ar X iv : h ep - l at / 9 90 91 28 v 1 1 6 Se p 19 99 1 Chiral Effects of Quenched η ′ Loops ∗
نویسنده
چکیده
Preliminary results of a study of quenched chiral logarithms at β = 5.7 are presented. Four independent determinations of the quenched chiral log parameter δ are obtained. Two of these are from estimates of the η′ mass, one from the residue of the hairpin diagram and the other from the topological susceptibility combined with the Witten-Veneziano formula. The other two determinations of δ are from measurement of virtual η′ loop effects in m π vs. quark mass and in the chiral behavior of the pseudoscalar decay constant. All of our results are consistent with δ = .080(15). The expected absence of quenched chiral logs in the axial-vector decay constant is also observed.
منابع مشابه
ar X iv : h ep - l at / 9 90 90 26 v 2 2 4 Se p 19 99 1 Chiral symmetry breaking from Ginsparg - Wilson fermions ∗
We calculate the large-volume and small-mass dependences of the quark condensate in quenched QCD using Neuberger's operator. We find good agreement with the predictions of quenched chiral perturbation theory, enabling a determination of the chiral lagrangian parameter Σ, up to a multiplicative renormalization.
متن کاملar X iv : h ep - l at / 9 60 90 07 v 1 3 1 A ug 1 99 6 1 The Staggered η ′ with Smeared Operators
We present a refined calculation of the η ′ mass using staggered fermions and Wuppertal smeared operators to suppress excited state contributions. We use quenched and dynamical configurations of size 16 3 × 32, with N f = 0, N f = 2 and N f = 4, and compare our results with the expected theoretical forms from quenched, partially quenched, and unquenched chiral perturbation theory.
متن کاملar X iv : h ep - l at / 9 70 90 90 v 1 2 3 Se p 19 97 1 Quenched Chiral Perturbation Theory to one loop ∗
The divergences of the generating functional of quenched Chiral Perturbation theory (qCHPT) to one loop are computed in closed form. We show how the quenched chiral logarithms can be reabsorbed in the renormalization of the B0 parameter of the leading order Lagrangian. Finally, we do the chiral power counting for the quenched case and show that also finite loop corrections may diverge in the ch...
متن کاملar X iv : h ep - l at / 9 90 91 54 v 1 2 4 Se p 19 99 1 September 1999 Lattice QCD with Domain - Wall Fermions ∗
We study the quenched lattice QCD using domain-wall fermions at β = 6.0. Behaviors of both pion mass and the explicit breaking term in the axial Ward-Takahashi identity support the existence of the chiral zero modes. We observe a good agreement between the pion decay constants fπ from both the conserved axial current and the local current perturbatively renormalized at 1-loop. Finally the possi...
متن کاملar X iv : h ep - l at / 9 80 90 93 v 1 1 4 Se p 19 98
The static potential in the 3d SU(2) Higgs model is computed by a variational calculation employing Wilson loops and two-meson operators. String breaking is demonstrated numerically, the breaking scale is determined and the results are compared with a quenched calculation.
متن کامل