Global Analysis of Data on the Proton Structure Function g{sub 1} and Extraction of its Moments
Inspired by recent measurements with the CLAS detector at Jefferson Lab, we perform a self-consistent analysis of world data on the proton structure function g{sub 1} in the range 0.17 < Q{sup 2} < 30 (GeV/c){sup 2}. We compute low-order moments g{sub 1} and study their evolution from small to large values of Q{sup 2}. The analysis takes includes the latest data on the unpolarized inclusive cross sections, the recent results for the ratio R = {sigma}{sub L}/{sigma}{sub T}, and a new model for the transverse asymmetry A{sub 2} in the resonance region. The contributions of both leading and higher twists are extracted, taking into account effects from radiative corrections beyond the next-to-leading order by means of soft-gluon resummation techniques. The contribution of higher twists to the g{sub 1} moments is found to be significantly larger than in the case of the unpolarized structure function F{sub 2}.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 835639
- Report Number(s):
- JLAB-PHY-05-9; DOE/ER/40150-3038; TRN: US0500142
- Journal Information:
- Phys.Rev.D, Vol. 71, Issue 5; Other Information: No journal information given for this preprint; PBD: 1 Jan 2005
- Country of Publication:
- United States
- Language:
- English
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