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Phys. Rev. C 63, 064002 (2001) [24 pages]

Complete set of polarization observables in p⃗p⃗→ppπ0 close to threshold

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H. O. Meyer*, A. Wellinghausen, J. T. Balewski, J. Doskow, R. E. Pollock, B. v. Przewoski, T. Rinckel, and P. Thörngren-Engblom†
Indiana University Cyclotron Facility, Bloomington, Indiana 47405

L. D. Knutson, W. Haeberli, B. Lorentz‡, F. Rathmann§, B. Schwartz, and T. Wise
Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706

W. W. Daehnick and Swapan K. Saha**
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260

P. V. Pancella
Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008

Received 5 January 2001; published 2 May 2001

In a kinematically complete experiment we have measured the two analyzing powers and the five spin correlation coefficients of the reaction p⃗p⃗→ppπ0 as a function of all five parameters of the three-body final state for bombarding energies between 325 and 400 MeV. The data are in disagreement with the theoretical predictions available at this time. Below 400 MeV, fewer than a dozen complex partial-wave amplitudes are likely to be significant, and it is expected that the present experimental information constrains these amplitudes. We also describe the formalism for an expansion of the spin observables into a complete set of angular functions and use this to completely characterize the polarization information obtainable from reactions with polarized spin-1/2 collision partners and a three-body final state.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.63.064002
DOI:
10.1103/PhysRevC.63.064002
PACS:
24.70.+s, 24.80.+y, 25.10.+s, 29.20.Dh

*Email address: meyer@iucf.indiana.edu

†Present address: Department of Radiation Sciences, Uppsala University, Sweden.

‡Present address: Forschungszentrum Jülich, Germany.

§Present address: Universität Erlangen-Nürnberg, Erlangen, Germany.

**Present address: Bose Institute, Calcutta, India.

 
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