Examination of the production of an isotensor dibaryon in the ppppπ+π reaction

P. Adlarson et al. (WASA-at-COSY Collaboration)
Phys. Rev. C 99, 025201 – Published 4 February 2019

Abstract

The quasifree ppppπ+π reaction has been measured by means of pd collisions at Tp=1.2GeV using the WASA detector setup at COSY enabling exclusive and kinematically complete measurements. Total and differential cross sections have been extracted for the energy region Tp=1.081.36 GeV (s=2.352.46GeV) covering thus the regions of N*(1440) and Δ(1232)Δ(1232) resonance excitations. Calculations describing these excitations by t-channel meson exchange as well as isospin relations based on the ppppπ0π0 data underpredict substantially the measured total cross section. The calculations are also at variance with specific experimental differential cross sections. An isotensor ΔN dibaryon resonance with I(JP)=2(1+) produced associatedly with a pion is able to overcome these deficiencies. Such a dibaryon was predicted by Dyson and Xuong [Phys. Rev. Lett. 13, 815 (1964)] and more recently calculated by A. Gal and H. Garcilazo [Nucl. Phys. A 928, 73 (2014)].

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  • Received 13 August 2018

DOI:https://doi.org/10.1103/PhysRevC.99.025201

©2019 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

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Vol. 99, Iss. 2 — February 2019

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