B -> D* l nu at zero recoil: an update

Jon A. Bailey , A. Bazavov , C. Bernard , C.M. Bouchard , C. DeTar , A.X. El-Khadra , E.D. Freeland , E. G\'amiz

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Steven Gottlieb U.M. Heller J.E. Hetrick A.S. Kronfeld J. Laiho L. Levkova P.B. Mackenzie M.B. Oktay J.N. Simone R. Sugar D. Toussaint R.S. Van de Water

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classification ✦ hep-lat hep-ph

keywords quarksupdateactionlightrecoilresultstaggeredzero

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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.

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B -> D* l nu at zero recoil: an update

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