B semileptonic decays with 2+1 dynamical quark flavors
  We study semileptonic B decays, using MILC dynamical configurations with $N_f=2+1$. NRQCD heavy and AsqTad light quark actions are used. We obtain the semileptonic form factors $f_+(q^2)$ and $f_0(q^2)$ in the chiral limit. 
Emel Gulez, Christine Davies, Alan Gray, Peter Lepage, Junko   Shigemitsu, Matthew Wingate