Relevance of nucleon spin in an amplitude analysis of reactions {pi}{sup {minus}}p{r_arrow}{pi}{sup 0}{pi}{sup 0}n and {pi}{sup {minus}}p{r_arrow}{eta}{eta}n
- Physics Department, Dawson College, Montreal, Quebec, H3Z 1A4 (CANADA)
The measurements of reactions {pi}{sup {minus}}p{r_arrow}{pi}{sup {minus}}{pi}{sup +}n and {pi}{sup +}n{r_arrow}{pi}{sup +}{pi}{sup {minus}}p on polarized targets at CERN found a strong dependence of pion production amplitudes on nucleon spin. Analyses of recent measurements of the {pi}{sup {minus}}p{r_arrow}{pi}{sup 0}{pi}{sup 0}n reaction on unpolarized targets by the GAMS Collaboration at 38 GeV/c and the BNL E852 Collaboration at 18 GeV/c use the assumption that pion production amplitudes do not depend on nucleon spin, in conflict with the CERN results on polarized targets. We show that measurements of {pi}{sup {minus}}p{r_arrow}{pi}{sup 0}{pi}{sup 0}n and {pi}{sup {minus}}p{r_arrow}{eta}{eta}n on unpolarized targets can be analyzed in a model-independent way in terms of four partial-wave intensities and three independent interference phases in the mass region where S and D waves dominate. We also describe model-independent amplitude analysis of the {pi}{sup {minus}}p{r_arrow}{pi}{sup 0}{pi}{sup 0}n reaction measured on a polarized target, both in the absence and in the presence of G-wave amplitudes. We suggest that high statistics measurements of reactions {pi}{sup {minus}}p{r_arrow}{pi}{sup 0}{pi}{sup 0}n and {pi}{sup {minus}}p{r_arrow}{eta}{eta}n be made on polarized targets at Protvino IHEP and at BNL, and that model-independent amplitude analyses of this polarized data be performed to advance hadron spectroscopy on the level of spin-dependent production amplitudes. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 477093
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 55; ISSN 0556-2821; ISSN PRVDAQ
- Country of Publication:
- United States
- Language:
- English
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