Study of stochastic estimates of quark loops with unbiased subtraction
暂无分享,去创建一个
Stochastic noise estimator method is a powerful tool to calculate the disconnected insertion involving quark loops. We study the variance reduction technique with unbiased subtraction. We use the complex Z2 noise to calculate the quark loops on a 16 3 × 24 lattice with � = 6.0 and � = 0.154. Unbiased subtraction method is performed by using hoping parameter expansion. We report on the variance reduction for the point-split vector current as a function of the number of subtraction terms and the number of noise used.
[1] Liu,et al. pi NN and pseudoscalar form factors from lattice QCD. , 1994, Physical review letters.
[2] K. Liu,et al. Stochastic estimation with Z2 noise , 1993, hep-lat/9308015.
[3] Disconnected electromagnetic form factors , 2000, hep-lat/0010060.
[4] C. Thron,et al. Monte Carlo methods for estimating linear combinations of inverse matrix entries in lattice QCD , 1994 .
[5] Liu,et al. Flavor-singlet gA from lattice QCD. , 1995, Physical review letters.