| Autor: |
G. B. Yodh, G. Quareni, I. Nadelhaft, T. B. Day, G. R. Charlton, R. A. Burnstein, A. Quareni-Vignudelli |
| Rok vydání: |
1965 |
| Předmět: |
|
| Zdroj: |
Physical Review. 137:B1044-B1052 |
| ISSN: |
0031-899X |
| DOI: |
10.1103/physrev.137.b1044 |
| Popis: |
Interactions of 683-MeV/c negative pions with protons were investigated using the BNL 14-in. hydrogen bubble chamber in a 17-kG field. Two thousand elastic scatterings were analyzed, yielding a cross section of 18.9\ifmmode\pm\else\textpm\fi{}1.0 mb. No evidence for powers of $cos\ensuremath{\theta}$ higher than the second was observed in the elastic angular distribution. The angular distribution obtained was $\frac{d\ensuremath{\sigma}}{d\ensuremath{\omega}}=(0.384\ifmmode\pm\else\textpm\fi{}0.026)+(1.70\ifmmode\pm\else\textpm\fi{}0.06)cos\ensuremath{\theta}+(3.36\ifmmode\pm\else\textpm\fi{}0.11){cos}^{2}\ensuremath{\theta}$ mb/sr. The single-pion production reactions ${\ensuremath{\pi}}^{\ensuremath{-}}+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}+{\ensuremath{\pi}}^{0}+p$ and ${\ensuremath{\pi}}^{\ensuremath{-}}+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}+{\ensuremath{\pi}}^{+}+n$ were studied in detail. A total of 441 ${\ensuremath{\pi}}^{0}$ productions and 833 ${\ensuremath{\pi}}^{+}$ productions were analyzed giving cross sections of 3.99\ifmmode\pm\else\textpm\fi{}0.50 and 7.50\ifmmode\pm\else\textpm\fi{}0.80 mb, respectively. The differential distributions for these inelastic processes are presented and compared with the predictions of the model of Olsson and Yodh. The distribution of events on the Dalitz plots for ${\ensuremath{\pi}}^{0}$ production is accounted for by the model. However, for the ${\ensuremath{\pi}}^{+}$ reaction, the model (so far developed) does not describe adequately the distribution of events on the Dalitz plot. In particular, the model fails to account for the enhancement at high (${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$) effective masses in $\ensuremath{\pi}\ensuremath{\pi}$ mass distribution. The center-of-mass angular distributions for ${\ensuremath{\pi}}^{0}$ and ${\ensuremath{\pi}}^{+}$ production reactions are presented and compared with the model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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