Light Quark Masses with an O(a)-Improved Action

Abstract

We present the recent Fermilab calculations of the masses of the light quarks, using tadpole-improved Sheikholeslami-Wohlert (SW) quarks. Various sources of systematic errors are studied. Our final result for the average light quark mass in the quenched approximation evaluated in the $\overline{MS}$ scheme is ${\bar{m}}_q(\mu =2GeV;n_f=0)=(m_u+m_d)/2=3.6\pm 0.6MeV$.

Comments: 3 pgs. 3 figures. espcrc2.sty included. Talk presented at LATTICE96(phenomenology)