Spin Sum Rules and the Strong Coupling Constant at large distance.

Conference · Wed Jul 01 00:00:00 EDT 2009 · AIP Conf. Proc.

DOI:https://doi.org/10.1063/1.3203292· OSTI ID:979052

Deur, Alexandre

We present recent results on the Bjorken and the generalized forward spin polarizability sum rules from Jefferson Lab Hall A and CLAS experiments, focusing on the low $Q^2$ part of the measurements. We then discuss the comparison of these results with Chiral Perturbation theory calculations. In the second part of this paper, we show how the Bjorken sum rule with its connection to the Gerasimov-Drell-Hearn sum, allows us to conveniently define an effective coupling for the strong force at all distances.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 979052
• Report Number(s): JLAB-PHY-09-987; DOE/OR/23177-0711; TRN: US201010%%367
• Journal Information: AIP Conf. Proc., Vol. 1155; Conference: Spin Structure at Long Distance Workshop, March 12-13, 2009, Newport News, VA
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING CONSTANTS
FOCUSING
PERTURBATION THEORY
POLARIZABILITY
SPIN
SUM RULES