Isotensor Dibaryon in the pp→ppπ+π− Reaction?

Le résumé fourni par la source

Exclusive measurements of the quasifree $pp\ensuremath{\rightarrow}pp{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ reaction have been carried out at WASA@COSY by means of $pd$ collisions at ${T}_{p}=1.2\text{ }\text{ }\mathrm{GeV}$. Total and differential cross sections have been extracted covering the energy region ${T}_{p}=1.08--1.36\text{ }\text{ }\mathrm{GeV}$, which is the region of ${N}^{*}(1440)$ and $\mathrm{\ensuremath{\Delta}}(1232)\mathrm{\ensuremath{\Delta}}(1232)$ resonance excitations. Calculations describing these excitations by $t$-channel meson exchange are at variance with the measured differential cross sections and underpredict substantially the experimental total cross section. An isotensor $\mathrm{\ensuremath{\Delta}}N$ dibaryon resonance with $I({J}^{P})=2({1}^{+})$ produced associatedly with a pion is able to overcome these deficiencies.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.