Determination of the effective strong coupling constant $$\alpha_{s,g_1}(Q^2)$$ from CLAS spin structure function data

Journal Article · Tue Jul 01 00:00:00 EDT 2008 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2008.06.049· OSTI ID:955843

Deur, Alexandre; Burkert, Volker; Chen, Jian-Ping; Korsch, Wolfgang

We present a new extraction of the effective strong coupling constant $$\alpha_{s,g_1}(Q^2)$$. The result agrees with a previous determination and extends the measurement of the low and high $Q^2$ behavior of $$\alpha_{s,g_1}(Q^2)$$ that was previously deduced from sum rules. In particular, it experimentally verifies the lack of $Q^2$-dependence of $$\alpha_{s,g_1}(Q^2)$$ in the low $Q^2$ limit. This fact is necessary for application of the AdS/CFT correspondence to QCD calculations. We provide a physics motivated parameterization of $$\alpha_{s,g_1}(Q^2)$$ that can equivalently be used to parameterize the $Q^2$-dependence of the generalized Gerasimov-Drell-Hearn and Bjorken sums.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-060R23177
• OSTI ID: 955843
• Report Number(s): JLAB-PHY-08-808; arXiv:0803.4119; DOE/OR/23177-3726; PYLBAJ; TRN: US201014%%1403
• Journal Information: Physics Letters B, Vol. 665; ISSN 0370-2693
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING CONSTANTS
PHYSICS
QUANTUM CHROMODYNAMICS
SPIN
STRUCTURE FUNCTIONS
SUM RULES