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Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B<sup>+</sup>→ J/ψπ<sup>+</sup>and B<sup>+</sup>→ J/ψK<sup>+</sup>

Journal of High Energy Physics 2017 (2017)

R Aaij, B Adeva, M Adinolfi, Z Ajaltouni, S Akar, J Albrecht, F Alessio, M Alexander, S Ali, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, S Amerio, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, JE Andrews, RB Appleby, F Archilli, P d Argent, J Arnau Romeu, A Artamonov, M Artuso, E Aslanides, G Auriemma, M Baalouch, I Babuschkin, S Bachmann, JJ Back, A Badalov, C Baesso, S Baker, V Balagura, W Baldini, RJ Barlow, C Barschel, S Barsuk, W Barter, M Baszczyk, V Batozskaya, B Batsukh, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, LJ Bel, V Bellee, N Belloli, K Belous, I Belyaev, E Ben-Haim, G Bencivenni, S Benson, A Berezhnoy, R Bernet, A Bertolin, C Betancourt, F Betti, MO Bettler, M van Beuzekom, I Bezshyiko, S Bifani, P Billoir, T Bird, A Birnkraut, A Bitadze, A Bizzeti, T Blake, F Blanc, J Blouw, S Blusk, V Bocci, T Boettcher, A Bondar, N Bondar, W Bonivento, I Bordyuzhin, A Borgheresi, S Borghi, M Borisyak, M Borsato, F Bossu, M Boubdir, TJV Bowcock, E Bowen, C Bozzi, S Braun

© 2017, The Author(s). The ratio of branching fractions and the difference in CP asymmetries of the decays B + → J/ψπ + and B + → J/ψK + are measured using a data sample of pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 3 fb −1 at centre-of-mass energies of 7 and 8 TeV. The results are (Formula presented.) where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of A C P (B + → J/ ψK + ) provides the most precise estimate to date of CP violation in the decay B + → J/ψπ + , (Formula presented.).


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