New Methods for B Decay Constants and Form Factors from Lattice NRQCD

Conference · Mon Jan 01 00:00:00 EST 2018 · EPJ Web of Conferences

DOI:https://doi.org/10.1051/epjconf/201817514021· OSTI ID:1436709

Davies, Christine ^[1]; Hughes, Ciaran ^[2]; Monahan, Christopher ^[3]

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1. Glasgow U.
2. Cambridge U., DAMTP
3. Rutgers U., Piscataway

We determine the normalisation of scalar and pseudo scalar current operators made from NonRelativistic QCD (NRQCD) b quarks and Highly Improved Staggered (HISQ) light quarks through O(α_sΛ_QCD/m_b). We use matrix elements of these operators to extract B meson decay constants and form factors and compare to those obtained using the standard vector and axial vector operators. We work on MILC second-generation 2+1+1 gluon field configurations, including those with physical light quarks in the sea. This provides a test of systematic uncertainties in these calculations and we find agreement between the results to the 2% level of uncertainty previously quoted.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1436709
• Report Number(s): FERMILAB-CONF-17-662-T; 1665408
• Journal Information: EPJ Web of Conferences, Vol. 175; Conference: 35th International Symposium on Lattice Field Theory, Granada, Spain, 06/18-06/24/2017; ISSN 2100-014X
• Publisher: EDP Sciences
• Country of Publication: United States
• Language: English