Measurement of the phase difference between short- and long-distance amplitudes in the B[superscript +] → K[superscript +]μ[superscript +]μ[superscript -] Decay
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Aaij2017_Article_MeasurementOfThePhaseDifferenc.pdf
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Author(s)
Boettcher, Thomas Julian
Ilten, Philip J
Williams, Michael
Date Issued
March 2017
Journal
The European Physical Journal C
Citation
Aaij, R., B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of the Phase Difference Between Short- and Long-Distance Amplitudes in the B[superscript +] → K[superscript +]μ[superscript +]μ[superscript -] Decay.” The European Physical Journal C 77, no. 3 (March 2017). © 2017, CERN for the benefit of the LHCb collaboration.
Version
Final published version
Abstract
A measurement of the phase difference between the short- and long-distance contributions to the B[superscript +]→K[superscript +]μ[superscript +]μ[superscript -] decay is performed by analysing the dimuon mass distribution. The analysis is based on pp collision data corresponding to an integrated luminosity of 3fb[superscript -1] collected by the LHCb experiment in 2011 and 2012. The long-distance contribution to the B[superscript +]→K[superscript +]μ[superscript +]μ[superscript -] 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(2 S) 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, C[subscript 9] and C[subscript 10], and the branching fraction of the short-distance component is measured.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-017-4703-2
