Potentials between pairs of static-light mesons

Details Potentials between pairs of static-light mesons Potentials between pairs of static-light mesons

2011-11-09

arxiv.org/abs/1111.2222v1

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 3 figures. Talk presented at the XXIX International Symposium on Lattice Field Theory, Lattice2011, Squaw Valley, Lak

Scientific paper

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.

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