2018/08/31 by Wei Wang, Ruilin Zhu · 2 citations
Physics and Astronomy · #B meson #Branching fraction #Flavor #Lepton #Meson #Neutrino Physics Research #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Unitary state #Universality (dynamical systems) #hep-ex #hep-ph
paper · pdf · doi:10.1142/s0217751x19501951
published as International Journal of Modern Physics A,Vol. 34 (2019),1950195 · 18pages, 7 figures, and 3 tables; update new contents
openalex created_date 2018/09/07 · arxiv created 2019/06/10 · openalex publication_date 2019/11/10 · arxiv updated 2019/11/28 · openalex updated_date 2026/08/05
Experimental measurements of decay branching fractions of semitaunic and semimuonic [Formula: see text] into [Formula: see text] have challenged the lepton flavor universality in standard models with about two standard deviations. In this paper, we first investigate the unitary constraint on form factors of [Formula: see text] meson into [Formula: see text]-wave and [Formula: see text]-wave charmonium. Such constraint leads to the exploration of the [Formula: see text] and other ratios [Formula: see text], [Formula: see text], and [Formula: see text] in a model-independent way. These results together with future experimental measurements can be used to explore the lepton flavor universality in a more systematic way. In addition, we point out that the helicity-dependent ratios [Formula: see text] and [Formula: see text] can also provide complementary information.