Simultaneous Measurement of Muon Neutrino νμ Charged-Current Single π+ Production in CH, C, H2O , Fe, and Pb Targets in MINERvA
                        
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            A study of and decays to ( ) is performed using collision data collected by the LHCb experiment during LHC Runs 1–2, corresponding to an integrated luminosity of . The branching fractions for these decays are measured using the decay as a control channel. The decays and are observed for the first time. For decay modes with sufficient signal yields, asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for violation in the decay, interpreted as originating primarily from an asymmetric decay amplitude. The measured asymmetries for other decays are compatible with zero. © 2025 CERN, for the LHCb Collaboration2025CERNmore » « less
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