Phys. Rev. Lett. 93, 212001 (2004) [4 pages]Experimental Determination of the Evolution of the Bjorken Integral at Low Q2 |
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A. Deur1, P. Bosted1,2, V. Burkert1, G. Cates3, J.-P. Chen1, Seonho Choi4, D. Crabb3, C. W. de Jager1, R. De Vita5, G. E. Dodge6, R. Fatemi3, T. A. Forest7, F. Garibaldi8, R. Gilman1,9, E. W. Hughes10, X. Jiang9, W. Korsch11, S. E. Kuhn6, W. Melnitchouk1, Z.-E. Meziani4, R. Minehart3, A. V. Skabelin12, K. Slifer3,4, M. Taiuti5, and J. Yun6
1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
2University of Massachusetts, Amherst, Massachusetts 01002, USA
3University of Virginia, Charlottesville, Virginia 22904, USA
4Temple University, Philadelphia, Pennsylvania 19122, USA
5INFN, Sezione di Genova, 16146 Genova, Italy
6Old Dominion University, Norfolk, Virginia 23529, USA
7Louisiana Tech University, Ruston, Louisiana 71272, USA
8ISS/INFN Roma1, gr. coll. Sanita’, Viale Regina Elena 299, 00161 Rome, Italy
9Rutgers University, Piscataway, New Jersey 08854, USA
10California Institute of Technology, Pasadena, California 91125, USA
11University of Kentucky, Lexington, Kentucky 40506, USA
12Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
Received 1 July 2004; published 15 November 2004
We extract the Bjorken integral Γ1p-n in the range 0.17<Q2<1.10 GeV2 from inclusive scattering of polarized electrons by polarized protons, deuterons, and 3He, for the region in which the integral is dominated by nucleon resonances. These data bridge the domains of the hadronic and partonic descriptions of the nucleon. In combination with earlier measurements at higher Q2, we extract the nonsinglet twist-4 matrix element f2.
©2004 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v93/e212001
DOI: 10.1103/PhysRevLett.93.212001
PACS: 13.60.Hb, 11.55.Hx, 12.38.Qk, 25.30.Rw
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