Improved QCD sum rule estimates of the higher twist contributions to polarised and unpolarised nucleon structure functions

Details Improved QCD sum rule estimates of the higher twist contributions to polarised and unpolarised nucleon structure functions Improved QCD sum rule estimates of the higher twist contributions to polarised and unpolarised nucleon structure functions

1993-12-07

arxiv.org/abs/hep-ph/9312237v1

Phys.Lett. B322 (1994) 425-430

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages and 3 figures which are included as postscript files at the end and should be stripped off to latex the paper

Scientific paper

10.1016/0370-2693(94)91175-4

We re-examine the estimates of the higher twist contributions to the integral of $g_1$, the polarised structure function of the nucleon, based on QCD sum rules. By including corrections both to the perturbative contribution and to the low energy contribution we find that the matrix elements of the relevant operators are more stable to variations of the Borel parameter $M^2$, allowing for a meaningful estimate of the matrix elements. We find that these matrix elements are typically twice as large as previous estimates. However, inserting these new estimates into the recently corrected expressions for the first moments of $g_1$ leads to corrections too small to affect the phenomenological analysis. For the unpolarised case the higher twist corrections to the GLS and Bjorken sum rules are substantial and bring the estimate of $\Lambda_{QCD}$ from the former into good agreement with that obtained from the $Q^2$ dependence of deep inelastic data.

Affiliated with

Also associated with

No associations

Rating

Improved QCD sum rule estimates of the higher twist contributions to polarised and unpolarised nucleon structure functions 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 Improved QCD sum rule estimates of the higher twist contributions to polarised and unpolarised nucleon structure functions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved QCD sum rule estimates of the higher twist contributions to polarised and unpolarised nucleon structure functions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-311981