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Flavor Singlet Axial Coupling of the Proton An Updated Analysis
1
Flavor Singlet Axial Coupling of the Proton – An Updated Analysis ∗
J. Viehoffa for the SESAMa,b Collaboration
aNIC c/o Forschungszentrum J¨ulich, D-52425 J¨ulich, and DESY, D-22603 Hamburg, Germany.
bPhysics Department, University of Wuppertal, D-42097 Wuppertal, Germany.
9 We present a combined analysis of SESAM and T χL data for the flavor singlet axial coupling G1 of the proton,
A
9 which is very helpful to stabilize the disconnected signals at small quark masses. From connected and disconnected
9 contributions we use the tadpole improved renormalization constant ZA and obtain G1 = 0.21(12).
1 A
t
c
O 1. Introduction 2. Lattice techniques
1 The flavor singlet axial coupling of the proton On the lattice both connected and disconnected
1
is defined as diagrams for GA (see figure 1) can be calculated
1 from ratios of correlation functions [4].
v s G1 ¯
= P |uγ¯ γ u + dγ γ d + sγ¯ γ s|P , (1)
1 A 5 5 5
0 where s denotes the components of the proton qq
0
0 polarization vector. In the naive parton model jµ jµ
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