%0 Generic %1 Liu2017Variance %A Liu, Keh-Fei %A Liang, Jian %A Yang, Yi-Bo %D 2017 %K rho, signal %T Variance Reduction and Cluster Decomposition %U http://arxiv.org/abs/1705.06358 %X It is a common problem in lattice QCD calculation of the mass of the hadron with an annihilation channel that the signal falls off in time while the noise remains constant. In addition, the disconnected insertion calculation of the three-point function and the calculation of the neutron electric dipole moment with the \$þeta\$ term suffer from a noise problem due to the \$V\$ fluctuation. We identify these problems to have the same origin and the \$V\$ problem can be overcome by utilizing the cluster decomposition principle. We demonstrate this by considering the calculations of the glueball mass, the strangeness content in the nucleon, and the CP violation angle in the nucleon due to the \$þeta\$ term. It is found that for lattices with physical sizes of 4.5 - 5.5 fm, the errors of these quantities can be reduced by a factor of 3 to 4.

@misc{Liu2017Variance, abstract = {It is a common problem in lattice QCD calculation of the mass of the hadron with an annihilation channel that the signal falls off in time while the noise remains constant. In addition, the disconnected insertion calculation of the three-point function and the calculation of the neutron electric dipole moment with the \$\theta\$ term suffer from a noise problem due to the \$\sqrt{V}\$ fluctuation. We identify these problems to have the same origin and the \$\sqrt{V}\$ problem can be overcome by utilizing the cluster decomposition principle. We demonstrate this by considering the calculations of the glueball mass, the strangeness content in the nucleon, and the CP violation angle in the nucleon due to the \$\theta\$ term. It is found that for lattices with physical sizes of 4.5 - 5.5 fm, the errors of these quantities can be reduced by a factor of 3 to 4.}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Liu, Keh-Fei and Liang, Jian and Yang, Yi-Bo}, biburl = {https://www.bibsonomy.org/bibtex/23a3c40fe9196b82b1464ba0849a14079/cmcneile}, citeulike-article-id = {14359810}, citeulike-linkout-0 = {http://arxiv.org/abs/1705.06358}, citeulike-linkout-1 = {http://arxiv.org/pdf/1705.06358}, day = 5, eprint = {1705.06358}, interhash = {710cd90ed598da5e59c274790594541d}, intrahash = {3a3c40fe9196b82b1464ba0849a14079}, keywords = {rho, signal}, month = jun, posted-at = {2017-08-01 10:07:32}, priority = {2}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{Variance Reduction and Cluster Decomposition}}, url = {http://arxiv.org/abs/1705.06358}, year = 2017 }