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• W2587788794 abstract "A combined analysis of the reactions $pi^+pto pi^+p$, $pi^-pto pi^-p$ and $pi^-pto pi^0n$ is carried out with a chiral quark model. The observations are reasonably described from the $Delta(1232)$ resonance region up to the $N(1440)$ resonance region. Besides the $Delta(1232)P_{33}$, a confirmed role of $N(1440)P_{11}$ is found in the polarizations of the $pi^-pto pi^-p$ and $pi^-ptopi^0n$ reactions. It is found that the $N(1440)Npi$ and $Delta(1232)Npi$ couplings are about $1.7$ and $4.8$ times larger than the expectations from the simple quark model, respectively, which may suggest the unusual property of $N(1440)P_{11}$ and deficiency of the simple quark model in the description of $N(1440)P_{11}$ and $Delta(1232)P_{33}$. The $t$- and $u$-channel backgrounds have notable contributions to the $pi^+ prightarrowpi^+ p$ reaction, while in the $pi^-prightarrow pi^- p,pi^0 n$ reactions, the $s$-channel nucleon and $t$- and $u$-channel backgrounds play crucial roles." @default.
• W2587788794 created "2017-02-24" @default.
• W2587788794 creator A5030262088 @default.
• W2587788794 creator A5044355293 @default.
• W2587788794 creator A5055577929 @default.
• W2587788794 date "2017-05-10" @default.
• W2587788794 modified "2023-10-10" @default.
• W2587788794 title "Quark model study of the πN→πN reactions up to the N(1440) resonance region" @default.
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