skip to main content

DOE PAGESDOE PAGES

Title: New methods for B meson decay constants and form factors from lattice NRQCD

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 O(α s) and Λ QCD/m b. 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 B s 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 f B=0.196(6) GeV, f Bs=0.236(7) GeV, and f Bs/f B=1.207(7), agreeing well with earlier results using the temporal axial current. By combining with these previous results, we provide updated values of f B=0.190(4) GeV, f Bs=0.229(5) GeV, and f Bs/f B=1.206(5).
Authors:
 [1] ; ORCiD logo [2] ;  [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Cambridge (United Kingdom)
  2. University of Glasgow (United Kingdom). SUPA, School of Physics and Astronomy
  3. Univ. of Washington, Seattle, WA (United States). Institute for Nuclear Theory; The State University of New Jersey, Piscataway, NJ (United States)
Publication Date:
Report Number(s):
FERMILAB-PUB-17-547-T; arXiv:1711.09981
Journal ID: ISSN 2470-0010; PRVDAQ; 1639266; TRN: US1801723
Grant/Contract Number:
AC02-07CH11359; FG02-00ER41132
Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
HPQCD Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1427314
Alternate Identifier(s):
OSTI ID: 1423230