Harrison, J., Davies, C. T.H. and Wingate, M. (2018) Lattice QCD calculation of the B(s) →D*(s)lv form factors at zero recoil and implications for |Vcb|. Physical Review D, 97(5), 054502. (doi: 10.1103/PhysRevD.97.054502)
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Abstract
We present results of a lattice QCD calculation of B → D and Bs → D s axial vector matrix elements with both states at rest. These zero recoil matrix elements provide the normalization necessary to infer a value for the CKM matrix element jVcbj from experimental measurements of B¯ 0 → Dþl−ν¯ and B¯ 0 s → Dþ s l−ν¯ decay. Results are derived from correlation functions computed with highly improved staggered quarks (HISQ) for light, strange, and charm quark propagators, and nonrelativistic QCD for the bottom quark propagator. The calculation of correlation functions employs MILC Collaboration ensembles over a range of three lattice spacings. These gauge field configurations include sea quark effects of charm, strange, and equal-mass up and down quarks. We use ensembles with physically light up and down quarks, as well as heavier values. Our main results are FB→D ð1Þ ¼ 0.895 0.010stat 0.024sys and FBs→D s ð1Þ ¼ 0.883 0.012stat 0.028sys. We discuss the consequences for jVcbj in light of recent investigations into the extrapolation of experimental data to zero recoil.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Davies, Professor Christine |
| Authors: | Harrison, J., Davies, C. T.H., and Wingate, M. |
| 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 |
| Published Online: | 09 March 2018 |
| Copyright Holders: | Copyright © 2018 The Authors |
| First Published: | First published in Physical Review D 97(5):054502 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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