出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on progress in measuring disconnected correlators associated with pseudoscalar avorsinglet
mesons. This will eventually allow us to compute the masses of the eta and eta' mesons.
Flavor-singlet physics also presents an interesting test of the staggered fermion formulation, as
disconnected correlators are sensitive to whether the same action governs both sea quarks and
valence quarks. It can also help test the validity of the .fourth-root trick. used in unquenched
lattice calculations where the number of avors Nf < 4.
