Unitarity constraints on neutral pion electroproduction

Abstract

At large virtuality $Q^2$, the coupling to the vector meson production channels provides us with a natural explanation of the surprisingly large cross section of the neutral pion electroproduction recently measured at Jefferson Laboratory, without destroying the good agreement between the Regge pole model and the data at the real photon point. Elastic rescattering of the ${\pi }^0$ provides us with a way to explain why the node, that appears at $t\sim -0.5$ GeV${}^2$ at the real photon point, disappears as soon as $Q^2$ differs from zero.

7 pages; 12 figures Figures 1, 2, 10, 11, 12 updated. Axial-tensor coupling, instead of axial-vector coupling, at the b1NN vertex

References in corpus (9)

• Charged pion form factor between Q^2=0.60 and 2.45 GeV^2. II. Determination of, and results for, the pion form factor
• Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target
• Photoproduction of Vector Mesons at Large Transfer
• Deeply virtual and exclusive electroproduction of omega mesons
• The space-time structure of hard scattering processes
• Beam spin asymmetry in deep and exclusive pi0 electroproduction
• The Primakoff effect on a proton target
• Rescattering in Meson Photoproduction off Few Body Systems
• Unitarity constraints on charged pion photoproduction at large p_perp

Cited by in corpus (16)

• Measurement of Exclusive ${\pi }^0$ Electroproduction Structure Functions and their Relationship to Transversity GPDs
• Measurement of the beam asymmetry $\Sigma$ for ${\pi }^0$ and $\eta$ photoproduction on the proton at $E_{\gamma }=9$ GeV
• Exclusive ${\pi }^0$ electroproduction at $W>2$ GeV with CLAS
• Electroweak single-pion production off the nucleon: from threshold to high invariant masses
• Exclusive Neutral Pion Electroproduction in the Deeply Virtual Regime
• Beam Asymmetry $\mathbf{\Sigma }$ for the Photoproduction of $\eta$ and ${\eta }^{\prime }$ Mesons at ${\mathbf{E}}_{\gamma }=8.8$GeV
• Progress and Opportunities in Backward angle (u-channel) Physics
• Exclusive photoproduction of ${\pi }^0$ up to large values of Mandelstam variables $s,t$ and $u$ with CLAS
• Exclusive Meson Photo- and Electro-production, a Window on the Structure of Hadronic Matter
• Unitarity constraints on meson electroproduction at backward angles
• Features of forward $\pi N$ scattering from a Reggeized model
• Nondiffractive feature of $\gamma N\to {\rho }^{\pm }N$ with $\rho$-meson electromagnetic multipole moments
• Role of scalar mesons in the beam asymmetry of $p\bar{p}$ and $\Lambda \bar{\Lambda }$ photoproduction at JLab
• Pseudoscalar and Scalar Meson Photoproduction Interpreted by Regge Phenomenology
• Backward-angle Exclusive pi0 Production above the Resonance Region
• Reggeized model for $\gamma p\to {\rho }^{-}{\Delta }^{++}(1232)$ photoproduction