Measurement of C P Violation in the Decay B + → K + π 0

K. De Bruyn, C. J. G. Onderwater, M. van Veghel, LHCb Collaboration

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A measurement of CP violation in the decay B+→K+π0 is reported using data corresponding to an integrated luminosity of 5.4  fb−1 collected with the LHCb experiment at a center-of-mass energy of √s=13  TeV. 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 B0→K+π− and B+→K+π0 decays, known as the Kπ puzzle.

Original languageEnglish
Article number091802
Number of pages11
JournalPhysical Review Letters
Issue number9
Publication statusPublished - 2-Mar-2021

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