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Near-threshold production of $a_0(980)$-mesons in $pi N$ and NN collisions and $a_0/f_0$-mixing | | L. A. Kondratyuk
; E. L. Bratkovskaya
; V. Yu. Grishina
; M. Buescher
; W. Cassing
; H. Stroeher
; | | Date: |
12 Jul 2002 | | Journal: | Phys.Atom.Nucl. 66 (2003) 152-171; Yad.Fiz. 66 (2003) 155-174 | | Subject: | nucl-th | | Affiliation: | ITEP, Moscow), E. L. Bratkovskaya (Univ. Frankfurt), V. Yu. Grishina (INR, Moscow), M. Buescher (FZ Juelich), W. Cassing (Univ. Giessen) and H. Stroeher (FZ Juelich | | Abstract: | We consider near-threshold $a_0(980)$-meson production in $pi N$ and $NN$ collisions. 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 evaluated for comparison. The results from $pi N$ reactions are used to calculate the contribution of the $a_0$ meson to the cross sections and invariant $K ar K$ mass distributions of the reactions $pp o pn K^+ar K^0$ and $pp o pp K^+K^-$. It is found that the experimental observation of $a_0^+$ mesons in the reaction $pp o pn K^+ar K^0$ is much more promising than the observation of $a_0^0$ mesons in the reaction $pp o pp K^+K^-$. Effects of isospin violation in the reactions $pN o d a_0$, $pd o mathrm{^3He/^3H} a_0$, and $ dd o mathrm{^4He} a_0$, which are induced by $a_0(980)$--$f_0(980)$ mixing, are also analyzed. | | Source: | arXiv, nucl-th/0207033 | | Services: | Forum | Review | PDF | Favorites | |
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