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| Hauptseite > Publikationsdatenbank > Examination of the production of an isotensor dibaryon in the p p → p p π + π − reaction |
| Hauptseite > Publikationsdatenbank > Examination of the production of an isotensor dibaryon in the p p → p p π + π − reaction |
| Journal Article | FZJ-2019-05610 |
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2019
Inst.
Woodbury, NY
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Please use a persistent id in citations: http://hdl.handle.net/2128/23456 doi:10.1103/PhysRevC.99.025201
Abstract: The quasifree pp→ppπ+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=1.08–1.36 GeV (√s=2.35–2.46GeV) 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 pp→ppπ0π0 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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