Exclusive ${\pi }^0$ electroproduction at $W>2$ GeV with CLAS

Abstract

Exclusive neutral-pion electroproduction ($ep\to e^{\prime }{p}^{\prime }{\pi }^0$) was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections $d^4\sigma /dtd{Q}^{2}d{x}_{B}d{\varphi }_{\pi }$ and structure functions ${\sigma }_T+\epsilon {\sigma }_L,{\sigma }_{TT}$ and ${\sigma }_{LT}$ as functions of $t$ were obtained over a wide range of $Q^2$ and $x_B$. The data are compared with Regge and handbag theoretical calculations. Analyses in both frameworks find that a large dominance of transverse processes is necessary to explain the experimental results. For the Regge analysis it is found that the inclusion of vector meson rescattering processes is necessary to bring the magnitude of the calculated and measured structure functions into rough agreement. In the handbag framework, there are two independent calculations, both of which appear to roughly explain the magnitude of the structure functions in terms of transversity generalized parton distributions.

arXiv comment28 pages, 25 figures, Submitted to Phys. Rev. C

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• Lepton-Nucleus Cross Section Measurements for DUNE with the LDMX Detector
• Exclusive $\eta$ electroproduction at $W>2$ GeV with CLAS and transversity generalized parton distributions
• Extraction of beam-spin asymmetries from the hard exclusive ${\pi }^{+}$ channel off protons in a wide range of kinematics
• Target and Double Spin Asymmetries of Deeply Virtual ${\pi }^0$ Production with a Longitudinally Polarized Proton Target and CLAS
• 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${}^2$
• Rosenbluth separation of the ${\pi }^0$ Electroproduction Cross Section off the Neutron
• Deep exclusive electroproduction of ${\pi }^0$ at high $Q^2$ in the quark valence regime
• Virtuality and Transverse Momentum Dependence of Pion Distribution Amplitude
• Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS
• Spin-flavor structure of chiral-odd GPDs in the large-N_c limit
• The GPD H-tilde and spin correlations in wide-angle Compton scattering
• Initial-state temperature of light meson emission source from squared momentum transfer spectra in high-energy collisions
• Deeply Virtual Pseudoscalar Meson Production at Jefferson Lab and Transversity GPDs
• Exclusive ${\pi }^0$ production at EIC of China within handbag approach
• Study of transversity GPDs from pseudoscalar mesons production at EIC of China
• Hard exclusive processes involving kaons
• Twist-3 contribution to deeply virtual electroproduction of pions
• Isovector and isoscalar tensor form factors of $N(1535)\to N$ transition in light-cone QCD
• The exclusive Drell-Yan process and deeply virtual pion production
• Experimental access to Transition Distribution Amplitudes with the PANDA experiment at FAIR
• Chiral-odd GPDs in large-N_c QCD
• A hybrid model for multi-particle production and multi-fragment emission in electron-nucleus collisions at the forthcoming Electron-Ion Collider