Threshold Pion Electroproduction at Large Momentum Transfers

Abstract

We consider pion electroproduction close to threshold for $Q^2$ in the region 1-10 GeV${}^2$ on a nucleon target. The momentum transfer dependence of the S-wave multipoles at threshold, $E_{0+}$ and $L_{0+}$, is calculated in the chiral limit using light-cone sum rules. Predictions for the cross sections in the threshold region are given taking into account P-wave contributions that, as we argue, are model independent to a large extent. The results are compared with the SLAC E136 data on the structure function $F_2(W,Q^2)$ in the threshold region.

18 pages, 11 figures

References in corpus (14)

• Chiral Dynamics in Nucleons and Nuclei
• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Unitary Isobar Model - MAID2007
• QCD Constrains on the Shape of Polarized Quark and Gluon Distributions
• Analysis of Pion Photoproduction Data
• Nucleon Form Factors in QCD
• Light-Cone Sum Rules for the Nucleon Form Factors
• New empirical fits to the proton electromagnetic form factors
• Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions
• Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
• Hard exclusive electroproduction of a pion in the backward region
• Soft pion theorem for hard near threshold pion production
• Deep Inelastic Pion Electroproduction at Threshold

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• The Nucleon Distribution Amplitudes and their application to nucleon form factors and the $N\to \Delta$ transition at intermediate values of $Q^2$
• Electroproduction of the $N^{\ast }(1535)$ nucleon resonance in QCD
• A consistent model for πN transition distribution amplitudes and backward pion electroproduction
• πN transition distribution amplitudes: Their symmetries and constraints from chiral dynamics
• Parton content of the nucleon from distribution amplitudes and transition distribution amplitudes
• A spectral representation for baryon to meson transition distribution amplitudes
• Axial form factor of the nucleon at large momentum transfers
• Exclusive ${\mathbf{\pi }}^0\mathbf{p}$ electroproduction off protons in the resonance region at photon virtualities 0.4~GeV${}^2$ $\le {\mathbf{Q}}^2\le 1$~GeV${}^2$
• Measurement of the generalized form factors near threshold via ${\gamma }^{\ast }p\to n{\pi }^{+}$ at high $Q^2$
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Near Threshold Neutral Pion Electroproduction at High Momentum Transfers and Generalized Form Factors