Phys. Rev. Lett.
91,
052301
(2003)
[5 pages]
Polarization Transfer in the 4He(e⃗,e′p⃗)3H Reaction up to Q2=2.6 (GeV/c)2
S. Strauch et al.
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S. Strauch1,*, S. Dieterich1, K. A. Aniol2, J. R. M. Annand3, O. K. Baker4,5, W. Bertozzi6, M. Boswell7, E. J. Brash8, Z. Chai6, J.-P. Chen5, M. E. Christy4, E. Chudakov5, A. Cochran4, R. De Leo9, R. Ent5, M. B. Epstein2, J. M. Finn10, K. G. Fissum11, T. A. Forest12, S. Frullani13, F. Garibaldi13, A. Gasparian4, O. Gayou10,14, S. Gilad6, R. Gilman1,5, C. Glashausser1, J. Gomez5, V. Gorbenko15, P. L. J. Gueye4, J. O. Hansen5, D. W. Higinbotham6, B. Hu4, C. E. Hyde-Wright12, D. G. Ireland3, C. Jackson4, C. W. de Jager5, X. Jiang1, C. Jones4, M. K. Jones16, J. D. Kellie3, J. J. Kelly16, C. E. Keppel4, G. Kumbartzki1, M. Kuss5, J. J. LeRose5, K. Livingston3, N. Liyanage5, S. Malov1, D. J. Margaziotis2, D. Meekins17, R. Michaels5, J. H. Mitchell5, S. K. Nanda5, J. Nappa1, C. F. Perdrisat10, V. A. Punjabi18, R. D. Ransome1, R. Roché17, G. Rosner3, M. Rvachev6, F. Sabatie12, A. Saha5, A. Sarty17, J. M. Udias19, P. E. Ulmer12, G. M. Urciuoli13, J. F. J. van den Brand20, J. R. Vignote19, D. P. Watts3, L. B. Weinstein12, K. Wijesooriya21, and B. Wojtsekhowski5
1Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
2California State University, Los Angeles, California 90032, USA
3University of Glasgow, Glasgow, G12 8QQ, Scotland, United Kingdom
4Hampton University, Hampton, Virginia 23668, USA
5Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
6Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
7Randolph-Macon Woman’s College, Lynchburg, Virginia 24503, USA
8University of Regina, Regina, Saskatchewan, Canada S4S 0A2
9INFN, Sezione di Bari and University of Bari, I-70126, Bari, Italy
10College of William and Mary, Williamsburg, Virginia 23187, USA
11University of Lund, SE-221 00 Lund, Sweden
12Old Dominion University, Norfolk, Virginia 23529, USA
13INFN, Sezione Sanitá and Istituto Superiore di Sanitá, Laboratorio di Fisica, I-00161 Rome, Italy
14Université Blaise Pascal, F-63177 Aubière, France
15Kharkov Institute of Physics and Technology, Kharkov 310108, Ukraine
16University of Maryland, College Park, Maryland 20742, USA
17Florida State University, Tallahassee, Florida 32306, USA
18Norfolk State University, Norfolk, Virginia 23504, USA
19Universidad Complutense de Madrid, E-28040 Madrid, Spain
20Vrije Universiteit, NL-1081 HV Amsterdam, The Netherlands
21University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Received 6 November 2002; revised 5 May 2003; published 29 July 2003
We have measured the proton recoil polarization in the 4He(e⃗ ,e′p⃗)4H reaction at Q2=0.5, 1.0, 1.6, and 2.6 (GeV/c)2. The measured ratio of polarization transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model. In addition, the measured induced polarizations agree reasonably well with the fully relativistic calculation indicating that the treatment of final-state interactions is under control.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.052301
DOI:
10.1103/PhysRevLett.91.052301
PACS:
13.40.Gp, 13.88.+e, 25.30.Dh, 27.10.+h
*Present address: Department of Physics, The George Washington University, Washington, D.C. 20052, USA.
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