Measurement of Spin Correlation coefficients in p p --> d pi+
B. v. Przewoski, J. T. Balewski, J. Doskow, H. O. Meyer, R. E. Pollock, T. Rinckel, P. Thörngren-Engblom, A. Wellinghausen, W. Haeberli, B. Lorentz, F. Rathmann, B. Schwartz, T. Wise, W. W. Daehnick, Swapan K. Saha, P. V. Pancella
Abstract
The spin correlation coefficent combinations Axx+Ayy and Axx-Ayy, the spin correlation coefficients Axz and Azz, and the analyzing power were measured for p p --> d pi+ between center-of-mass angles 25 deg ≤ θ≤ 65 deg at beam energies of 350.5, 375.0 and 400.0 MeV. The experiment was carried out with a polarized internal target and a stored, polarized beam. Non-vertical beam polarization needed for the measurement of Azz was obtained by the use of solenoidal spin rotators. Near threshold, only a few partial waves contribute, and pion s- and p-waves dominate with a possible small admixture of d-waves. Certain combinations of the observables reported here are a direct measure of these d-waves. The d-wave contributions are found to be negligible even at 400.0 MeV.
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