Journal
PHYSICS LETTERS B
Volume 818, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2021.136344
Keywords
Heavy-quark mesons; Semileptonic decays; Charmonia; CKM matrix elements; Emergence of hadron mass; Schwinger function methods
Funding
- Nanjing University Innovation Programme for PhD candidates
- National Natural Science Foundation of China [11805097]
- Jiangsu Provincial Natural Science Foundation of China [BK20180323]
- STRONG-2020 The strong interaction at the frontier of knowledge: fundamental research and applications from European Union's Horizon 2020 research and innovation programme
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Using a systematic, symmetry-preserving continuum approach, parameter-free predictions were made for all semileptonic B-c -> eta(c), J/psi transition form factors. The study confirms a 2 sigma discrepancy between the Standard Model prediction for R-J/psi and the single available experimental result.
Using a systematic, symmetry-preserving continuum approach to the Standard Model strong-interaction bound-state problem, we deliver parameter-free predictions for all semileptonic B-c -> eta(c), J/psi transition form factors on the complete domains of empirically accessible momentum transfers. Working with branching fractions calculated therefrom, the following values of the ratios for tau over mu final states are obtained: R-eta c = 0.313(22) and R-J/psi = 0.242(47). Combined with other recent results, our analysis confirms a 2 sigma discrepancy between the Standard Model prediction for R-J/psi and the single available experimental result. (C) 2021 The Author(s). Published by Elsevier B.V.
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