Search for B_c^+\toπ^+μ^+μ^- decays and measurement of the branching fraction ratio {\cal B}(B_c^+\toψ(2S)π^+)/{\cal B}(B_c^+\to J/ψπ^+)

The first search for nonresonant B_c^+\to\pi^+\mu^+\mu^- decays is reported. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb^{-1}. No evidence for an excess of signal events over background is observed and an upper limit is set... Show more