Transverse Target-Spin Asymmetry of Exclusive $\rho^0$ Meson Production on Proton at HERMES
Armine Rostomyan, Jeroen Dreschler (on behalf of the HERMES, collaboration)
TL;DR
This paper reports preliminary measurements of the azimuthal single-spin asymmetry in exclusive rho0 meson production on a transversely polarized proton target, providing insights into the nucleon's angular momentum structure within the GPD framework.
Contribution
It presents the first measurement of transverse target-spin asymmetry for exclusive rho0 meson production at HERMES, linking experimental data to GPD-based theoretical models.
Findings
Asymmetry measurements obtained for rho0 mesons.
Comparison with GPD-based theoretical predictions.
Insights into quark and gluon angular momentum contributions.
Abstract
Preliminary measurements are reported on the azimuthal single-spin asymmetry of exclusive rho0 mesons for a transversely polarized hydrogen target at HERMES using the 27.6 GeV HERA positron beam. Within the generalized parton distribution (GPD) formalism, this asymmetry is sensitive to the total angular momentum of quarks and gluons in the nucleon. Since the GPD formalism is only valid for mesons produced by longitudinal photons, the transverse target-spin asymmetry of longitudinal rho0 mesons is extracted assuming s-channel helicity conservation and compared to theoretical calculations.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Distributed and Parallel Computing Systems · Computational Physics and Python Applications