Phys. Rev. C
70,
035203
(2004)
[9 pages]
Near threshold electroproduction of the ω meson at Q2≈0.5 GeV2
P. Ambrozewicz et al.
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P. Ambrozewicz1,2,*, J. Mitchell2, J. Dunne2,†, P. Markowitz3,2, C. J. Martoff1, J. Reinhold4,*, B. Zeidman4, D. J. Abbott2, A. Ahmidouch5,6,‡, C. S. Armstrong7, J. Arrington4, K. A. Assamagan8,5, K. Bailey4, O. K. Baker5,2, S. Beedoe9, H. Breuer10, R. Carlini2, J. Cha5, G. Collins10, C. Cothran11, W. J. Cummings4, S. Danagoulian9,2, D. Day11, F. Duncan10, D. Dutta12,§, T. Eden5, R. Ent2, L. Ewell10,**, H. T. Fortune13, H. Gao4,††, D. F. Geesaman4, P. Gueye5, K. K. Gustafsson10,‡‡, J.-O. Hansen4,a, W. Hinton5, C. E. Keppel5,2, A. Klein14, D. Koltenuk13,b, D. J. Mack2, R. Madey5,6, D. G. Meekins7,b, H. Mkrtchyan15, R. M. Mohring10,c, S. K. Mtingwa9, G. Niculescu5,d, I. Niculescu5,d, T. G. O’Neill4,e, D. Potterveld4, J. W. Price16, B. A. Raue3, P. Roos10, G. Savage5, R. Sawafta9,2, R. E. Segel12, S. Stepanyan17, V. Tadevosyan17, L. Tang5,2, B. P. Terburg18, S. Wood2, C. Yan2, and B. Zihlmann11,f
1Temple University, Philadelphia, Pennsylvania 19122, USA
2Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
3Florida International University, Miami, Florida 33199, USA
4Argonne National Laboratory, Argonne, Illinois 60439, USA
5Hampton University, Hampton, Virginia 23668, USA
6Kent State University, Kent, Ohio 44242, USA
7College of William and Mary, Williamsburg, Virginia 23187, USA
8Brookhaven National Laboratory, Upton, New York 11973, USA
9North Carolina A & T State University, Greensboro, North Carolina 27411, USA
10University of Maryland, College Park, Maryland 20742, USA
11University of Virginia, Charlottesville, Virginia 22904, USA
12Northwestern University, Evanston, Illinois 60201, USA
13University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
14Old Dominion University, Norfolk, Virginia 23529, USA
15Yerevan Physics Institute, Yerevan, Armenia 375036
16Rensselaer Polytechnic Institute, Troy, New York 12180, USA
17Yerevan Physics Institute, Yerevan, Armenia 375306
18University of Illinois, Champaign-Urbana, Illinois 61801, USA
Received 2 March 2004; published 20 September 2004
Electroproduction of the ω meson was investigated in the 1H(e,e′p)ω reaction. The measurement was performed at a four-momentum transfer Q2≈0.5 GeV2. Angular distributions of the virtual photon-proton center-of-momentum cross sections have been extracted over the full angular range. These distributions exhibit a strong enhancement over t-channel parity exchange processes in the backward direction. According to a newly developed electroproduction model, this enhancement provides significant evidence of resonance formation in the γ*p→ωp reaction channel.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.035203
DOI:
10.1103/PhysRevC.70.035203
PACS:
25.30.Rw, 25.30.Dh, 13.60.Le
*Present address: Florida International University, Miami, FL 33199. †Present address: Mississippi State University, Starkville, MI 39762. ‡Present address: North Carolina A & T State University, Greensboro, NC 27411. §Present address: Duke University, Durham, NC 27708. **Present address: University of Michigan Medical Center, Ann Arbor, MI 48109. ††Present address: Duke University, Durham, NC 27708. ‡‡Present address: University of Helsinki, Helsinki, Finland. aPresent address: Thomas Jefferson National Accelerator Facility, Newport News, VA. 23606. bPresent address: MIT Lincoln Laboratory, Lexington, MA 02420. cPresent address: Millennium Cell, Inc., Eatontown, NJ 07724. dPresent address: James Madison University, Harrisonburg, VA 22807. ePresent address: Sun Microsystems, Inc. Mountain View, CA 94043. fPresent address: University of Gent, B-9000 Gent, Belgium.
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