First Measurements of the Double-Polarization Observables $F$, $P$, and $H$ in $\omega$ Photoproduction off Transversely Polarized Protons in the $N^{\ast }$ Resonance Region

Abstract

First measurements of double-polarization observables in $\omega$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Acceptance Spectrometer (CLAS) FROST experiment at Jefferson Lab. The beam-target asymmetry $F$ has been measured using circularly polarized, tagged photons in the energy range 1200 - 2700 MeV, and the beam-target asymmetries $H$ and $P$ have been measured using linearly polarized tagged photons in the energy range 1200 - 2000 MeV. These measurements significantly increase the database on polarization observables. The results are included in two partial-wave analyses and reveal significant contributions from several nucleon ($N^{\ast }$) resonances. In particular, contributions from new $N^{\ast }$ resonances listed in the Review of Particle Properties are observed, which aid in reaching the goal of mapping out the nucleon resonance spectrum.

arXiv commentTwo authors added, figures updated

References in corpus (22)

• Baryon spectroscopy
• Progress Toward Understanding Baryon Resonances
• Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV II: photon-induced results
• Coupled-channel analysis of the $\omega$-meson production in $\pi N$ and $\gamma N$ reactions for c.m. energies up to 2 GeV
• Nucleon resonances in omega photoproduction
• Partial decay widths of baryons in the spin-momentum operator expansion method
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons
• The Jefferson Lab Frozen Spin Target
• Nucleonic resonance excitations with linearly polarized photon in $\gamma p\to \omega p$
• Effective Lagrangian approach to the omega meson photoproduction near threshold
• Partial wave analysis of the reaction gamma p -> p omega$ and the search for nucleon resonances
• Polarization observables in vector meson photoproduction
• Nucleon resonances in $\gamma p\to K^{\ast +}\Lambda$
• Photoproduction of ω Mesons off the Proton
• Multivariate side-band subtraction using probabilistic event weights
• Effects of $\Delta (1905)5/2^{+}$ on $K^{\ast }\Sigma$ photoproduction
• $N^{\ast }$ decays to $N\omega$ from new data on $\gamma p\to \omega p$
• Measurement of the helicity asymmetry $E$ in $\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$ photoproduction
• Beam asymmetry in near threshold omega photoproduction off the proton
• Measurement of double polarisation asymmetries in $\omega$-photoproduction
• Measurement of the beam asymmetry $\Sigma$ and the target asymmetry $T$ in the photoproduction of $\omega$ mesons off the proton using CLAS at Jefferson Laboratory
• Photon beam asymmetry $\Sigma$ in the reaction $\vec{\gamma }p\to p\omega$ for $E_{\gamma }$ = 1.152 to 1.876 GeV