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Measurement of CP Violation in the Decay B+K+π0

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 126, 091802 – Published 2 March 2021

Abstract

A measurement of CP violation in the decay B+K+π0 is reported using data corresponding to an integrated luminosity of 5.4fb1 collected with the LHCb experiment at a center-of-mass energy of s=13TeV. The CP asymmetry is measured to be 0.025±0.015±0.006±0.003, where the uncertainties are statistical, systematic, and due to an external input. This is the most precise measurement of this quantity. It confirms and significantly enhances the observed anomalous difference between the direct CP asymmetries of the B0K+π and B+K+π0 decays, known as the Kπ puzzle.

  • Figure
  • Received 23 December 2020
  • Accepted 28 January 2021
  • Corrected 4 March 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.091802

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.

© 2021 CERN, for the LHCb Collaboration

Physics Subject Headings (PhySH)

Particles & Fields

Corrections

4 March 2021

Correction: The first decay term appearing in the last sentence of the abstract contained an error and has been fixed.

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Issue

Vol. 126, Iss. 9 — 5 March 2021

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