Ran Zhou, Steven Gottlieb, Jon A. Bailey, Daping Du, Aida X. El-Khadra, R. D. Jain, Andreas S. Kronfeld, Ruth S. Van de Water, Yuzhi Liu, Yannick Meurice, for the Fermilab Lattice, MILC Collaborations
We report on form factors for the B->K l^+ l^- semi-leptonic decay process. We use several lattice spacings from a=0.12 fm down to 0.06 fm and a variety of dynamical quark masses with 2+1 flavors of asqtad quarks provided by the MILC Collaboration. These ensembles allow good control of the chiral and continuum extrapolations. The b-quark is treated as a clover quark with the Fermilab interpretation. We update our results for f_\parallel and f_\perp, or, equivalently, f_+ and f_0. In addition, we present new results for the tensor form factor f_T. Model independent results are obtained based upon the z-expansion.
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http://arxiv.org/abs/1211.1390
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