Pion-nucleon scattering is investigated within a meson-exchange model which includes all those reaction channel that can decay into two pions and a nucleon. The Roper resonance N*(1440), in this model, turns out to be a quasibound state of two pions correlated in a relative S-state and the nucleon.
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Univ Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, AustraliaUniv Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, Australia
Wu, Jia-jun
Leinweber, Derek B.
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Univ Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, AustraliaUniv Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, Australia
Leinweber, Derek B.
Liu, Zhan-wei
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Univ Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, Australia
Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R ChinaUniv Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, Australia
Liu, Zhan-wei
Thomas, Anthony W.
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Univ Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, Australia
Univ Adelaide, Dept Phys, ARC Ctr Excellence Particle Phys Terascale CoEPP, Adelaide, SA 5005, AustraliaUniv Adelaide, Dept Phys, Special Res Ctr Subat Struct Matter CSSM, Adelaide, SA 5005, Australia