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. © 2016, The Author(s).

Erratum to: Measurements of the S-wave fraction in B0 → K+π−μ− decays and the B0 → K∗(892)0 μ+μ− differential branching fraction

Veltri, M.;
2017

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. © 2016, The Author(s).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2666757
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