B→Dlν form factors at nonzero recoil and extraction of |Vcb|

Na, H., Bouchard, C. M. , Lepage, G. P., Monahan, C. and Shigemitsu, J. (2015) B→Dlν form factors at nonzero recoil and extraction of |Vcb|. Physical Review D, 92(5), 054510. (doi: 10.1103/PhysRevD.92.054510)

Abstract

We present a lattice QCD calculation of the B→Dlν semileptonic decay form factors f+(q2) and f0(q2) for the entire physical q2 range. Nonrelativistic QCD bottom quarks and highly improved staggered quark charm and light quarks are employed together with Nf=2+1 MILC gauge configurations. A joint fit to our lattice and BABAR experimental data allows an extraction of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|. We also determine the phenomenologically interesting ratio R(D)=B(B→Dτντ)/B(B→Dlνl) (l=e,μ). We find |Vcb|B→Dexcl=0.0402(17)(13), where the first error consists of the lattice simulation errors and the experimental statistical error and the second error is the experimental systematic error. For the branching fraction ratio we find R(D)=0.300(8).

• Item Type: Articles
• Additional Information: A correction to this article is available at https://doi.org/10.1103/PhysRevD.93.119906.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Bouchard, Dr Chris
• Authors: Na, H., Bouchard, C. M., Lepage, G. P., Monahan, C., and Shigemitsu, J.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 1550-7998
• ISSN (Online): 1550-2368
• Copyright Holders: Copyright © 2015 American Physical Society
• First Published: First published in Physical Review D 92(5): 054510
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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