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Accessing the gluon GTMD boldsymbol{F_(1,4)} in exclusive boldsymbol{π⁰} production in boldsymbol{ep} collisions
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Accessing the gluon GTMD boldsymbol{F_(1,4)} in exclusive boldsymbol{π⁰} production in boldsymbol{ep} collisions
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We demonstrate that the longitudinal single target-spin asymmetry in exclusive $\pi^0$ production in $ep$ collisions can give access to the imaginary part of the gluon generalized transverse momentum distribution (GTMD) $F_{1,4}$. Such a longitudinal spin asymmetry that results from the Coulomb-nuclear interference effect, leads to a characteristic azimuthal angular correlation of $\sin 2\phi$, where $\phi$ is the azimuthal angle between the scattered lepton transverse momentum and the recoiled proton's transverse momentum. We also present a numerical estimate of the asymmetry for the kinematics accessible at EIC and EicC.
Forward citations
Cited by 4 Pith papers
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