Unitarity constraints on meson electroproduction at backward angles

Abstract

At large virtuality $Q^2$, the coupling to the $\rho$ meson production channels provides us with a natural explanation of the surprisingly large cross section of the $\omega$, as well as the ${\pi }^{+}$, meson electroproduction recently measured at backward angles, without destroying the good agreement between the Regge pole model and the data at the real photon point. Together with elastic re-scattering of the outgoing meson it also provides us with a way to explain why the node, that appears at $u\sim -0.15$ GeV${}^2$ at the real photon point, disappears at moderate virtuality $Q^2$. Predictions are given for the electroproduction of the ${\pi }^0$ meson.

14 pages, 19 figures. Version in press in Phys. Rev. C. A few slips corrected. Figure 11 frame customized References 10 and 14 corrected

References in corpus (5)

• Cross sections for hard exclusive electroproduction of pi+ mesons on a hydrogen target
• Unitarity constraints on neutral pion electroproduction
• Deep exclusive ${\pi }^{+}$ electroproduction off the proton at CLAS
• QCD description of backward vector meson hard electroproduction
• Exclusive Meson Photo- and Electro-production, a Window on the Structure of Hadronic Matter

Cited by in corpus (4)

• Transition distribution amplitudes and hard exclusive reactions with baryon number transfer
• Progress and Opportunities in Backward angle (u-channel) Physics
• u-Channel Color Transparency Observables
• Backward-Angle ($u$-channel) Production at an Electron-Ion Collider