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Phys. Rev. D 78, 032001 (2008) [7 pages]

Experimental study of isovector spin sum rules

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A. Deur1, P. Bosted1, V. Burkert1, D. Crabb2, V. Dharmawardane3,*, G. E. Dodge3, T. A. Forest4, K. A. Griffioen5, S. E. Kuhn3, R. Minehart2, and Y. Prok.2,†
1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
2University of Virginia, Charlottesville, Virginia 22904, USA
3Old Dominion University, Norfolk, Virginia 23529, USA
4Idaho State University, Pocatello, Idaho, 83209, USA
5College of William and Mary, Williamsburg, Virginia 23187, USA

Received 21 February 2008; published 6 August 2008

We present the Bjorken integral extracted from Jefferson Lab experiment EG1b for 0.05<Q2<2.92  GeV2. The integral is fit to extract the twist-4 element f2p-n which appears to be relatively large and negative. Systematic studies of this higher twist analysis establish its legitimacy at Q2 around 1  GeV2. We also performed an isospin decomposition of the generalized forward spin polarizability γ0. Although its isovector part provides a reliable test of the calculation techniques of chiral perturbation theory, our data disagree with the calculations.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.78.032001
DOI:
10.1103/PhysRevD.78.032001
PACS:
13.60.Hb, 11.55.Hx, 12.38.Qk, 25.30.Rw

*Present address: New Mexico State University, Las Cruces, NM 88003, USA.

†Present address: Christopher Newport University, Newport News, VA 23606, USA.

 
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