An Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction?

Abstract

Exclusive measurements of the quasi-free $pp\to pp{\pi }^{+}{\pi }^{-}$ reaction have been carried out at WASA@COSY by means of $pd$ collisions at $T_p$ = 1.2 GeV. Total and differential cross sections have been extracted covering the energy region $T_p=1.08-1.36$ GeV, which is the region of $N^{\ast }(1440)$ and $\Delta (1232)\Delta (1232)$ 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 $\Delta N$ dibaryon resonance with $I(J^P)=2(1^{+})$ produced associatedly with a pion is able to overcome these deficiencies.

arXiv commentarXiv admin note: substantial text overlap with arXiv:1803.03192

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• Dibaryons: Molecular versus Compact Hexaquarks
• Nature of $\mathbf{S}$-wave $\mathbf{NN}$ interaction and dibaryon production at nucleonic resonance thresholds
• To the nature of nuclear force
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• Resonant behavior of the $pp\to \{pp{\}}_s{\pi }^0$ reaction at the energy $\sqrt{s}$ = 2.65 GeV
• Structure and Width of the d*(2380) Dibaryon