Probing new physics in semileptonic Σb and Ωb decays

2020/09/21 by Jin-Huan Sheng, Jie Zhu, Xiaonan Li +3
Physics and Astronomy · #Baryon #Branching fraction #Coupling (piping) #Electron #Hadron #Lepton #Neutrino Physics Research #Nuclear physics #Omega #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Semileptonic decay #hep-ph

paper · pdf · doi:10.1103/physrevd.102.055023

published as Phys. Rev. D 102, 055023 (2020) · 11 pages 4 figures Accept by PRD

arxiv created 2020/09/21 · openalex created_date 2020/09/25 · openalex publication_date 2020/09/30 · arxiv updated 2020/10/07 · openalex updated_date 2026/08/05

Abstract

Recently, several hints of lepton nonuniversality have been observed in the semileptonic B meson decays in terms of both in the neutral current (b\ensuremath→sll) and charged current (b\ensuremath→cl\ensuremathν_l) transitions. Motivated by these inspiring results, we perform the analysis of the baryon decays \mathrm\ensuremathΣ_b\ensuremath→\mathrm\ensuremathΣ_cl\ensuremathν_l and \mathrm\ensuremathΩ_b\ensuremath→\mathrm\ensuremathΩ_cl\ensuremathν_l(l=e,\ensuremathμ,\ensuremathτ) which are mediated by b\ensuremath→cl\ensuremathν_l transitions at the quark level, to scrutinize the nature of new physics (NP) in the model independent method. We first use the experimental measurements of B(B\ensuremath→D^(*)l\ensuremathν_l), R_D^(*) and R_J/\ensuremathψ to constrain the NP coupling parameters in a variety of scenarios. Using the constrained NP coupling parameters, we report numerical results on various observables related to the processes \mathrm\ensuremathΣ_b\ensuremath→\mathrm\ensuremathΣ_cl\ensuremathν_l and \mathrm\ensuremathΩ_b\ensuremath→\mathrm\ensuremathΩ_cl\ensuremathν_l, such as the branching ratios, the ratio of branching fractions, the lepton side forward-backward asymmetries, the hadron and lepton longitudinal polarization asymmetries and the convexity parameter. We also provide the q² dependency of these observables and we hope that the corresponding numerical results in this work will be testified by future experiments.

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