Nucleon resonances in $\gamma p\to \omega p$ reaction

Abstract

The most recent high-precision data on spin observables $\Sigma$, $T$, $P^{\prime }$, $E$, $F$ and $H$ reported by the CLAS Collaboration together with the previous data on differential cross sections and spin-density-matrix elements reported by the CLAS, A2, GRAAL, SAPHIR and CBELSA/TAPS Collaborations for the reaction $\gamma p\to \omega p$ are analyzed within an effective Lagrangian approach. The reaction amplitude is constructed by considering the $t$-channel $\pi$ and $\eta$ exchanges, the $s$-channel nucleon and nucleon resonances exchanges, the $u$-channel nucleon exchange and the generalized contact current. The latter accounts effectively for the interaction current and ensures that the full photoproduction amplitude is gauge invariant. It is shown that all the available CLAS data can be satisfactorily described by considering the $N(1520)3/2^{-}$, $N(1700)3/2^{-}$, $N(1720)3/2^{+}$, $N(1860)5/2^{+}$, $N(1875)3/2^{-}$, $N(1895)1/2^{-}$ and $N(2060)5/2^{-}$ resonances in the $s$-channel. The parameters of these resonances are extracted and compared with those quoted by PDG.

22 pages, 17 figures, version to appear in PRD

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Cited by in corpus (11)

• Light Baryon Spectroscopy
• Effects of $N(2000){5/2}^{+}$ on $\gamma p\to K^{+}\Lambda (1405)$
• Photoproduction $\gamma p\to K^{+}\Lambda (1520)$ in an effective Lagrangian approach
• Analysis of the data on spin density matrix elements for $\gamma p\to K^{\ast +}\Lambda$
• Investigation of electroproduction of $\varphi$ mesons off protons
• Analysis of the differential cross section and photon beam asymmetry data for $\gamma p\to {\eta }^{\prime }p$
• Gauge invariance of meson photo- and electroproduction currents revisited
• Combined analysis of the $\gamma n\to K^0{\Sigma }^0$ and $\gamma n\to K^{+}{\Sigma }^{-}$ reactions
• Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction
• Combined analysis of the data on cross sections and spin density matrix elements for $K^{\ast }\Sigma$ photoproduction reactions
• Photoproduction $\gamma p\to K^{+}\Lambda (1690)$ in an effective Lagrangian approach