Semileptonic Bc → ηc,J/ψ transitions
Using a systematic, symmetry-preserving continuum approach to the Standard Model strong-interaction bound-state problem, we deliver parameter-free predictions for all semileptonic Bc→ηc,J/ψ transition form factors on the complete domains of empirically accessible momentum transfers. Working with bra...
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Published in | Physics letters. B Vol. 818; p. 136344 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
10.07.2021
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Using a systematic, symmetry-preserving continuum approach to the Standard Model strong-interaction bound-state problem, we deliver parameter-free predictions for all semileptonic Bc→ηc,J/ψ 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 τ over μ final states are obtained: Rηc=0.313(22) and RJ/ψ=0.242(47). Combined with other recent results, our analysis confirms a 2σ discrepancy between the Standard Model prediction for RJ/ψ and the single available experimental result. |
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ISSN: | 0370-2693 1873-2445 |
DOI: | 10.1016/j.physletb.2021.136344 |