Measurement of the phase difference between short- and long-distance amplitudes in the B+→ K+µ+µ− decay

LHCb Collaboration, R Aaij, Marco Adinolfi, Emma Buchanan, Andrew Cook, Jeremy Dalseno, Sam Harnew, James Kariuki, Paras Naik, Konstantinos Petridis, Gabriela Pomery, Eugenia Price, Claire Prouve, Renato Quagliani, Jonas Rademacker, Sophie Richards, Daniel Saunders, Nicola Skidmore, Jaap Velthuis

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Abstract

A measurement of the phase difference between
the short- and long-distance contributions to the B+ →
K +μ+μ− 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+ → K +μ+μ− 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/ψ and ψ(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, C9 and C10,
and the branching fraction of the short-distance component
is measured.
Original languageEnglish
JournalEuropean Physical Journal C: Particles and Fields
Volume77
Issue number161
DOIs
Publication statusPublished - 16 Mar 2017

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  • Projects

    Bristol Consolidated Grant 2015-9

    Goldstein, J.

    1/10/1530/09/20

    Project: Research

    Cite this

    LHCb Collaboration, Aaij, R., Adinolfi, M., Buchanan, E., Cook, A., Dalseno, J., Harnew, S., Kariuki, J., Naik, P., Petridis, K., Pomery, G., Price, E., Prouve, C., Quagliani, R., Rademacker, J., Richards, S., Saunders, D., Skidmore, N., & Velthuis, J. (2017). Measurement of the phase difference between short- and long-distance amplitudes in the B+→ K+µ+µ− decay. European Physical Journal C: Particles and Fields, 77(161). https://doi.org/10.1140/epjc/s10052-017-4703-2