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π−p Elastic Scattering between 1.7 and 2.5 GeV/c

Roger E. Hill*, Norman E. Booth†, and Robert J. Esterling‡

Shigeki Suwa§ and Akihiko Yokosawa

  • Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637

  • Argonne National Laboratory, Argonne, Illinois 60440

  • *Present address: Rutherford Laboratory, Chilton, Didcot, Berkshire, England.
  • †Also of the Physics Department.
  • ‡Present address: Department of Physics, Rutgers, The State University, New Brunswick, N. J. 08903.
  • §Present address: Institute for Nuclear Study, Tokyo University, Tanashi, Tokyo, Japan.
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Phys. Rev. D 1, 729 – Published 1 February, 1970

DOI: https://doi.org/10.1103/PhysRevD.1.729

Abstract

The polarization and the differential cross section in π−p elastic scattering have been measured at incident pion laboratory momenta of 1.70, 1.88, 2.07, 2.27, and 2.50 GeV/c. The experiment was carried out at the Argonne zero-gradient synchrotron with a polarized proton target. Details of the apparatus and data analysis are presented here together with the final results. A partial-wave analysis of the data has verified the JP=72+ assignment for the Δ(1950) and established a JP=72− assignment for the N(2190). It does not support a JP=112+ assignment for the Δ(2460), nor does it give support for some of the possible resonances found in the CERN phase-shift analysis. Apart from the resonance behavior, the partial-wave analysis reveals several new features. We find a striking correlation among the various partial-wave amplitudes at the highest energy, which is different for J=l+12 and J=l−12. In addition, several fixed-(−t) features of high-energy scattering emerge in the energy region of this analysis.

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Phys. Rev. D 1, 729– Published 1 February, 1970
  • Received 12 September 1969

© 1970 American Physical Society

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