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Title: Decay Constants $$f_B$$ and $$f_{B_s}$$ from HISQ Simulations

We give a progress report on a project aimed at a high-precision calculation of the decay constants $$f_B$$ and $$f_{B_s}$$ from simulations with HISQ heavy and light valence and sea quarks. Calculations are carried out with several heavy valence-quark masses on ensembles with 2+1+1 flavors of HISQ sea quarks at five lattice spacings and several light sea-quark mass ratios $$m_{ud}/m_s$$, including approximately physical sea-quark masses. This range of parameters provides excellent control of the continuum limit and of heavy-quark discretization errors. We present a preliminary error budget with projected uncertainties of 2.2~MeV and 1.5~MeV for $$f_B$$ and $$f_{B_s}$$, respectively.
Authors:
;
Publication Date:
OSTI Identifier:
1250503
Report Number(s):
FERMILAB-CONF-15-482-CD-T; arXiv:1511.02294
1403561
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
MILC; Fermilab Lattice
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS