Phys. Rev. Lett.
93,
152301
(2004)
[4 pages]
Measurement of the Generalized Forward Spin Polarizabilities of the Neutron
M. Amarian et al. Jefferson Lab E94010 Collaboration
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M. Amarian24, L. Auerbach20, T. Averett6,23, J. Berthot4, P. Bertin4, W. Bertozzi11, T. Black11, E. Brash16, D. Brown10, E. Burtin18, J. Calarco13, G. Cates15,22, Z. Chai11, J.-P. Chen6, Seonho Choi20, E. Chudakov6, E. Cisbani5, C. W. de Jager6, A. Deur4,6,22, R. DiSalvo4, S. Dieterich17, P. Djawotho23, J. M. Finn23, K. Fissum11, H. Fonvieille4, S. Frullani5, H. Gao11, J. Gao1, F. Garibaldi5, A. Gasparian3, S. Gilad11, R. Gilman6,17, A. Glamazdin9, C. Glashausser17, E. Goldberg1, J. Gomez6, V. Gorbenko9, J.-O. Hansen6, B. Hersman13, R. Holmes19, G. M. Huber16, E. Hughes1, B. Humensky15, S. Incerti20, M. Iodice5, S. Jensen1, X. Jiang17, C. Jones1, G. Jones8, M. Jones23, C. Jutier4,14, A. Ketikyan24, I. Kominis15, W. Korsch8, K. Kramer23, K. Kumar12,15, G. Kumbartzki17, M. Kuss6, E. Lakuriqi20, G. Laveissiere4, J. Lerose6, M. Liang6, N. Liyanage6,11, G. Lolos16, S. Malov17, J. Marroncle18, K. McCormick14, R. Mckeown1, Z.-E. Meziani20, R. Michaels6, J. Mitchell6, Z. Papandreou16, T. Pavlin1, G. G. Petratos7, D. Pripstein1, D. Prout7, R. Ransome17, Y. Roblin4, D. Rowntree11, M. Rvachev11, F. Sabatie14, A. Saha6, K. Slifer20, P. Souder19, T. Saito21, S. Strauch17, R. Suleiman7, K. Takahashi21, S. Teijiro21, L. Todor14, H. Tsubota21, H. Ueno21, G. Urciuoli5, R. Van der Meer6,16, P. Vernin18, H. Voskanian24, B. Wojtsekhowski6, F. Xiong11, W. Xu11, J.-C Yang2, B. Zhang11, and P. A. Żołnierczuk8 (Jefferson Lab E94010 Collaboration)
1California Institute of Technology, Pasadena, California 91125 USA
2Chungnam National University, Taejon 305-764, Korea
3Hampton University, Hampton, Virginia 23668 USA
4LPC IN2P3/CNRS, Université Blaise Pascal, F-63170 Aubière Cedex, France
5Istituto Nazionale di Fiscica Nucleare, Sezione Sanità, 00161 Roma, Italy
6Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 USA
7Kent State University, Kent, Ohio 44242 USA
8University of Kentucky, Lexington, Kentucky 40506 USA
9Kharkov Institute of Physics and Technology, Kharkov 310108, Ukraine
10University of Maryland, College Park, Maryland 20742 USA
11Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 USA
12University of Massachusetts-Amherst, Amherst, Massachusetts 01003 USA
13University of New Hampshire, Durham, New Hampshire 03824 USA
14Old Dominion University, Norfolk, Virginia 23529 USA
15Princeton University, Princeton, New Jersey 08544 USA
16University of Regina, Regina, SK S4S 0A2, Canada
17Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855 USA
18CEA Saclay, DAPNIA/SPHN, F-91191 Gif/Yvette, France
19Syracuse University, Syracuse, New York 13244 USA
20Temple University, Philadelphia, Pennsylvania 19122 USA
21Tohoku University, Sendai 980, Japan
22University of Virginia, Charlottesville, Virginia 22904 USA
23The College of William and Mary, Williamsburg, Virginia 23187 USA
24Yerevan Physics Institute, Yerevan 375036, Armenia
Received 2 June 2004; published 5 October 2004
The generalized forward spin polarizabilities γ0 and δLT of the neutron have been extracted for the first time in a Q2 range from 0.1 to 0.9 GeV2. Since γ0 is sensitive to nucleon resonances and δLT is insensitive to the Δ resonance, it is expected that the pair of forward spin polarizabilities should provide benchmark tests of the current understanding of the chiral dynamics of QCD. The new results on δLT show significant disagreement with chiral perturbation theory calculations, while the data for γ0 at low Q2 are in good agreement with a next-to-leading-order relativistic baryon chiral perturbation theory calculation. The data show good agreement with the phenomenological MAID model.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.152301
DOI:
10.1103/PhysRevLett.93.152301
PACS:
14.20.Dh, 11.55.Hx, 12.38.Qk, 25.30.–c
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