A measurement of CP violation in the decay B+ -> K+pi(0) 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 root 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 B-0 -> K+pi(-) and B+ -> K+pi 0 decays, known as the K pi puzzle.

Aaij, R., Beteta, C.a., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Measurement of CP Violation in the Decay B plus -> K+ pi(0). PHYSICAL REVIEW LETTERS, 126(9) [10.1103/PhysRevLett.126.091802].

Measurement of CP Violation in the Decay B plus -> K+ pi(0)

Adinolfi, M.;Archilli, F.;Carbone, A.;Carboni, G.;Cattaneo, M.;Chen, S.;D'Ambrosio, C.;De Capua, S.;Ferrari, F.;Fontana, M.;Gao, Y.;Li, Y.;Li, Y.;Mariani, S.;Pastore, A.;Petrucci, S.;Santovetti, E.;Vitali, G.;Wang, C.;Wang, J.;Wang, J.;Wang, J.;Wang, J.;Wang, Z.;Zhang, L.;Zhou, Y.;
2021-01-01

Abstract

A measurement of CP violation in the decay B+ -> K+pi(0) 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 root 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 B-0 -> K+pi(-) and B+ -> K+pi 0 decays, known as the K pi puzzle.
2021
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
English
Aaij, R., Beteta, C.a., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Measurement of CP Violation in the Decay B plus -> K+ pi(0). PHYSICAL REVIEW LETTERS, 126(9) [10.1103/PhysRevLett.126.091802].
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