Proton spin content and QCD topological susceptibility

Details Proton spin content and QCD topological susceptibility Proton spin content and QCD topological susceptibility

1998-01-19

arxiv.org/abs/hep-ph/9801345v1

Phys.Rev.D57:6590-6593,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 2 figures (eps), RevTex

Scientific paper

10.1103/PhysRevD.57.6590

The part of the proton spin $\Sigma$ carried by $u, d, s$ quarks is calculated in the framework of the QCD sum rules in the external fields. The operators up to dimension 9 are accounted. An important contribution comes from the operator of dimension 3, which in the limit of massless $u, d, s$ quarks is equal to the derivative of QCD topological susceptibility $\chi^{\prime} (0)$. The comparison with the experimental data on $\Sigma$ gives $\chi^{\prime}(0)= (2.3 \pm 0.6) \times 10^{-3} ~ GeV^2$. The limits on $\Sigma$ and $\chi^{\prime}(0)$ are found from selfconsistency of the sum rule, $\Sigma \ga 0.05,~~ \chi^{\prime} (0) \ga 1.6 \times 10^{-3} ~ GeV^2$. The values of $g_A = 1.37 \pm 0.10$ and $g^8_A = 0.65 \pm 0.15$ are also determined.

Affiliated with

Also associated with

No associations

Rating

Proton spin content and QCD topological susceptibility 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 Proton spin content and QCD topological susceptibility, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Proton spin content and QCD topological susceptibility will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-551099