Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-02-21
Phys.Rev. C68 (2003) 045201
Physics
Nuclear Physics
Nuclear Theory
10 pages, 7 figures, minor revision with one additional figure
Scientific paper
10.1103/PhysRevC.68.045201
It is shown that most of the available data on the $pp\to pp\eta$ reaction, including the invariant mass distributions in the $pp\to pp\eta$ reaction recently measured at COSY, can be understood in terms of the partial-wave amplitudes involving final $pp$ $S$ and $P$ states and the $\eta$ meson s-wave. This finding, together with the fact that results within a meson--exchange model are especially sensitive to the details of the excitation mechanism of the $S_{11}(1535)$ resonance, demonstrates the possibility of investigating the properties of this resonance in $NN$ collisions. The spin correlation function $C_{xx}$ is shown to disentangle the $S$- and $P$-wave contributions. It is also argued that spin correlations may be used to help constrain the contributions of the amplitudes corresponding to the final $pp$ $^3P_0$
Haidenbauer Johann
Hanhart Ch.
Nakayama Kazunori
Speth Josef
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