Exclusive high-$Q^2$ electroproduction: light-cone wave functions and electromagnetic form factors of mesons,

Abstract

We apply the light-cone technique to electroproduction reaction $ep\to e{\pi }^{+}n$ long considered as a means of measuring the electromagnetic form factor of the pion. We show that the interpretation of the long-standing puzzle of large transverse cross section (${\sigma }_T$) in terms of the ${\gamma }^{\ast }\rho \to \pi$ transition on the $\rho$ mesons in the light-cone proton is possible, but requires quite a slow decrease of the $F_{ρπ}(\q2)$ form factor. This interpretation can be tested in the related $ep\to e{\pi }^{0}p$ reaction. Corrections which are due to the final-state meson-baryon interactions (FSI) are evaluated and are shown to amount to a $25\%$ effect at moderately large $\q2$. Vanishing FSI with increasing $Q^2$ - the color transparency phenomenon - is shown to be very strong.

References in corpus (2)

• Theoretical Interpretation of the NE18 Experiment on Nuclear Transparency in A(e,e'p) Scattering
• The Onset of Color Transparency in $(e,e^{\prime }p)$ Reactions on Nuclei

Cited by in corpus (6)

• Quasi-elastic knockout of pions and kaons from nucleons by high-energy electrons and quark microscopy of "soft" meson degrees of freedom in the nucleon
• Role of the rho meson in the description of pion electroproduction experiments at JLab
• Azimuthal asymmetry as a new handle on ${\sigma }_L/{\sigma }_T$ in diffractive DIS
• Quark model description of quasi-elastic pion knockout from the proton at JLAB
• Microscopics of meson degrees of freedom in nucleons and mesons in nuclei - what can be seen in the process of quasielastic knockout of mesons by high-energy electrons
• Pionic Degrees of Freedom in Atomic Nuclei and Quasielastic Knockout of Pions by High-Energy Electrons