Hughes, C., Davies, C.T.H. and Monahan, C.J. (2018) New methods for B meson decay constants and form factors from lattice NRQCD. Physical Review D, 97(5), 054509. (doi: 10.1103/PhysRevD.97.054509)
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Abstract
We determine the normalization of scalar and pseudoscalar current operators made from nonrelativistic b quarks and highly improved staggered light quarks in lattice quantum chromodynamics (QCD) through OðαsÞ and ΛQCD=mb. We use matrix elements of these operators to extract B meson decay constants and form factors, and then compare to those obtained using the standard vector and axial-vector operators. This provides a test of systematic errors in the lattice QCD determination of the B meson decay constants and form factors. We provide a new value for the B and Bs meson decay constants from lattice QCD calculations on ensembles that include u, d, s, and c quarks in the sea and those that have the u=d quark mass going down to its physical value. Our results are fB ¼ 0.196ð6Þ GeV, fBs ¼ 0.236ð7Þ GeV, and fBs =fB ¼ 1.207ð7Þ, agreeing well with earlier results using the temporal axial current. By combining with these previous results, we provide updated values of fB ¼ 0.190ð4Þ GeV, fBs ¼ 0.229ð5Þ GeV, and fBs =fB ¼ 1.206ð5Þ.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Davies, Professor Christine |
| Authors: | Hughes, C., Davies, C.T.H., and Monahan, C.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 |
| Published Online: | 20 March 2018 |
| Copyright Holders: | Copyright © 2018 The Authors |
| First Published: | First published in Physical Review D 97(5):054509 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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