle mixing & oscillations

CP symmetry

Particles & Fields

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Vol. 107, Iss. 3 — 1 February 2023

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Physical Review D

covering particles, fields, gravitation, and cosmology

Measurement of the $C P$ -even fraction of $D^{0} \to K^{+} K^{-} π^{+} π^{-}$

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 107, 032009 – Published 22 February 2023

Abstract

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Article Text

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Issue

Physical Review D

covering particles, fields, gravitation, and cosmology

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

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. D 107, 032009 – Published 22 February 2023

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Measurement of the $C P$ -even fraction of $D^{0} \to K^{+} K^{-} π^{+} π^{-}$