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Constraints on Disconnected Contributions in Scattering
N. Ripunjay Acharya, Feng-Kun Guo, Ulf-G. Meißner +1
The accuracy of the lattice QCD computation of hadron-hadron scattering at low isospin depends critically on the ability to compute correlation functions with fermionic disconnecte…
Connected and Disconnected Contractions in Pion-Pion Scattering
Neramballi Ripunjay Acharya, Feng-Kun Guo, Ulf-G. Meißner +1
We show that the interplay of chiral effective field theory and lattice QCD can be used in the evaluation of so-called disconnected diagrams, which appear in the study of the isosc…
The electric dipole moment of the neutron from 2+1 flavor lattice QCD
F. -K. Guo, R. Horsley, U. -G. Meissner +6
We compute the electric dipole moment d_n of the neutron from a fully dynamical simulation of lattice QCD with 2+1 flavors of clover fermions and nonvanishing theta term. The latte…
Tetraquarks, hadronic molecules, meson-meson scattering and disconnected contributions in lattice QCD
Feng-Kun Guo, Liuming Liu, Ulf-G. Meißner +1
There are generally two types of Wick contractions in lattice QCD calculations of a correlation function --- connected and disconnected ones. The disconnected contribution is diffi…
Interactions of Charmed Mesons with Light Pseudoscalar Mesons from Lattice QCD and Implications on the Nature of the D_{s0}^*(2317)
Liuming Liu, Kostas Orginos, Feng-Kun Guo +2
We study the scattering of light pseudoscalar mesons (, ) off charmed mesons (, ) in full lattice QCD. The S-wave scattering lengths are calculated using Lüscher's fi…