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 \(0.25 < Q^2 < 50\) GeV\(^2\), \(20 < W < 167\) GeV for the \(\rho^0\) data and \(2 < Q^2 < 40\) GeV\(^2\), \(50 < W < 150\) GeV for the \(J/\psi\) data. Cross sections for exclusive \(\rho^0\) and \(J/\psi\) production have been measured as a function of \(Q^2\), W and t. The spin-density matrix elements \(r^{04}_{00}\), \(r^1_{1-1}\) and Re\(\:r^{5}_{10}\) have been determined for exclusive \(\rho^0\) production as well as \(r^{04}_{00}\) and \(r^{04}_{1-1}\) for exclusive \(J/\psi\) production. The results are discussed in the context of theoretical models invoking soft and hard phenomena.
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Received: 20 August 1998 / Published online: 14 January 1999
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ZEUS Collaboration., Breitweg et al., J. Exclusive electroproduction of \(\rho^0\) and \(J/\psi\) mesons at HERA. Eur. Phys. J. C 6, 603–627 (1999). https://doi.org/10.1007/s100529901051
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DOI: https://doi.org/10.1007/s100529901051