Near-threshold production of $a_0(980)$-mesons in $\pi N$ and NN collisions and $a_0/f_0$-mixing

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 $K\bar{K}$ 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 $pp\to pp{K}^{+}{K}^{-}$. Effects of isospin violation in the reactions $pN\to d{a}_0$, $pd\to {}^3\mathrm{He}{/}^3\mathrm{H}{a}_0$, and $dd\to {}^4\mathrm{He}{a}_0$, which are induced by $a_0(980)$--$f_0(980)$ mixing, are also analyzed.

arXiv comment43 pages, including 16 eps figures, to be bublished in Phys. Atom. Nucl. (Yad. Fiz.) vol. 65, No. 11 (2002)

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Cited by in corpus (10)

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• Propagators of light scalar mesons
• Proposed Search for $a_0^0(980)-f_0(980)$ Mixing in Polarization Phenomena
• Search for the $a_0(980)-f_0(980)$ mixing in weak decays of $D_s/B_s$ mesons
• Manifestation of the $a_0^0(980)-f_0(980)$ mixing in the reaction ${\pi }^{-}p\to \eta {\pi }^{0}n$ on a polarized target
• Mechanisms of the isospin-breaking decay $f_1(1285)\to f_0(980){\pi }^0\to {\pi }^{+}{\pi }^{-}{\pi }^0$
• The $D_s^{+}\to a_0(980)e^{+}{\nu }_e$ reaction and the $a_0(980)-f_0(980)$ mixing
• Strong isospin symmetry breaking in light scalar meson production
• Exclusive $f_1(1285)$ meson production for energy ranges available at the GSI-FAIR with HADES and PANDA
• Study of $a_0^0(980)$-$f_0(980)$ mixing from $a_0(1450)\to a_0^0(980)f_0(500)\to {\pi }^{+}{\pi }^{-}{f}_0(500)$