High-Precision Determination of the $π$ , $K$ , $D$ , and $D_{s}$ Decay Constants from Lattice QCD

Top Cited Papers

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_{π} = 1.189 (7)

and

(f_{D_{s}} / f_{D}) / (f_{K} / f_{π}) = 0.979 (11)

. Combining with experiment gives

V_{us} = 0.2262 (14)

and

V_{cs} / V_{cd}

of 4.43(41). We use a highly improved quark discretization on MILC gluon fields that include realistic sea quarks, fixing the

u / d

s

, and

c

masses from the

π

K

, and

η_{c}

meson masses. This allows a stringent test against experiment for

D

and

D_{s}

masses for the first time (to within 7 MeV).

This publication has 22 references indexed in Scilit:

High-Precision Determination of theπ,K,D, andDsDecay Constants from Lattice QCD