Epj Manuscript No. Exclusive Leptoproduction of 0 Mesons from Hydrogen at Intermediate Virtual Photon Energies

Abstract

Measurements of the cross section for exclusive virtual-photoproduction of 0 mesons from hydrogen are reported. The data were collected by the HERMES experiment using 27.5 GeV positrons incident on a hydrogen gas target in the HERA storage ring. The invariant mass W of the photon-nucleon system ranges from 4.0 to 6.0 GeV, while the negative squared four-momentum Q 2 of the virtual photon varies from 0.7 to 5.0 GeV 2. The present data together with most of the previous data at W > 4 GeV are well described by a model that infers the W-dependence of the cross section from the dependence on the Bjorken scaling variable x of the unpolarized structure function for deep-inelastic scattering. In addition, a model calculation based on OO-Forward Parton Distributions gives a fairly good account of the longitudinal component of the 0 production cross section for Q 2 > 2 GeV 2. 2

Cite this paper

@inproceedings{Airapetian2000EpjMN, title={Epj Manuscript No. Exclusive Leptoproduction of 0 Mesons from Hydrogen at Intermediate Virtual Photon Energies}, author={A . Airapetian and N . Z . Akopov and I. Akushevich and M . J . Amarian and J . R . Arrington and E . C . Aschenauer and Harut Avakian and R . M . Avakian and A . Avetissian and E . Avetissian and Philip Bailey and B. Bains and Christian Baumgarten and Moritz Beckmann and S. Belostotski and S . Bernreuther and Roberto De Leo and Lorenzo De Nardo and Elisabetta De Sanctis and D. De Schepper and Franco Garibaldi and Erika Garutti and Gavril Gavrilov and Rolf Kaiser and J. Kanesaka and E . R . Kinney and Alexandre V Kisselev and Paul R Kitching and Hiroyuki Kobayashi and Nicolas Koch and K. Konigsmann and Machiel Kolstein and Hauke Kolster and V . A . Korotkov and E . Kotik and Kenji Suetsugu and Marc Sutter and H. Tallini and V . V . Vikhrov and Manuella G. Vincter and J. Carolina Visser and Eugen Volk and Christine Weiskopf and Jozef Wendland and Juergen Wilbert and T. E. Wise and Kevin R Woller and Shota Yoneyama}, year={2000} }