Topological susceptibility in two flavors lattice QCD with the optimal domainwall fermion
Abstract
We determine the topological susceptibility of the gauge configurations generated by lattice simulations using two flavors of optimal domainwall fermion on the 16×32 lattice with length 16 in the fifth dimension, at the lattice spacing a≃0.1 fm. Using the adaptive thickrestart Lanczos algorithm, we project the lowlying eigenmodes of the overlap Dirac operator, and obtain the topological charge of each configuration, for eight ensembles with pion masses in the range 220550 MeV. From the topological charge, we compute the topological susceptibility and the second normalized cumulant. Our result of the topological susceptibility agrees with the seaquark mass dependence predicted by the chiral perturbation theory and provides a determination of the chiral condensate, Σ(2 GeV)=[259, and the pion decay constant Fπ=92(12)(2) MeV.
 Publication:

Physics Letters B
 Pub Date:
 August 2011
 DOI:
 10.1016/j.physletb.2011.06.070
 arXiv:
 arXiv:1105.4414
 Bibcode:
 2011PhLB..702..131C
 Keywords:

 High Energy Physics  Lattice;
 High Energy Physics  Phenomenology
 EPrint:
 10 pages, 3 EPS figures, v2: typos corrected, to appear in Phys. Lett. B