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Peter Lepage, Heechang Na, Jonna Koponen, Junko Shigemitsu","submitted_at":"2011-09-07T15:58:51Z","abstract_excerpt":"We present a new calculation of the $D \\rightarrow \\pi, l \\nu$ semileptonic form factor $f^{D \\rightarrow \\pi}_+(q^2)$ at $q^2 = 0$ based on HISQ charm and light valence quarks on MILC $N_f = 2 +1$ lattices. Using methods developed recently for HPQCD's study of $D \\rightarrow K, l \\nu$ decays, we find $f^{D \\rightarrow \\pi}_+(0) = 0.666(29)$. This signifies a better than factor of two improvement in errors for this quantity compared to previous calculations. 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