Flavor Singlet Axial Coupling of the Proton - An Updated Analysis

Abstract

We present a combined analysis of SESAM and TxL data for the flavor singlet axial coupling G_A^1 of the proton, which is very helpful to stabilize the disconnected signals at small quark masses. From connected and disconnected contributions we use the tadpole improved renormalization constant Z_A and obtain G_A^1=0.21(12).

Comments: 3 pages, contribution to LATTICE99 (matrix elements)