Spin dependent structure function g1. Recent experimental results

✍ Scribed by Gonzalo Gracia Abril

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 518 KB
• Volume: 71
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(98)00329-6

✦ Synopsis

In the last two years new measurements of the structure functions gP, g~, gd have been performed by experiments at CERN, SLAC and DESY. A complete review of these experimental results is presented. Perturbative QCD evolution in next-to-leading order is used to evolve gl to a common Q2 at which the first moment of the structure function is evaluated. Results from different experiments show consistently a violation of the Ellis-Jaffe sum rule. A preliminary combined analysis of all the available data gives at 5 GeV2: F p -F~ --f: gP(x) -f: g~(x) = 0.189 4-0.018, in agreement with the theoretical prediction given by the Bjorken sum rule 0.181 4-0.03.