APS » PROLA » Phys. Rev. C » Volume 58 » Issue 6

Phys. Rev. C 58, 3722 - 3725 (1998)

Induced proton polarization for π0 electroproduction at Q2=0.126 GeV2/c2 around the Δ(1232) resonance
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G. A. Warren et al. (The M.I.T.-Bates, OOPS, and FPP Collaborations)
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Received 5 December 1997

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/abstract/PRC/v58/p3722
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.
Present address: Dept. of Physics and Astronomy, Eastern Kentucky University, Richmond, KY 40475.
a Present address: Washington State Department of Health, Olympia, WA 98504.
b Present address: TRIUMF, Vancouver, British Columbia, Canada V6T 2A3.

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