Phys. Rev. C
58,
3722–3725
(1998)
Induced proton polarization for π0 electroproduction at Q2=0.126 GeV2/c2 around the Δ(1232) resonance
G. A. Warren et al. (The M.I.T.-Bates, OOPS, and FPP Collaborations)
Show All Authors/Affiliations
Hide All Authors/Affiliations
G. A. Warren7,*, R. Alarcon1, C. Armstrong4, B. Asavapibhop16, D. H. Barkhuff17,†, W. Bertozzi7, V. Burkert11, J. Chen7, J.-P. Chen11, J. R. Comfort1, D. Dale14, G. Dodson7, S. Dolfini1,‡, K. Dow7, M. Epstein3, M. Farkhondeh7, J. M. Finn4, S. Gilad7, R. W. Gothe2, X. Jiang16, M. Jones4, K. Joo7,§, A. Karabarbounis12, J. Kelly15, S. Kowalski7, C. Kunz2,†, D. Liu3, R. W. Lourie17,**, R. Madey6, D. Margaziotis3, P. Markowitz15, J. I. McIntyre4,††, C. Mertz1,‡‡, B. D. Milbrath17,a, R. Miskimen16, J. Mitchell11, S. Mukhopadhyay3, C. N. Papanicolas12, C. Perdrisat4, V. Punjabi8, L. Qin9, P. Rutt10, A. Sarty5, J. Shaw16, S.-B. Soong7, D. Tieger7, C. Tschalær7, W. Turchinetz7, P. Ulmer9, S. Van Verst6,b, C. Vellidis12, L. B. Weinstein9, S. Williamson13, R. J. Woo4,c, and A. Young1 (The M.I.T.-Bates, OOPS, and FPP Collaborations)
1Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287
2Department of Physics, Bonn University, Bonn, Germany
3Department of Physics and Astronomy, California State University, Los Angeles, California 90032
4Physics Department, College of William and Mary, Williamsburg, Virginia 23187
5Department of Physics, Florida State University, Tallahasse, Florida 32306
6Department of Physics, Kent State University, Kent, Ohio 44242
7Department of Physics, Laboratory for Nuclear Science and Bates Accelerator Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
8Department of Physics and Engineering, Norfolk State University, Norfolk, Virginia 23504
9Department of Physics, Old Dominion University, Norfolk, Virginia 23529
10Department of Physics, Rutgers University, Piscataway, New Jersey 08855
11Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606
12Institute of Accelerating Systems and Applications and Department of Physics, University of Athens, Athens, Greece
13Physics Department, University of Illinois, Urbana-Champagne, Illinois 61801
14Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
15Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
16Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003
17Institute for Nuclear and Particle Physics and Department of Physics, University of Virginia, Charlottesville, Virginia 22901
Received 5 December 1997; published in the issue dated December 1998
We present a measurement of the induced proton polarization Pn in π0 electroproduction on the proton around the Δ resonance. The measurement was made at a central invariant mass and a squared four-momentum transfer of W=1231 MeV and Q2=0.126 GeV2/c2, respectively. We measured a large induced polarization, Pn=-0.397±0.055±0.009. The data suggest that the scalar background is larger than expected from a recent effective Hamiltonian model.
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.58.3722
DOI:
10.1103/PhysRevC.58.3722
PACS:
13.88.+e, 13.60.Le, 13.60.Rj, 14.20.Gk
*Present address: Dept. für Physik und Astronomie, Universität Basel, CH-4056 Basel, Switzerland. †Present address: Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA 02139. ‡Present address: Hughes Missile Systems, Tucson, AZ 85750. §Present address: Thomas Jefferson National Accelerator Facility, Newport News, VA 23606. **Present address: Dept. of Physics and Astronomy, State University of New York Stony Brook, Stony Brook, NY 11794. ††Present address: Serin Physics Laboratory, Rutgers University, Piscataway, NJ 08855. ‡‡Present address: Institute of Accelerating Systems and Appli- cations and Department of Physics, University of Athens, Athens, Greece. aPresent address: Dept. of Physics and Astronomy, Eastern Kentucky University, Richmond, KY 40475. bPresent address: Washington State Department of Health, Olympia, WA 98504. cPresent address: TRIUMF, Vancouver, British Columbia, Canada V6T 2A3.
|
|
