Year: 2021
Type: article
Abstract: A symmetry-preserving regularisation of a vector $$\times $$ × vector contact interaction (SCI) is used to deliver a unified treatment of semileptonic transitions involving $$\pi $$ π ,K, $$D_{(s)}$$ D(s) , $$B_{(s,c)}$$ B(s,c) initial states. The framework is characterised by algebraic simplicity, few parameters, and the ability to simultaneously treat systems from Nambu–Goldstone modes to heavy+heavy mesons. Although the SCI form factors are typically somewhat stiff, the results are comparable with experiment and rigorous theory results. Hence, predictions for the five unmeasured $$B_{s,c}$$ Bs,c branching fractions should be a reasonable guide. The analysis provides insights into the effects of Higgs boson couplings via current-quark masses on the transition form factors; and results on $$B_{(s)}\rightarrow D_{(s)}$$ B(s)→D(s) transitions yield a prediction for the Isgur–Wise function in fair agreement with contemporary data.
Source: The European Physical Journal C
Institution: Nanjing University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G309532946, G5134557385, G7705497243
OpenAlex ID: W3144130240