Measurement of the phase difference between short- and long-distance amplitudes in the B[superscript +] → K[superscript +]μ[superscript +]μ[superscript -] Decay

• Main Authors: Boettcher, Thomas Julian (Contributor), Ilten, Philip J (Contributor), Williams, Michael (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: 2018-12-11T21:15:41Z.
• Subjects: Article
• Online Access: Get fulltext

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.
National Science Foundation (U.S.)