Exclusive electroproduction of $\rho^0$ and $J/\psi$ mesons at HERA

ZEUS Collaboration:     J. Breitweg - et al.

doi:doi:10.1007/s100529901051

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2018 Impact factor 4.843

Particles and Fields

Eur. Phys. J. C 6, 603-627
DOI 10.1007/s100529901051

Exclusive electroproduction of $\rho^0$ and $J/\psi$ mesons at HERA

ZEUS Collaboration

J. Breitweg - et al.

Argonne National Laboratory, Argonne, IL, USA

Received: 20 August 1998 / Published online: 14 January 1999

Abstract
Exclusive production of $\rho^0$ and $J/\psi$ mesons in e⁺p collisions has been studied with the ZEUS detector in the kinematic range 0.25 < Q² < 50 $\mathrm{{\rm Ge}\kern-1.pt{\rm V}}^2$ , 20 < W < 167 GeV for the $\rho^0$ data and 2 < Q² < 40 $\mathrm{{\rm Ge}\kern-1.pt{\rm V}}^2$ , 50 < W < 150 GeV for the $J/\psi$ data. Cross sections for exclusive $\rho^0$ and $J/\psi$ production have been measured as a function of Q², W and t. The spin-density matrix elements r⁰⁴₀₀, r¹_1-1 and Re $\:r^{5}_{10}$ have been determined for exclusive $\rho^0$ production as well as r⁰⁴₀₀ and r⁰⁴_1-1 for exclusive $J/\psi$ production. The results are discussed in the context of theoretical models invoking soft and hard phenomena.

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Exclusive electroproduction of and mesons at HERA

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Exclusive electroproduction of $\rho^0$ and $J/\psi$ mesons at HERA