Topological Charge Screening and the `Proton Spin' Beyond the Chiral Limit

Details Topological Charge Screening and the `Proton Spin' Beyond the Chiral Limit Topological Charge Screening and the `Proton Spin' Beyond the Chiral Limit

1998-12-11

arxiv.org/abs/hep-ph/9812333v1

Nucl.Phys. B546 (1999) 235-278

Physics

High Energy Physics

High Energy Physics - Phenomenology

44 pages, plain TeX, 2 ps figures

Scientific paper

10.1016/S0550-3213(99)00061-9

The theory of the `proton spin' effect proposed in our earlier papers is extended to include the chiral SU(3) symmetry breaking and flavour mixing induced by non-vanishing quark masses in QCD. The theoretical basis is the derivation of exact, unified Goldberger-Treiman (GT) relations valid beyond the chiral limit. The observed suppression in the flavour singlet axial charge $a^0(Q^2)$ is explained by an anomalously small value for the slope of the singlet current correlation function $<0|T~\pl^\m J_{\m 5}^0 ~ \pl^\n J_{\n 5}^0 |0>$, a consequence of the screening of topological charge in the QCD vacuum. Numerical predictions are obtained by evaluating the current correlation functions using QCD spectral sum rules. The results, $a^0(Q^2) = 0.31 \pm 0.02$ and $\int dx ~g_1^p(x,Q^2) = 0.141 \pm 0.005$ (at $Q^2=10 \~\GV^2$), are in good agreement with current experimental data on the polarised proton structure function $g_1^p$.

Affiliated with

Also associated with

No associations

Rating

Topological Charge Screening and the `Proton Spin' Beyond the Chiral Limit does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Topological Charge Screening and the `Proton Spin' Beyond the Chiral Limit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Topological Charge Screening and the `Proton Spin' Beyond the Chiral Limit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-38565