Manifestation of the $P$-wave diproton resonance in single-pion production in $pp$ collisions

Abstract

It is demonstrated that many important features of single-pion production in $pp$ collisions at intermediate energies ($T_p\simeq 400$-$800$ MeV) can naturally be explained by supposing excitation of intermediate diproton resonances in $pp$ channels ${}^1{D}_2$, ${}^3{F}_3$ and ${}^3{P}_2$, in addition to conventional mechanisms involving an intermediate $\Delta$-isobar. We predict for the first time the crucial role of the ${}^3{P}_2$ diproton resonance, found in recent experiments on the single-pion production reaction $pp\to pp({}^1{S}_0){\pi }^0$, in reproducing the proper behavior of spin-correlation parameters in the reaction $pp\to d{\pi }^{+}$ which were poorly described by conventional meson-exchange models to date. The possible quark structure of the $P$-wave diproton resonances is also discussed.

Version accepted for publication in Physical Review D

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Cited by in corpus (3)

• On the History of Dibaryons and their Final Observation
• Nature of $\mathbf{S}$-wave $\mathbf{NN}$ interaction and dibaryon production at nucleonic resonance thresholds
• $P$-wave dibaryon resonances in $pp$ elastic scattering and near-threshold pion production