Abstract
The semileptonic process, , 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 quark and two very light flavors () of variable mass allowing extrapolations to the physical chiral limit. We employ nonrelativistic QCD to simulate the quark and a highly improved staggered quark action for the light sea and valence quarks. We calculate the form factors and in the chiral limit for the range and obtain . Combining this with a preliminary average by the Heavy Flavor Averaging Group (HFAG’05) of recent branching fraction data for exclusive semileptonic decays from the BABAR, Belle and CLEO Collaborations leads to .
7 More- Received 19 January 2006
DOI:https://doi.org/10.1103/PhysRevD.73.074502
©2006 American Physical Society