Test of Lepton Universality and Measurement of the Form Factors of D 0 → K * ( 892 ) − μ + ν μ
YOU?
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· 2025
· Open Access
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· DOI: https://doi.org/10.1103/physrevlett.134.011803
One 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.
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