https://doi.org/10.1051/epjconf/201817514021
New methods for B decay constants and form factors from Lattice NRQCD
1
SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
2
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
3
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, CB3 0WA, UK
4
Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195, USA
5
New High Energy Theory Center and Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA
* Speaker, e-mail: christine.davies@glasgow.ac.uk
Published online: 26 March 2018
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(αs∧QCD/mb). 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.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
