Precision model-independent bounds from a global analysis of b →caν form factors

Thomas D. Cohen, Henry Lamm, Richard F. Lebed

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We present a model-independent global analysis of hadronic form factors for the semileptonic decays b→câ"ν that exploits lattice-QCD data, dispersion relations, and heavy-quark symmetries. The analysis yields predictions for the relevant form factors, within quantifiable bounds. These form factors are used to compute the semileptonic ratios R(Hc) and various decay-product polarizations. In particular, we find R(Ds∗)=0.20(3) and R(J/ψ)=0.25(3), predictions that can be compared to results of upcoming LHCb measurements. In developing this treatment, we obtain leading-order nonrelativistic QCD results for the nonzero-recoil relations between the Bc+→{J/ψ,ηc} form factors.

Original languageEnglish (US)
Article number094503
JournalPhysical Review D
Issue number9
StatePublished - Nov 13 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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