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

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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

Dec 20, 2016

25 pages

Published in:

Eur.Phys.J.C 77 (2017) 3, 161

Published: Mar 16, 2017

e-Print:

1612.06764 [hep-ex]

DOI:

10.1140/epjc/s10052-017-4703-2

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit K}^{+}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}

Report number:

CERN-EP-2016-301,
LHCB-PAPER-2016-045

Experiments:

CERN-LHC-LHCb

View in:

reference search121 citations

Citations per year

Abstract: (Springer)

A measurement of the phase difference between the short- and long-distance contributions to the

{{B} ^+} \!\rightarrow {{{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

\mathrm{\,fb}^{-1}

collected by the LHCb experiment in 2011 and 2012. The long-distance contribution to the

{{B} ^+} \!\rightarrow {{{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.

Note:

23 pages, 4 figures, published in EPJC. All figures and tables, along with any supplementary material and additional information, are available at http://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-045.html

p p: colliding beams
B+: semileptonic decay
muon: pair production
mass spectrum: (muon+ muon-)
dimuon: mass spectrum
mass: pole
p p: scattering
meson resonance
resonance: width
Breit-Wigner

References(55)

Figures(7)

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