Measurements of the S-wave fraction in B 0 → K + π μ + μ decays and the B 0 → K (892)0 μ + μ differential branching fraction

The LHCb collaboration, 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, L. An, L. Anderlini, G. Andreassi, M. AndreottiJ. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, P. d’Argent, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, A. Bay, L. Beaucourt, J. Beddow, F. Bedeschi, I. Bediaga, L. J. Bel, V. Bellee, N. Belloli, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, A. Bertolin, M. O. Bettler, M. van Beuzekom, 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, S. Borghi, M. Borisyak, M. Borsato, F. Bossu, M. Boubdir, T. J.V. Bowcock, E. Bowen, C. Bozzi, S. Braun, M. Britsch, T. Britton, J. Brodzicka, E. Buchanan, C. Burr, A. Bursche, J. Buytaert, S. Cadeddu, R. Calabrese

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Abstract

A measurement of the differential branching fraction of the decay B 0 → K (892) 0μ +μ is presented together with a determination of the S-wave fraction of the K +π system in the decay B 0 → K +π μ +μ . The analysis is based on pp-collision data corresponding to an integrated luminosity of 3 fb −1 collected with the LHCb experiment. The measurements are made in bins of the invariant mass squared of the dimuon system, q 2. Precise theoretical predictions for the differential branching fraction of B 0 → K (892) 0μ +μ decays are available for the q 2 region 1.1 < q 2< 6.0 GeV 2/c 4. In this q 2 region, for the K +π invariant mass range 796 < m < 996 MeV/c 2, the S-wave fraction of the K +π system in B 0 → K +π μ +μ decays is found to be F S=0.101±0.017(stat)±0.009(syst), and the differential branching fraction of B 0 → K (892) 0μ +μ decays is determined to be dℬ/dq 2=(0.392 −0.019 +0.020(stat)±0.010(syst)±0.027(norm))×10 −7c 4/GeV 2. The differential branching fraction measurements presented are the most precise to date and are found to be in agreement with Standard Model predictions.

Original languageEnglish
Article number47
JournalJournal of High Energy Physics
Volume2016
Issue number11
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016, The Author(s).

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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