Results for the Etaprime Mass from Two-Flavor Lattice QCD

TL;DR

This study computes the eta-prime meson mass using two-flavor lattice QCD with improved actions, providing a continuum limit estimate and analyzing systematic uncertainties.

Contribution

First lattice QCD calculation of eta-prime mass with two flavors using RG-improved gauge and clover fermion actions in the continuum limit.

Findings

Eta-prime mass estimated at 0.960 GeV with uncertainties.

Systematic errors from chiral and continuum extrapolations quantified.

Method successfully applies quark smearing to improve ground state signals.

Abstract

We present results for the mass of the etaprime meson for two-flavor lattice QCD in the continuum limit, calculated on the CP-PACS computer, using an RG-improved gauge action and clover fermion action with tadpole-improved csw. Measurements are made at three couplings corresponding to a approx. 0.22, 0.16, 0.11 fm for four quark masses corresponding to mpi over mrho approx. 0.8, 0.75, 0.7, 0.6. Thw two-loop diagrams are evaluated using a noisy source method. Quark smearing for both one- and two- loop diagrams is successfully applied to obtain ground state signals in the etaprime channel. We obtain metaprime=0.960(87)+0.036-0.286GeV in the continuum limit, where the second error represents the systematic uncertainty coming from varying the functional form for chiral and continuum extrapolations.