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We evaluate the $Lambda_cSigma_cpi$ coupling constant ($G_{Lambda_c Sigma_c pi}$) and the width of the strong decay $Sigma_c rightarrowLambda_c pi$ in 2+1 flavor lattice QCD on four different ensembles with pion masses ranging from 700 MeV to 300 MeV. We find $G_{Lambda_c Sigma_c pi}=18.332(1.476)_{rm{stat.}}(2.171)_{rm{syst.}}$ and the decay width $Gamma(Sigma_c rightarrowLambda_c pi)=1.65(28)_{rm{stat.}}(30)_{rm{syst.}}$~MeV on the physical quark-mass point, which is in agreement with the recent experimental determination.
We determine $D$ and $D_s$ decay constants from lattice QCD with 2% errors, 4 times better than experiment and previous theory: $f_{D_s}$ = 241(3) MeV, $f_D$ = 207(4) MeV and $f_{D_s}/f_D$ = 1.164(11). We also obtain $f_K/f_{pi}$ = 1.189(7) and $(f
We determine the decay constants of the pi and K mesons on gluon field configurations from the MILC collaboration including u, d, s and c quarks. We use three values of the lattice spacing and u/d quark masses going down to the physical value. We use
We use lattice QCD to calculate the form factors $f_+(q^2)$ and $f_0(q^2)$ for the semileptonic decay $B_sto Kell u$. Our calculation uses six MILC asqtad 2+1 flavor gauge-field ensembles with three lattice spacings. At the smallest and largest latti
We present a model-independent calculation of hadron matrix elements for all dimension-six operators associated with baryon number violating processes using lattice QCD. The calculation is performed with the Wilson quark action in the quenched approx
We calculate the form factors of the $K to pi l u$ semileptonic decays in three-flavor lattice QCD, and study their chiral behavior as a function of the momentum transfer and the Nambu-Goldstone boson masses. Chiral symmetry is exactly preserved by