Decay Constants $$f_B$$ and $$f_{B_s}$$ from HISQ Simulations
Conference
·
OSTI ID:1250503
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.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Contributing Organization:
- MILC; Fermilab Lattice
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1250503
- Report Number(s):
- FERMILAB-CONF-15-482-CD-T; arXiv:1511.02294; 1403561
- Country of Publication:
- United States
- Language:
- English
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