Deep exclusive electroproduction of ${\pi }^0$ at high $Q^2$ in the quark valence regime

Abstract

We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$ (3.1 to 8.4 GeV${}^2$) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions $d{\sigma }_L/dt+\epsilon d{\sigma }_T/dt$, $d{\sigma }_{TT}/dt$, $d{\sigma }_{LT}/dt$ and $d{\sigma }_{L{T}^{\prime }}/dt$ are extracted as a function of the proton momentum transfer $t-t_{min}$. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross-section throughout this kinematic range. The data are well described by calculations based on transversity Generalized Parton Distributions coupled to a helicity flip Distribution Amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.

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Cited by in corpus (5)

• 50 Years of Quantum Chromodynamics
• Deeply virtual Compton scattering cross section at high Bjorken $x_B$
• An introductory lecture on Generalised Parton Distributions
• u-Channel Color Transparency Observables
• Twist-3 contribution to deeply virtual electroproduction of pions