$\omega N$ scattering length from $\omega$ photoproduction on the proton near the threshold

Abstract

Photoproduction of the $\omega$ meson on the proton has been experimentally studied near the threshold. The total cross sections are determined at incident energies ranging from 1.09 to 1.15 GeV. The 1/2 and 3/2 spin-averaged scattering length $a_{\omega p}$ and effective range $r_{\omega p}$ between the $\omega$ meson and proton are estimated from the shape of the total cross section as a function of the incident photon energy: $a_{\omega p}=\left(-0.97_{-0.16_{\mathrm{stat}}}^{+0.16_{\mathrm{stat}}}{}_{-0.00_{\mathrm{syst}}}^{+0.03_{\mathrm{syst}}}\right)+i\left(0.07_{-0.14_{\mathrm{stat}}}^{+0.15_{\mathrm{stat}}}{}_{-0.09_{\mathrm{syst}}}^{+0.17_{\mathrm{syst}}}\right)$ fm and $r_{\omega p}=\left(+2.78_{-0.54_{\mathrm{stat}}}^{+0.68_{\mathrm{stat}}}{}_{-0.13_{\mathrm{syst}}}^{+0.11_{\mathrm{syst}}}\right)+i\left(-0.01_{-0.50_{\mathrm{stat}}}^{+0.46_{\mathrm{stat}}}{}_{-0.00_{\mathrm{syst}}}^{+0.07_{\mathrm{syst}}}\right)$ fm, resulting in a repulsive force. The real and imaginary parts for $a_{\omega p}$ and $r_{\omega p}$ are determined separately for the first time. A small $P$-wave contribution does not affect the obtained values.

arXiv comment6 pages, 4 figures

References in corpus (19)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Relativistic Equation of State of Nuclear Matter for Supernova and Neutron Star
• Experimental Signature of Medium Modifications for rho and omega Mesons in the 12 GeV p + A Reactions
• Coupled-channel analysis of the $\omega$-meson production in $\pi N$ and $\gamma N$ reactions for c.m. energies up to 2 GeV
• Double pion photoproduction on nucleon and deuteron
• Observation of $\rho /\omega$ Meson Modification in Nuclear Matter
• Nuclear bound states of $\omega$ mesons
• Differential cross sections and spin density matrix elements for the reaction gamma p -> p omega
• Photoproduction of the $\omega$ meson off the proton near threshold
• QCD sum rules for ρ, ω, ϕmeson-nucleon scattering lengths and the mass shifts in nuclear medium
• Partial wave analysis of the reaction gamma p -> p omega$ and the search for nucleon resonances
• Photoproduction of ω Mesons off the Proton
• Scattering of vector mesons off nucleons
• First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV
• Non-strange Dibaryon Resonances Observed in the $\gamma d\to {\pi }^0{\pi }^{0}d$ Reaction
• Structure of Lambda(1405) and threshold behavior of piSigma scattering
• Experimental constraints on the $\omega$-nucleus real potential
• Experimental approaches for determining in-medium properties of hadrons from photo-nuclear reactions
• Dynamical coupled channel calculation of pion and omega meson production

Cited by in corpus (6)

• The reaction $\pi N\to \omega N$ in a dynamical coupled-channel approach
• Resonance-like structure near the $\eta d$ threshold in the $\gamma d${$\to$}${\pi }^0\eta d$ reaction
• Extraction of $\omega$n, $\omega$p and $\varphi$N scattering lengths from $\omega$ and $\varphi$ differential photoproduction cross sections on the deuterium target
• Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV
• Vector meson-nucleon scattering length $|{\alpha }_{VN}|$ and trace anomalous energy contribution to the nucleon mass $T_A$
• First Extraction of the $\varphi$-${}^4\mathrm{He}$ scattering length from near-threshold $\varphi$ photoproduction on helium-4