We give an update on our ongoing investigations of potentials between pairs of static-light mesons in Nf=2 Lattice QCD, in different spin and isospin channels. The question of attraction and repulsion is particularly interesting with respect to the X(3872) charmonium state and charged candidates such as the Z+(4430). We employ the nonperturbatively improved Sheikholeslami-Wohlert fermion and the Wilson gauge actions at two lattice spacings a approx. 0.084 fm and a approx. 0.077 fm with a pseudoscalar mass of mPS approx. 770 MeV and mPS approx. 400 MeV respectively. We use stochastic all-to-all propagator techniques, improved by a hopping parameter expansion. The analysis is based on the variational method, utilizing various source and sink interpolators.
@article{arxiv.1111.2222,
title = {Potentials between pairs of static-light mesons},
author = {Gunnar Bali and Martin Hetzenegger},
journal= {arXiv preprint arXiv:1111.2222},
year = {2011}
}
Comments
7 pages, 3 figures. Talk presented at the XXIX International Symposium on Lattice Field Theory, Lattice2011, Squaw Valley, Lake Tahoe, California, July 2011