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Elsevier, Physics Letters B, 4(356), p. 601-616, 1995

DOI: 10.1016/0370-2693(95)00879-p

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Exclusive $ϱ^{0}$ production in deep inelastic electron-proton scattering at HERA

Journal article published in 1995 by M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The exclusive production of ϱ0 mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have been measured in the range 7 < Q2 < 25 GeV2 for λ∗p centre of mass (c.m.) energies 40 to 130 GeV. The λ∗p → ϱ0p cross section exhibits a Q−(4.2±0.8−0.5+1.4) dependence and both longitudinally and transversely polarised ϱ0's are observed. The λ∗p → ϱ0p cross section rises strongly with increasing c.m. energy, when compared with NMC data at lower energy, which cannot be explained by production through soft pomeron exchange. The data are compared with perturbative QCD calculations where the rise in the cross section reflects the increase in the gluon density at low x.