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.
Test of Lepton Universality and Measurement of the Form Factors of D^0-->K*(892)-\mu^+\nu_\mu
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2025-01-01
Abstract
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.| File | Dimensione | Formato | |
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PhysRevLett.134.011803.pdf
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