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Measurement of the phase difference between short- and long-distance amplitudes in the $B^+ \to K^+ \mu^+\mu^-$ decay


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Measurement of the phase difference between short- and long-distance amplitudes in the $B^+ \to K^+ \mu^+\mu^-$ decay. European Physical Journal C - Particles and Fields, C77(3):161.

Abstract

A measurement of the phase difference between the short- and long-distance contributions to the $B^+ \to K^+ \mu^+\mu^-$ decay is performed by analysing the dimuon mass distribution. The analysis is based on pp collision data corresponding to an integrated luminosity of 3 fb$^{−1}$ collected by the LHCb experiment in 2011 and 2012. The long-distance contribution to the $B^+ \to K^+ \mu^+\mu^-$ decay is modelled as a sum of relativistic Breit–Wigner amplitudes representing different vector meson resonances decaying to muon pairs, each with their own magnitude and phase. The measured phases of the $J/\psi$ and $\psi(2S)$ resonances are such that the interference with the short-distance component in dimuon mass regions far from their pole masses is small. In addition, constraints are placed on the Wilson coefficients, $\mathcal{C}_9$ and $\mathcal{C}_{10}$, and the branching fraction of the short-distance component is measured.

Abstract

A measurement of the phase difference between the short- and long-distance contributions to the $B^+ \to K^+ \mu^+\mu^-$ decay is performed by analysing the dimuon mass distribution. The analysis is based on pp collision data corresponding to an integrated luminosity of 3 fb$^{−1}$ collected by the LHCb experiment in 2011 and 2012. The long-distance contribution to the $B^+ \to K^+ \mu^+\mu^-$ decay is modelled as a sum of relativistic Breit–Wigner amplitudes representing different vector meson resonances decaying to muon pairs, each with their own magnitude and phase. The measured phases of the $J/\psi$ and $\psi(2S)$ resonances are such that the interference with the short-distance component in dimuon mass regions far from their pole masses is small. In addition, constraints are placed on the Wilson coefficients, $\mathcal{C}_9$ and $\mathcal{C}_{10}$, and the branching fraction of the short-distance component is measured.

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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:2017
Deposited On:02 Feb 2018 14:40
Last Modified:23 Sep 2018 06:13
Publisher:Springer
ISSN:1434-6044
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-017-4703-2

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