Hidden dibaryons in one- and two-pion production in NN collisions

Abstract

Processes of one- and two-pion production in $NN$ collisions are considered in connection with excitation of intermediate dibaryon resonances. In particular, relative contributions of the conventional meson-exchange and dibaryon excitation mechanisms in the reaction $pp\to d{\pi }^{+}$ are investigated in detail. Inclusion of the intermediate isovector dibaryon resonances is shown to essentially improve the description of experimental data for this reaction, provided the soft meson-baryon form factors consistent with $\pi N$ elastic scattering are used. Manifestation of the intermediate isoscalar and isovector dibaryons in the two-pion production processes is also studied. The role of the isovector dibaryon resonances in the reaction $pp\to pp\pi \pi$ is discussed for the first time. An explanation of the observed strong differences between two-pion production cross sections in $pn$ and $pp$ collisions based in part on the analysis of dibaryon structure is suggested.

Version accepted for publication in Nuclear Physics A

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Cited by in corpus (19)

• On the History of Dibaryons and their Final Observation
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• The $d^{\ast }$(2380) dibaryon resonance width and decay branching ratios
• Non-strange Dibaryon Resonances Observed in the $\gamma d\to {\pi }^0{\pi }^{0}d$ Reaction
• Decay width of $d^{\ast }(2380)\to NN\pi$ process in a chiral constituent quark model
• Dibaryons: Molecular versus Compact Hexaquarks
• Manifestation of the $P$-wave diproton resonance in single-pion production in $pp$ collisions
• Dibaryon resonances and short-range $NN$ interaction
• To the nature of nuclear force
• On the form factors of $d^{\ast }(2380)$
• On the charge distribution of $d^{\ast }(2380)$
• MESON2016 -- Concluding Remarks
• Photo-absorption on deuteron contributed by d^*(2380) resonance
• $P$-wave dibaryon resonances in $pp$ elastic scattering and near-threshold pion production
• Isospin symmetry breaking in double-pion production in the region of $d^{\ast }(2380)$ and the scalar $\sigma$ meson
• A Study of Degenerate Two-Body and Three-Body Coupled-Channel Systems -Renormalized Effective AGS Equations and Near-Threshold Resonances-
• Centrifugal effects in N-Delta states
• Possible dibaryon production at $\bar{\mathrm{P}}$anda with a Lagrangian approach
• Structure and Width of the d*(2380) Dibaryon