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We study the pion-nucleon P_33 and P_11 scattering, where the Delta and theRoper resonances are seen, respectively. We use the Lippmann-Schwinger equationextended to couple to a one-body state, and investigate nature of theseresonances by taking and omitting a one-baryon state into account. We seevalidity and puzzle of the standard quark model interpretation, for the Deltaand the Roper resonances, respectively.

Pion-nucleon P_33 and P_11 scatterings in the Lippmann-Schwinger approach