Production of $a_0$-mesons in pp and pn reactions

Details Production of $a_0$-mesons in pp and pn reactions Production of $a_0$-mesons in pp and pn reactions

2001-07-27

arxiv.org/abs/nucl-th/0107071v2

J.Phys.G28:2423-2442,2002

Physics

Nuclear Physics

Nuclear Theory

26 pages, including 11 eps figures, to be bublished in J. Phys. G

Scientific paper

10.1088/0954-3899/28/9/307

We investigate the cross section for the reaction $NN \to NNa_0$ near threshold and at medium energies. An effective Lagrangian approach with one-pion exchange is applied to analyze different contributions to the cross section for different isospin channels. The Reggeon exchange mechanism is also considered. The results are used to calculate the contribution of the $a_0$ meson to the cross sections and invariant $K \bar K$ mass distributions of the reactions $pp\to pn K^+\bar K^0$ and $pp\to pp K^+K^-$. It is found that the experimental observation of $a_0^+$ mesons in the reaction $pp\to pn K^+\bar K^0$ is much more promising than the observation of $a_0^0$ mesons in the reaction $pp\to pp K^+K^-$.

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