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Bo-Yan Cui, Yong-Kang Huang, Yu-Ming Wang, X. Zhao
Abstract
We compute for the first time the next-to-leading-order QCD corrections to the ${\overline{B}}_{(s)}\ensuremath{\rightarrow}{D}_{(s)}^{(*)}$ form factors at large hadronic recoil. Both the charm-quark-mass- and the strange-quark-mass- dependent pieces can generate the leading-power contributions to these form factors. Including further various power-suppressed contributions, we perform the combined fits of the considered form factors to both our large-recoil theory predictions and the lattice QCD results, thus improving upon the previous determinations of the lepton-flavor-universality ratios $\mathcal{R}({D}^{(*)})$ significantly.
Topics & Concepts
Particle physicsPhysicsQuantum chromodynamicsRecoilLeptonHadronQuarkUniversality (dynamical systems)Nuclear physicsQuantum mechanicsElectronParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsMedical Imaging Techniques and Applications