Updating spin-dependent Regge intercepts

作者：Bass Steven D^*; Skurzok Magdalena; Moskal Pawel

来源：PHYSICAL REVIEW C, 2018, 98(2): 025209.

DOI：10.1103/PhysRevC.98.025209

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 GeV2, 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(a1) = 0.31 +/- 0.04 for the intercept describing the high-energy behavior of spin dependent photoabsorption together with a new estimate for the high-energy part of the Gerasimov-Drell-Hearn sum rule: - 15 +/- 2 mu b from photon-proton center-of-mass energy greater than 2.5 GeV. Our value of alpha(a1) suggests QCD physics beyond a simple straight-line a(1) trajectory.

• 出版日期2018-8-29