Rosenbluth separation of the ${\pi }^0$ Electroproduction Cross Section off the Neutron

Abstract

We report the first longitudinal/transverse separation of the deeply virtual exclusive ${\pi }^0$ electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions $d{\sigma }_L/dt$, $d{\sigma }_T/dt$, $d{\sigma }_{LT}/dt$ and $d{\sigma }_{TT}/dt$ are extracted as a function of the momentum transfer to the recoil system at $Q^2$=1.75 GeV${}^2$ and $x_B$=0.36. The $ed\to ed{\pi }^0$ cross sections are found compatible with the small values expected from theoretical models. The $en\to en{\pi }^0$ cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity GPDs of the nucleon. By combining these results with previous measurements of ${\pi }^0$ electroproduction off the proton, we present a flavor decomposition of the $u$ and $d$ quark contributions to the cross section.

arXiv comment6 pages, 6 figures, Submitted to Phys. Rev. Lett

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Cited by in corpus (9)

• Insights into the Emergence of Mass from Studies of Pion and Kaon Structure
• Transversity generalized parton distributions for the deuteron
• Measurement of the cross section for hard exclusive ${\pi }^0$ leptoproduction
• Extraction of beam-spin asymmetries from the hard exclusive ${\pi }^{+}$ channel off protons in a wide range of kinematics
• Deep exclusive electroproduction of ${\pi }^0$ at high $Q^2$ in the quark valence regime
• Spatial densities of momentum and forces in spin-one hadrons
• Twist-3 contribution to deeply virtual electroproduction of pions
• Deeply virtual meson production on neutrons
• Deeply virtual Compton scattering off the neutron