Mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies
- Laboratory of Theoretical Physics, S.L. Sobolev Institute for Mathematics, 630090, Novosibirsk 90 (Russia)
The main dynamical mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies, currently investigated at Serpukhov and Brookhaven, are considered in detail. It is shown that the observed forward peak in its differential cross section can be explained within the framework of the Regge pole model only by the conspiring {rho}{sub 2} Regge pole exchange. The tentative estimates of the absolute {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n reaction cross section at P{sub lab}{sup {pi}{sup {minus}}}=18 GeV/c are obtained: {sigma}{approx}200 nb and, in the forward direction, d{sigma}/dt{approx}940 nb/GeV{sup 2}. The contribution of the one pion exchange, which is forbidden by G parity and which can arise owing to the f{sub 0}{sup 0}(980){minus}a{sub 0}{sup 0}(980) mixing, is also estimated. The role of the Regge cuts in the nonflip helicity amplitude is briefly examined and the conclusion is made that the contributions of the cuts have to be inessential in comparison with the conspiring {rho}{sub 2} Regge pole exchange. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 531961
- Journal Information:
- Physical Review, D, Vol. 56, Issue 1; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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