Updating spin-dependent Regge intercepts
High Energy Physics - Phenomenology
2018-09-12 v1 Nuclear Experiment
Nuclear Theory
Abstract
We use new high statistics data from CLAS and COMPASS on the nucleon's spin structure function at low Bjorken x and low virtuality, Q^2 < 0.5 GeV^2, together with earlier measurements from the SLAC E-143, HERMES and GDH experiments to estimate the effective intercept(s) for spin dependent Regge theory. We find alpha_{a_1} = 0.31 \pm 0.04 for the intercept describing the high-energy behaviour of spin dependent photoabsorption together with a new estimate for the high-energy part of the Gerasimov-Drell-Hearn sum-rule, -15 \pm 2 mu b from photon-proton centre-of-mass energy greater than 2.5 GeV. Our value of alpha_[a_1} suggests QCD physics beyond a simple straight-line a_1 trajectory.
Cite
@article{arxiv.1808.03202,
title = {Updating spin-dependent Regge intercepts},
author = {Steven D. Bass and Magdalena Skurzok and Pawel Moskal},
journal= {arXiv preprint arXiv:1808.03202},
year = {2018}
}
Comments
4 pages, 1 figure, to appear in Physical Review C