Experimental study of isovector spin sum rules
Journal Article
·
OSTI ID:922962
We present the Bjorken integral extracted from Jefferson Lab experiment EG1b for $0.05<2.92$ GeV$^2$. The integral is fit to extract the twist-4 element $$f_{2}^{p-n}$$ which is large and negative. Systematic studies of this higher twist analysis establish its legitimacy at $$Q^{2}$$ around 1 GeV$$^{2}$$. We also extracted the isovector part of the generalized forward spin polarizability $$\gamma_{0}$$. Although this quantity provides a robust test of Chiral Perturbation Theory, our data disagree with the calculations.
- 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:
- 922962
- Report Number(s):
- JLAB-PHY-08-775; DOE/OR/23177-0297; TRN: US0801830
- Country of Publication:
- United States
- Language:
- English
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