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B→ π l ν decay in unquenched QCD

Presenter: Paul Mackenzie — Fermilab

Paul Mackenzie and Ruth Van de Water for the Fermilab and MILC lattice collaborations

We report on our calculation of the B->pi l nu semileptonic form factors using 2+1 dynamical flavors of improved staggered light quarks, and clover heavy quarks with the Fermilab interpretation. We discuss improvements in the calculational methods, including use of an improved meson smearing in the time direction to reduce excited state effects, and improved treatment of the q2 shape using the analyticity and unitarity-based z-expansion.