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We study the S-wave interaction of mesons with baryons in the strangeness S = 0 sector in a coupled channel unitary approach. The basic dynamics is drawn from the lowest order meson-baryon chiral Lagrangians. Small modifications inspired by models with explicit vector meson exchange in the t channel are also considered. In addition the pipiN channel is included and shown to have an important repercussion in the results, particularly in the isospin 3/2 sector. The N*(1535) resonance is dynamically generated and appears as a pole in the second Riemann sheet with its mass, width, and branching ratios in fair agreement with experiment. A Delta(1620) resonance also appears as a pole at the right position although with a very large width, coming essentially from the coupling to the pipiN channel, in qualitative agreement with experiment

physical review. c. nuclear physics/physical review. c, nuclear physics

Chiral unitary approach to<i>S</i>-wave meson baryon scattering in the strangeness<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>0</mml:mn><mml:mn /></mml:math>sector

Chiral unitary approach toS-wave meson baryon scattering in the strangenessS=0sector