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

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, LA Everse, L. Anderlini, G. Andreassi, M. Andreotti, J.E. AndrewsR. B. Appleby, F. Archilli, P. d’Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, I. Babuschkin, K. Carvalho Akiba, V. Coco, P. N Y David, K. De Bruyn, M. Ferro-Luzzi, T. Ketel, R. F. Koopman, J. van Leerdam, M. Merk, C. J G Onderwater, G. Raven, M. Schiller, N. Serra, H. Snoek, B. Storaci, V. Syropoulos, J. van Tilburg, S. Tolk, P. Tsopelas, N. Tuning, The LHCb collaboration

Research output: Contribution to JournalArticleAcademicpeer-review


The ratio of branching fractions and the difference in CP asymmetries of the decays B+ -> J/psi pi(+) and B+ -> J/psi K+ 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

B(B+ -> J/psi pi(+))/B(B+ -> J/psi K+) = (3.83 +/- 0.03 +/- 0.03) x 10(-2),

A(CP)(B+ -> J/psi pi(+)) - A(CP)(B+ -> J/psi K+) = (1.82 +/- 0.86 +/- 0.14) x 10(-2),

where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of A(CP)(B+ -> J/psi K+) provides the most precise estimate to date of CP violation in the decay B+ -> J/psi pi(+)

A(CP)(B+ -> J/psi pi(+)) = (1.91 +/- 0.89 +/- 0.16) x 10(-2).
Original languageEnglish
Article number036
Pages (from-to)036
Number of pages1
JournalJournal of High Energy Physics
Issue number3
Publication statusPublished - 7 Mar 2017


  • B physics
  • Branching fraction
  • CP violation
  • Hadron-Hadron scattering (experiments)


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