Exclusive $\eta$ electroproduction at $W>2$ GeV with CLAS and transversity generalized parton distributions

Abstract

The cross section of the exclusive $\eta$ electroproduction reaction $ep\to e^{\prime }{p}^{\prime }\eta$ was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections $d^4\sigma /dtd{Q}^{2}d{x}_{B}d{\varphi }_{\eta }$ and structure functions ${\sigma }_U={\sigma }_T+\epsilon {\sigma }_L,{\sigma }_{TT}$ and ${\sigma }_{LT}$, as functions of $t$ were obtained over a wide range of $Q^2$ and $x_B$. The $\eta$ structure functions are compared with those previously measured for ${\pi }^0$ at the same kinematics. At low $t$, both ${\pi }^0$ and $\eta$ are described reasonably well by generalized parton distributions (GPDs) in which chiral-odd transversity GPDs are dominant. The ${\pi }^0$ and $\eta$ data, when taken together, can facilitate the flavor decomposition of the transversity GPDs.

16 pages, 16 figures

References in corpus (4)

• Transverse spin structure of the nucleon from lattice QCD simulations
• Nucleon Tensor Charge from Exclusive ${\pi }^o$ Electroproduction
• Measurement of Exclusive ${\pi }^0$ Electroproduction Structure Functions and their Relationship to Transversity GPDs
• Rosenbluth separation of the ${\pi }^0$ electroproduction cross section

Cited by in corpus (2)

• Initial-state temperature of light meson emission source from squared momentum transfer spectra in high-energy collisions
• Study of transversity GPDs from pseudoscalar mesons production at EIC of China