Bc→J/ψ tensor form factors at large momentum recoil.

We present a next-to-leading order (NLO) relativistic correction to B c → J / ψ tensor form factors within nonrelativistic QCD (NRQCD). We also consider complete Dirac bilinears c ̄ Γ b with 4 × 4 matrices Γ = 1 , γ 5 , γ μ , γ μ γ 5 , σ μ ν in the b → c transition. The relation among different current form factors is given and it shows that symmetries emerge in the heavy bottom quark limit. For a phenomenological extension, we propose to extract the long-distance matrix elements (LDMEs) for B c meson from the recent HPQCD lattice data and the NLO form factors at large momentum recoil. [ABSTRACT FROM AUTHOR]