The B → D ∗ ℓν semileptonic decay at nonzero recoil and its implications for | V cb | and R(D ∗ ) Alejandro Vaquero Avilés-Casco * Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112-0830, USA E-mail: alexvaq@physics.utah.edu Carleton DeTar Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112-0830, USA E-mail: detar@physics.utah.edu Aida X. El-Khadra Department of Physics, University of Illinois, Urbana, IL 61801-3080, USA and Fermi National Accelerator Laboratory, Batavia, IL 60510-5011, USA E-mail: axk@illinois.edu Andreas S. Kronfeld Fermi National Accelerator Laboratory, Batavia, IL 60510-5011, USA E-mail: ask@fnal.gov Jack Laiho Department of Physics, Syracuse University, Syracuse, NY 13244-1130, USA E-mail: jwlaiho@syr.edu Ruth S. Van de Water Fermi National Accelerator Laboratory, Batavia, IL 60510-5011, USA E-mail: ruthv@fnal.gov (Fermilab Lattice and MILC Collaborations) We present nearly final results from our analysis of the form factors for B → D ∗ ℓν decay at nonzero recoil. Our analysis includes 15 MILC asqtad ensembles with N f = 2 + 1 flavors of sea quarks and lattice spacings ranging from a ≈ 0.15 fm down to 0.045 fm. The valence light quarks employ the asqtad action, whereas the b and c quarks are treated using the Fermilab action. We discuss the impact that our results will have on | V cb | and R(D ∗ ). 37th International Symposium on Lattice Field Theory - Lattice2019 16-22 June 2019 Wuhan, China * Speaker. c  Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). https://pos.sissa.it/ arXiv:1912.05886v1 [hep-lat] 12 Dec 2019