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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Bibliographic Details
Published inPhysics letters. B Vol. 818; p. 136344
Main Authors Yao, Zhao-Qian, Binosi, Daniele, Cui, Zhu-Fang, Roberts, Craig D.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 10.07.2021
Elsevier
Subjects
Charmonia
CKM matrix elements
Emergence of hadron mass
Heavy-quark mesons
Schwinger function methods
Semileptonic decays
Heavy-quark mesons
Emergence of hadron mass
Schwinger function methods
Charmonia
CKM matrix elements
Semileptonic decays
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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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2021.136344