Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-10-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited talk at the Conference Baryon 98, Bonn, Sept. 22-26, 1998, to be published in Proceedings, 5 pages, LaTeX 2e, b98proc.
Scientific paper
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, $\Sigma = 0.33\pm 0.20$, $\chi^{\prime}(0) = (2.4\pm 0.5)\cdot 10^{-3} GeV.$ The values of $g_A = 1.37 \pm 0.10$ and $g^8_A = 0.65 \pm 0.15$ are also determined.
Ioffe Lev B.
Oganesian Armen
No associations
LandOfFree
Proton spin content, axial coupling constant 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, axial coupling constant 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, axial coupling constant and QCD topological susceptibility will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-356229