## Abstract

A measurement of the differential branching fraction of the decay B
^{0} → K
^{∗}(892)
^{0}μ
^{+}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)
^{0}μ
^{+}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
_{Kπ}< 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)
^{0}μ
^{+}μ
^{−} decays is determined to be dℬ/dq
^{2}=(0.392
_{−0.019}
^{+0.020}(stat)±0.010(syst)±0.027(norm))×10
^{−7}c
^{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 language | English |
---|---|

Article number | 47 |

Journal | Journal of High Energy Physics |

Volume | 2016 |

Issue number | 11 |

DOIs | |

Publication status | Published - 1 Nov 2016 |

Externally published | Yes |

### 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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Dive into the research topics of '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'. Together they form a unique fingerprint.