Near-Threshold Production of a0(980) Mesons in piN and NN Collisions and a0-f0 Mixing

Kondratyuk, L. A.; Grishina, V. Yu.; Bratkovskaya, E. L.; Ströher, H.; Cassing, W.; Büscher, M.

doi:10.1134/1.1540670

Journal Article

Near-Threshold Production of a0(980) Mesons in piN and NN Collisions and a0-f0 Mixing

Kondratyuk, L. A. ; Bratkovskaya, E. L. ; Grishina, V. Y. ; Büscher, M.FZJ* ; Cassing, W. ; Ströher, H.FZJ*

2003
AIP New York, NY

Physics of atomic nuclei 66, 152 - 171 (2003) [10.1134/1.1540670]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10720 doi:10.1134/1.1540670

Abstract: We consider near-threshold a(0) (980)-meson production in piN 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 piN reactions are used to calculate the contribution of the a(0) meson to the cross sections and invariant K (K) over bar mass distributions of the reactions pp --> pnK(+)(K) over bar (0) and pp --> ppK(+)K(-). It is found that the experimental observation of a(0)(+) mesons in the reaction pp --> pnK(+)(k) over bar (0) is much more promising than the observation of a(0)(0) mesons in the reaction pp --> ppK(+)K(-). Effects of isospin violation in the reactions pN --> da(0), pd --> He-3(H-3)a(0), and dd --> (4)Hea(0), which are induced by a(0)(980)-f(0)(980) mixing, are also analyzed. (C) 2003 MAIK "Nauka/Interperiodica".

Keyword(s): pi nucleon: exclusive reaction ; nucleon nucleon: exclusive reaction ; a0(980): hadroproduction ; a0(980): hadronic decay ; K: pair production ; eta ; effective Lagrangian ; pi: exchange ; Regge poles ; background ; interference: (a0(980) f0(975)) ; isospin: violation ; p deuteron: exclusive reaction ; Feynman graph ; differential cross section: momentum transfer ; channel cross section: energy dependence ; mass spectrum: (K anti-K) ; mass spectrum: (eta pi0) ; differential cross section: angular dependence ; differential cross section: momentum dependence ; numerical calculations: interpretation of experiments ; pi nucleon --> a0(980) nucleon ; nucleon nucleon --> a0(980) 2nucleon ; a0(980) --> K anti-K ; a0(980) --> eta pi