Study of π^{-}p \to ηn at low energies in a chiral constituent quark model

Details Study of π^{-}p \to ηn at low energies in a chiral constituent quark model Study of π^{-}p \to ηn at low energies in a chiral constituent quark model

2007-06-25

arxiv.org/abs/0706.3543v3

Phys.Rev.C76:065205,2007

Physics

Nuclear Physics

Nuclear Theory

17 pages, 5 figures. Version accepted by PRC. Some changes in the t-channel due to an error in the code

Scientific paper

10.1103/PhysRevC.76.065205

A chiral quark model approach is extended to the study of the $\pi N$ scattering at low energies. The process of $\pi^{-}p \to \eta n$ near threshold is investigated. The model is successful in describing the differential cross sections and total cross section near the $\eta$ production threshold. The roles of the resonances in $n\leq 2$ shells are clarified. Near threshold, the $S_{11}(1535)$ dominates the reactions, while the interferences from the $S_{11}(1650)$ turn out to be destructive around $W\lesssim 1.6$ GeV. The $D_{13}(1520)$ is crucial to give correct shapes of the differential cross sections. The nucleon pole term contributions are significant. The $P_{11}(1710)$ plays an important role around the c.m. energy $W=1.7$ GeV, it is crucial to produce an enhancement in the region of $W>1.6$ GeV as suggested by the data for total cross section. The $t$-channel is negligible in the reactions.

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