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Measurements of the S-wave fraction in $B^0 \to K^+\pi^−\mu^+\mu^−$ decays and the $B^0 \to K^∗(892)^0\mu^+\mu^−$ differential branching fraction


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2016). Measurements of the S-wave fraction in $B^0 \to K^+\pi^−\mu^+\mu^−$ decays and the $B^0 \to K^∗(892)^0\mu^+\mu^−$ differential branching fraction. Journal of High Energy Physics, 11:047.

Abstract

A measurement of the differential branching fraction of the decay $K^∗(892)^0\mu^+\mu^−$ is presented together with a determination of the S-wave fraction of the $K^+\pi^−$ system in the decay $B^0 \to K^+\pi^−\mu^+\mu^−$. 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 $B^0 \to K^∗(892)^0\mu^+\mu^−$ 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 $K^+\pi^−$ invariant mass range $796 < m_{K_{\pi}} < 996 MeV/c^2$, the S-wave fraction of the $K^+\pi^−$ system in $B^0 \to K^+\pi^−\mu^+\mu^−$ decays is found to be
$F_S = 0.101 \pm 0.017(stat) \pm 0.009(syst)$,
and the differential branching fraction of $B^0 \to K^∗(892)^0\mu^+\mu^−$ decays is determined to be
$d\mathcal{B}/dq^2 = (0.392^{+0.020}_{−0.019}(stat) \pm 0.010(syst) \pm 0.027(norm)) \times 10^{−7}c^4/GeV^2$.
The differential branching fraction measurements presented are the most precise to date and are found to be in agreement with Standard Model predictions.

Abstract

A measurement of the differential branching fraction of the decay $K^∗(892)^0\mu^+\mu^−$ is presented together with a determination of the S-wave fraction of the $K^+\pi^−$ system in the decay $B^0 \to K^+\pi^−\mu^+\mu^−$. 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 $B^0 \to K^∗(892)^0\mu^+\mu^−$ 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 $K^+\pi^−$ invariant mass range $796 < m_{K_{\pi}} < 996 MeV/c^2$, the S-wave fraction of the $K^+\pi^−$ system in $B^0 \to K^+\pi^−\mu^+\mu^−$ decays is found to be
$F_S = 0.101 \pm 0.017(stat) \pm 0.009(syst)$,
and the differential branching fraction of $B^0 \to K^∗(892)^0\mu^+\mu^−$ decays is determined to be
$d\mathcal{B}/dq^2 = (0.392^{+0.020}_{−0.019}(stat) \pm 0.010(syst) \pm 0.027(norm)) \times 10^{−7}c^4/GeV^2$.
The differential branching fraction measurements presented are the most precise to date and are found to be in agreement with Standard Model predictions.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:26 Jan 2018 14:59
Last Modified:20 Sep 2018 04:28
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP11(2016)047

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