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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/186421
Measurement of the phase difference between short- and long-distance amplitudes in the B+→K+μ+μ- decay
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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 C_{10}, and the branching fraction of the short-distance component is measured.
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BARTER, W., et al. Measurement of the phase difference between short- and long-distance amplitudes in the B+→K+μ+μ- decay. European Physical Journal C. 2017. Vol. 77, num. 161, pags. 15. ISSN 1434-6044. [consulted: 11 of August of 2026]. Available at: https://hdl.handle.net/2445/186421