Shedding New Light on ${\cal R} (D_{(s)}^{(\ast)} )$ and $|V_{cb}|$ from Semileptonic $\bar B_{(s)} \to D_{(s)}^{(\ast)} \ell \bar {\nu}_{\ell}$ Decays

Autor:	Cui, Bo-Yan, Huang, Yong-Kang, Wang, Yu-Ming, Zhao, Xue-Chen
Rok vydání:	2023
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice
Druh dokumentu:	Working Paper
Popis:	We compute for the first time the next-to-leading-order QCD corrections to the $\bar B_{(s)} \to D_{(s)}^{(\ast)}$ 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-flavour-universality ratios ${\cal R} (D^{(\ast)})$ significantly. Comment: 6 pages plus Supplemental Material, 3 figures, 1 table, 2 ancillary files
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2301.12391 Zobrazit plný text záznamu View this record from Arxiv