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 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) 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.
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© 2016, The Author(s).
Copyright 2017 Elsevier B.V., All rights reserved.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics