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

A measurement of the phase difference between the short- and long-distance contributions to the B+→K+μ+μ-$${{B} ^+} \!\rightarrow {{{K}} ^+} {\mu ^+\mu ^-} $$ decay is performed by analysing the dimuon mass distribution. The analysis is based on pp collision data corresponding to an integrated lumin