We present an update of our calculation of the form factor for B -> D* l nu at zero recoil, with higher statistics and finer lattices. As before, we use the Fermilab action for b and c quarks, the asqtad staggered action for light valence quarks, and the MILC ensembles for gluons and light quarks (L\"uscher-Weisz married to 2+1 rooted staggered sea quarks). In this update, we have reduced the total uncertainty on F(1) from 2.6% to 1.7%. At Lattice2010 we presented a still-blinded result, but this writeup includes the unblinded result from the September 2010 CKM workshop.
Cite
@article{arxiv.1011.2166,
title = {B -> D* l nu at zero recoil: an update},
author = {Jon A. Bailey and A. Bazavov and C. Bernard and C. M. Bouchard and C. DeTar and A. X. El-Khadra and E. D. Freeland and E. Gámiz and Steven Gottlieb and U. M. Heller and J. E. Hetrick and A. S. Kronfeld and J. Laiho and L. Levkova and P. B. Mackenzie and M. B. Oktay and J. N. Simone and R. Sugar and D. Toussaint and R. S. Van de Water},
journal= {arXiv preprint arXiv:1011.2166},
year = {2011}
}
Comments
7 pp., 2 figs, presented at Lattice 2010, June 14-19, 2010, Villasimius, Italy