We present a high statistics calculation of f{hook}B in the static limit. The results have been obtained by numerical simulation of quenched QCD, at β = 6.0 on a 183 × 32 lattice. We compare f{hook}B calculated by using the Wilson and the Clover quark actions. The decay constant is obtained by studying heavy-light correlation functions of different smeared operators, on a sample of 210 gauge field configurations. We find that cubic smearings of size Ls ≤ 3 or Ls ≥ 9 are bad projectors on the lightest pseudoscalar state. Combining the information coming from smearing Ls = 5 and Ls = 7, we have obtained f{hook}B = 370±40 MeV in the clover case and f{hook}B = 350±40±30 MeV in the Wilson case. Our results support a large value of the pseudoscalar decay constant in the static approximation. © 1994.
Allton, C., Lubicz, V., Martinelli, G., Salina, G., Vladikas, A., Bartoloni, A., et al. (1994). A high statistics lattice calculation of ƒB in the static limit on APE. NUCLEAR PHYSICS. B, 413(1-2), 461-480 [10.1016/0550-3213(94)90628-9].
A high statistics lattice calculation of ƒB in the static limit on APE
RAPUANO, FEDERICO;
1994
Abstract
We present a high statistics calculation of f{hook}B in the static limit. The results have been obtained by numerical simulation of quenched QCD, at β = 6.0 on a 183 × 32 lattice. We compare f{hook}B calculated by using the Wilson and the Clover quark actions. The decay constant is obtained by studying heavy-light correlation functions of different smeared operators, on a sample of 210 gauge field configurations. We find that cubic smearings of size Ls ≤ 3 or Ls ≥ 9 are bad projectors on the lightest pseudoscalar state. Combining the information coming from smearing Ls = 5 and Ls = 7, we have obtained f{hook}B = 370±40 MeV in the clover case and f{hook}B = 350±40±30 MeV in the Wilson case. Our results support a large value of the pseudoscalar decay constant in the static approximation. © 1994.
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