The reaction $Δ+N\to N+N+φ$ in ion-ion collisions

Details The reaction $Δ+N\to N+N+φ$ in ion-ion collisions The reaction $Δ+N\to N+N+φ$ in ion-ion collisions

2002-05-06

arxiv.org/abs/nucl-th/0205018v1

Phys.Rev. C67 (2003) 044004

Physics

Nuclear Physics

Nuclear Theory

10 pages 3 figures

Scientific paper

10.1103/PhysRevC.67.044004

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 independent 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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