B meson semileptonic form factors from unquenched lattice QCD

Emel Gulez, Alan Gray, Matthew Wingate, Christine T. H. Davies, G. Peter Lepage, and Junko Shigemitsu (HPQCD Collaboration)
Phys. Rev. D 73, 074502 – Published 6 April 2006; Erratum Phys. Rev. D 75, 119906 (2007)

Abstract

The semileptonic process, Bπlν, is studied via full QCD lattice simulations. We use unquenched gauge configurations generated by the MILC Collaboration. These include the effect of vacuum polarization from three quark flavors: the s quark and two very light flavors (u/d) of variable mass allowing extrapolations to the physical chiral limit. We employ nonrelativistic QCD to simulate the b quark and a highly improved staggered quark action for the light sea and valence quarks. We calculate the form factors f+(q2) and f0(q2) in the chiral limit for the range 16GeV2q2<qmax2 and obtain 16GeV2qmax2[dΓ/dq2]dq2/|Vub|2=1.46(35)ps1. Combining this with a preliminary average by the Heavy Flavor Averaging Group (HFAG’05) of recent branching fraction data for exclusive B semileptonic decays from the BABAR, Belle and CLEO Collaborations leads to |Vub|=4.22(30)(51)×103.

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  • Received 19 January 2006

DOI:https://doi.org/10.1103/PhysRevD.73.074502

©2006 American Physical Society

Erratum

Erratum: B meson semileptonic form factors from unquenched lattice QCD [Phys. Rev. D 73, 074502 (2006)]

Emel Gulez, Alan Gray, Matthew Wingate, Christine T. H. Davies, G. Peter Lepage, and Junko Shigemitsu
Phys. Rev. D 75, 119906 (2007)

Authors & Affiliations

Emel Gulez1, Alan Gray1, Matthew Wingate2, Christine T. H. Davies3, G. Peter Lepage4, and Junko Shigemitsu1 (HPQCD Collaboration)

  • 1Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
  • 2Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550, USA
  • 3Department of Physics & Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
  • 4Laboratory of Elementary Particle Physics, Cornell University, Ithaca, New York 14853, USA

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Issue

Vol. 73, Iss. 7 — 1 April 2006

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