Résumé du preprint DAPNIA-02-78

DAPNIA-02-78
The reaction $\Delta+N\to N+N+\phi$ in ion-ion collisions
Michail P. Rekalo, Egle Tomasi-Gustafsson
We study the threshold $\phi$-meson production 
in the process $\Delta+N\to N+N+\phi$, which 
appears as a possible important mechanism in 
high energy nuclei-nuclei collisions. The 
isotopic invariance of the strong interaction 
and the selection rules due to P-parity and total
 angular momentum result in a general and model in
dependent parametrization of the spin structure of
 the matrix element in terms of three partial 
amplitudes. In the framework of one-pion exchange
 model these amplitudes can be derived in terms of
 the two threshold  partial amplitudes for the 
process $\pi+N\to N+\phi$. We predict the ratio 
of cross sections for $\phi-$meson production in 
$pp$- and $\Delta N$-collisions and the 
polarization properties of the $\phi$-meson, 
in $\Delta+N\to N+N+\phi$, as a function of a 
single parameter, which characterizes the relative
 role of transversal and longitudinal $\phi$-meson
 polarizations in the process $\pi+N\to N+\phi$.

 

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