Implications of Heavy Quark Spin Symmetry and NRQCD on Bc → J/ψ, ηc form factors
Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via Orabona 4, 70126 Bari, Italy
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Published online: 17 November 2022
We discuss the analysis of Bc → J/ψ, ηc form factors, based on the heavy quark spin symmetry and nonrelativistic QCD (NRQCD) performed in Ref. . We perform an expansion on the inverse of the heavy quarks’ masses using power counting rules of NRQCD up to the next-to-leading order. This allows us to classify the heavy quark spin symmetry-breaking terms and express the form factors in terms of universal functions in a selected kinematical range. Using as input the lattice QCD results for the Bc → J/ψ matrix element of the SM operator, we obtain information on other form factors.
© The Authors, published by EDP Sciences, 2022
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