With sufficiently light u and d quarks the isovector (a0) and isosinglet (f0) scalar meson propagators are dominated at large distances by two-meson states.In the staggered fermion formulation of lattice QCD,taste-symmetry breaking causes a proliferation of multihadron states that complicates the analysis of these channels.Of special interest is the bubble contribution,which makes a considerable contribution to these channels.Using numerical simulation we have measured the correlators for both a0 and f0 channels in the “Asqtad” improved staggered fermion formulation in a MILC fine (a = 0.09 fm) lattice ensemble.We analyze those correlators using rooted staggered chiral perturbation theory (rSxPT) and achieve chiral couplings that are well consistent with previous determinations.
参考文献
| [1] | Bazavov, A.;Toussaint, D.;Bernard, C.;Laiho, J.;Detar, C.;Levkova, L.;Oktay, M.B.;Gottlieb, S.;Heller, U.M.;Hetrick, J.E.;MacKenzie, P.B.;Sugar, R.;Van De Water, R.S. .Nonperturbative QCD simulations with 2+1 flavors of improved staggered quarks[J].Reviews of Modern Physics,2010(2):1349-1417. |
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