Semileptonic form factors for $$B\rightarrow D^*\ell \nu $$ at nonzero recoil from $$2+1$$-flavor lattice QCD: Fermilab Lattice and MILC Collaborations

Bazavov, A.; DeTar, C. E.; Du, D.; El-Khadra, A. X.; Gámiz, E.; Gelzer, Z.; Gottlieb, S.; Heller, U. M.; Kronfeld, A. S.; Laiho, J.; Mackenzie, P. B.; Simone, J. N.; Sugar, R.; Toussaint, D.; Van de Water, R. S.; Vaquero, A.

doi:10.1140/epjc/s10052-022-10984-9

Title: Semileptonic form factors for $$$$B\rightarrow D^*\ell \nu $$$$ at nonzero recoil from $$2+1$$-flavor lattice QCD: Fermilab Lattice and MILC Collaborations

Journal Article · Fri Dec 16 00:00:00 EST 2022 · European Physical Journal. C, Particles and Fields (Online)

DOI:https://doi.org/10.1140/epjc/s10052-022-10984-9· OSTI ID:1905356

Bazavov, A.; DeTar, C. E.; Du, D.; El-Khadra, A. X.; Gámiz, E.; Gelzer, Z.; Gottlieb, S.; Heller, U. M.; Kronfeld, A. S.; Laiho, J.; Mackenzie, P. B.; Simone, J. N.; Sugar, R.; Toussaint, D.; Van de Water, R. S.;

Abstract We present the first unquenched lattice-QCD calculation of the form factors for the decay $$$$B\rightarrow D^*\ell \nu $$$$ $B \to D^{*} ℓ ν$ at nonzero recoil. Our analysis includes 15 MILC ensembles with $$$$N_f=2+1$$$$ $N_{f} = 2 + 1$ flavors of asqtad sea quarks, with a strange quark mass close to its physical mass. The lattice spacings range from $$$$a\approx 0.15$$$$ $a \approx 0.15$ fm down to 0.045 fm, while the ratio between the light- and the strange-quark masses ranges from 0.05 to 0.4. The valence b and c quarks are treated using the Wilson-clover action with the Fermilab interpretation, whereas the light sector employs asqtad staggered fermions. We extrapolate our results to the physical point in the continuum limit using rooted staggered heavy-light meson chiral perturbation theory. Then we apply a model-independent parametrization to extend the form factors to the full kinematic range. With this parametrization we perform a joint lattice-QCD/experiment fit using several experimental datasets to determine the CKM matrix element $$$$|V_{cb}|$$$$ $| V_{cb} |$ . We obtain $$$$\left| V_{cb}\right| = (38.40 \pm 0.68_{\text {th}} \pm 0.34_{\text {exp}} \pm 0.18_{\text {EM}})\times 10^{-3}$$$$ $(V_{cb}) = (38.40 \pm 0 . 68_{th} \pm 0 . 34_{exp} \pm 0 . 18_{EM}) \times 10^{- 3}$ . The first error is theoretical, the second comes from experiment and the last one includes electromagnetic and electroweak uncertainties, with an overall $$$$\chi ^2\text {/dof} = 126/84$$$$ $χ^{2} /dof = 126 / 84$ , which illustrates the tensions between the experimental data sets, and between theory and experiment. This result is in agreement with previous exclusive determinations, but the tension with the inclusive determination remains. Finally, we integrate the differential decay rate obtained solely from lattice data to predict $$$$R(D^*) = 0.265 \pm 0.013$$$$ $R (D^{*}) = 0.265 \pm 0.013$ , which confirms the current tension between theory and experiment.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); SRA (Spain)

Grant/Contract Number:: FG02-13ER41976; SC0009913; AC02-07CH11359; SC0009998; SC0010120; SC0015655; PHY17-19626; PHY14-17805

OSTI ID:: 1905356

Alternate ID(s):: OSTI ID: 1824308

Report Number(s):: FERMILAB-PUB-21-261-T ; FERMILAB-PUB-21/261-T; arXiv:2105.14019; 1141; PII: 10984

Journal Information:: European Physical Journal. C, Particles and Fields (Online), Journal Name: European Physical Journal. C, Particles and Fields (Online) Vol. 82 Journal Issue: 12; ISSN 1434-6052

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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