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Exclusive production of quarkonia as a probe of the generalized parton distribution for gluons

John Koempel¹, Peter Kroll^2,3, Andreas Metz¹, and Jian Zhou³

¹Department of Physics, Barton Hall, Temple University, Philadelphia, Pennsylvania 19122, USA
²Fachbereich Physik, Universität Wuppertal, 42097 Wuppertal, Germany
³Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

Phys. Rev. D 85, 051502(R) – Published 16 March, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.051502

Abstract

Exclusive quarkonium photo- and electro-production off the nucleon is studied in the framework of generalized parton distributions (GPDs). The short-distance part of the process is treated at leading order in perturbative Quantum Chromodynamics. The main focus is on the GPD $E$ for gluons. On the basis of different models for $E^{g}$ we estimate the transverse target spin asymmetry for typical kinematics of a future Electron Ion Collider. We also explore the potential of measuring the polarization of the recoil nucleon.

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