Phys. Rev. C 67, 028201 (2003) [3 pages]Search for neutral baryon resonances below pion threshold |
X. Jiang *, R. Gilman, and R. Ransome
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
P. Markowitz
Department of Physics, Florida International University, Miami, Florida 33199
T.-H. Chang
Department of Physics, University of Illinois at Urbana-Champaign, Champaign, Illinois 61820
C.-C. Chang
Department of Physics, University of Maryland, College Park, Maryland 20742
G. A. Peterson
Department of Physics, University of Massachusetts at Amherst, Amherst, Massachusetts 01003
D. W. Higinbotham, M. K. Jones, N. Liyanage †, and J. Mitchell
Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606
Received 12 August 2002; published 5 February 2003
The reaction p(e,e′π+)X0 was studied with two high-resolution magnetic spectrometers to search for narrow baryon resonances. A missing mass resolution of 2.0 MeV was achieved. A search for structures in the mass region of 0.97<MX0<1.06 GeV yielded no significant signal. The yield ratio of p(e,e′π+)X0/p(e,e′π+)n was determined to be (-0.35±0.35)×10-3 at 1.004 GeV and (0.34±0.42)×10-3 at 1.044 GeV. This measurement clearly demonstrated the potential of high-resolution missing mass searches in coincidence experiments.
©2003 The American Physical Society
URL: http://link.aps.org/abstract/PRC/v67/e028201
DOI: 10.1103/PhysRevC.67.028201
PACS: 25.30.Dh, 14.20.Gk, 13.60.Rj, 12.39.Mk
* Electronic address: jiang@jlab.org
† Current address: Department of Physics, University of Virginia, Charlottesville, VA 22901.
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