The two pion decay of the Roper resonance

Details The two pion decay of the Roper resonance The two pion decay of the Roper resonance

2002-09-03

arxiv.org/abs/nucl-th/0209009v2

Phys.Rev.C66:065201,2002

Physics

Nuclear Physics

Nuclear Theory

17 latex pages, 11 eps figures. A few misprints corrected. A few new references. Version accepted for publication in Phys. Rev

Scientific paper

10.1103/PhysRevC.66.065201

We evaluate the two pion decay of the Roper resonance in a model where explicit re-scattering of the two final pions is accounted for by the use of unitarized chiral perturbation theory. Our model does not include an explicit $\epsilon$ or $\sigma$ scalar-isoscalar meson decay mode, instead it generates it dynamically by means of the pion re-scattering. The two ways, explicit or dynamically generated, of introducing this decay channel have very different amplitudes. Nevertheless, through interference with the other terms of the model we are able to reproduce the same phenomenology as models with explicit consideration of the $\epsilon$ meson.

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