Features of $\omega$ photoproduction off proton target at backward angles : Role of nucleon Reggeon in $u$-channel with parton contributions

Abstract

Backward photoproduction of $\omega$ off a proton target is investigated in a Reggeized model where the $u$-channel nucleon Reggeon is constructed from the nucleon Born terms in a gauge invariant way. The $t$-channel meson exchanges are considered as a background. While the $N_{\alpha }$ trajectory of the nucleon Reggeon reproduces the overall shape of NINA data measured at the Daresbury Laboratory in the range of $u$-channel momentum transfer squared $-1.7<u<0.02$ GeV${}^2$ and energies at $E_{\gamma }=2.8$, 3.5 and 4.7 GeV, a possibility of parton contributions is searched for through the nucleon isoscalar form factor which is parameterized in terms of parton distributions at the $\omega NN$ vertex. Detailed analysis is presented for NINA data to understand the reaction mechanism that could fill up the deep dip from the nucleon Reggeon at momentum squared $u=-0.15$ GeV${}^2$. The angle dependence of differential cross sections at the NINA energies above are reproduced in the overall range of $u$ including the CLAS data at forward angles in addition. The energy dependence of the differential cross section is investigated based on the NINA data and the recent LEPS data. A feature of the present approach that implicates parton contributions via nucleon form factor is illustrated in the total and differential cross sections provided by GRAAL and CB-ELSA Collaborations.

arXiv comment8 pages, 9 figures, 1 table

References in corpus (18)

• Nucleon Electromagnetic Form Factors
• Nucleon Form Factors from Generalized Parton Distributions
• Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2
• Vector meson electroproduction at small Bjorken-x and generalized parton distributions
• Nucleon form factors, generalized parton distributions and quark angular momentum
• Photoproduction of Vector Mesons at Large Transfer
• DRAFT: Photoproduction of the ${\rho }^0$ meson on the proton at large momentum transfer
• Cross Section Measurement of Charged Pion Photoproduction from Hydrogen and Deuterium
• Photoproduction of the $\omega$ meson on the proton at large momentum transfer
• Photoproduction of ω Mesons off the Proton
• Deep exclusive charged $\pi$ electroproduction above the resonance region
• Signatures of the handbag mechanism in wide-angle photoproduction of pseudoscalar mesons
• QCD description of backward vector meson hard electroproduction
• Role of $\sigma$ exchange in the $\gamma p\to \varphi p$ process and scaling with the $f_1$ axial vector meson from a Reggeized model
• Backward-angle photoproduction of $\omega$ and ${\eta }^{\prime }$ mesons from protons at $E_{\gamma }=1.5-3.0$ GeV
• Pion and proton form factors in the Regge description of electroproduction $p(e,e^{\prime }{\pi }^{+})n$
• Role of $\omega$-meson exchange in scaling of the $\gamma p\to {\pi }^{0}p$ process from a Regge-type model with resonances
• Regge phenomenology of photoproduction of ${\pi }^{-}{\Delta }^{++}$ and scaling with saturation of trajectory

Cited by in corpus (2)

• Transition distribution amplitudes and hard exclusive reactions with baryon number transfer
• Progress and Opportunities in Backward angle (u-channel) Physics