Form factors and branching fraction calculations for Bs→Ds(∗)ℓ+νℓ in view of LHCb observation
Soni N.R. Issadykov A. Gadaria A.N. Tyulemissov Z. Patel J.J. Pandya J.N.
February 2023Springer Science and Business Media Deutschland GmbH
European Physical Journal Plus
2023#138Issue 2
In light of the LHCb observations about the Bs→Ds(∗)ℓνℓ semileptonic decays, we study these channels within the standard model framework of covariant confined quark model. The necessary transition form factors are computed in the entire dynamical range of momentum transfer squared with built-in infrared confinement. Our computed ratios of the decay widths from tau mode to muon mode for Ds and Ds∗ mesons are found to be R(Ds) = 0.271 ± 0.069 and R(Ds∗)=0.240±0.038. We further determine the ratio of the decay width from Ds and Ds∗ channel for muon mode Γ(Bs→Dsμ+νμ)/Γ(Bs→Ds∗μ+νμ)=0.451±0.093. Our results are in excellent agreement with the data from the latest LHCb experiments as well as lattice quantum chromodynamics simulations. We also compare the shape of differential decay distribution for Bs→Ds∗μ+νμ with the LHCb data, and our results are in very good agreement throughout all the individual bins. Some other physical observables such as forward-backward asymmetry and longitudinal polarizations of leptons in the final state are also computed.
Text of the article Перейти на текст статьи
Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Gujarat, Vadodara, 390002, India
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
The Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Almaty, 050032, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Applied Physics Department, Faculty of Technology and Engineering, The Maharaja Sayajirao University of Baroda, Gujarat, Vadodara, 390001, India
Department of Physics, Sardar Patel University, Vallabh Vidyanagar, 388120, India
Department of Physics
Bogoliubov Laboratory of Theoretical Physics
The Institute of Nuclear Physics
Al-Farabi Kazakh National University
Applied Physics Department
Department of Physics
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026