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- W2301909043 abstract "A study of $ensuremath{pi}N$ scattering in the ${P}_{11}$ state is presented within the framework of the unitary $f$ matrix, or boundary-condition model. Inelastic channels treated are $ensuremath{sigma}N$ and $ensuremath{pi}{N}^{*}$, where $ensuremath{sigma}$ is a $I=0$, $J={0}^{+}$ $ensuremath{pi}ensuremath{pi}$ pair. The mass spread of the inelastic channel is taken into account in a unitary manner. It is apparent from an examination of the fits to the data that the $ensuremath{sigma}N$ channel is vastly preferred as an inelastic mode; the reasons are fully discussed in the text. The crossover of the phase shift at 175 MeV is seen to be impossible with a conventional force input. From a study of eigenphases we conclude that there is no Breit-Wigner resonance in any eigenchannel. Also, by means of the eigenphase representation, we demonstrate a source of possible discrepancies in recent phase-shift analyses. The value of ${m}_{ensuremath{sigma}}$ obtained for a best fit, 550 MeV, is compared with other values obtained by various authors. Finally, we examine the effects of the ${P}_{11}$ object on the Gell-Mann-Okubo mass formula." @default.
- W2301909043 created "2016-06-24" @default.
- W2301909043 creator A5082527739 @default.
- W2301909043 date "1967-02-25" @default.
- W2301909043 modified "2023-09-23" @default.
- W2301909043 title "Some Aspects ofπNScattering in theP11State" @default.
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- W2301909043 doi "https://doi.org/10.1103/physrev.154.1558" @default.
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