Ablikim, M.Achasov, M.N.Adlarson, P.Çetin, Serkant AliKolcu, Onur BuğraUman, Igor2025-04-182025-04-182025Ablikim, M., Achasov, M. N., Adlarson, P., Afedulidis, O., Ai, X. C., Aliberti, R., ... & Huang, K. X. (2025). Test of Lepton Universality and Measurement of the Form Factors of D 0→ K*(892)-μ+ ν μ. Physical Review Letters, 134(1), 011803.00319007http://dx.doi.org/10.1103/PhysRevLett.134.011803https://hdl.handle.net/20.500.12713/6969One of the main goals of studying semileptonic decays in flavor physics is to gain a better understanding of hadronic transitions in the nonperturbative region of Quantum Chromodynamics. This involves measuring Cabibbo-Kobayashi-Maskawa matrix elements, understanding form factors, and comparing them with theoretical predictions. We report a first study of the semileptonic decay D0→K-π0μ+νμ by analyzing an e+e- annihilation data sample of 7.93 fb-1 collected at the center-of-mass energy of 3.773 GeV with the BESIII detector. The absolute branching fraction of D0→K-π0μ+νμ is measured for the first time, providing necessary input for extracting the c→s Cabibbo-Kobayashi-Maskawa matrix element through this process. This measurement allows us to test lepton flavor universality, with no indication of violation found. Furthermore, a series of hadronic form factors have been determined and compared with theoretical predictions, which will impose stricter constraints on theoretical models. © 2025 authors. Published by the American Physical Society.eninfo:eu-repo/semantics/openAccessCabibbo-Kobayashi-Maskawa MatrixE+e- AnnihilationFlavor PhysicsForm factorsHadronicsSemileptonic DecayArticle1341399137452-s2.0-8521466318710.1103/PhysRevLett.134.011803Q1