Comparison of photon and hadron induced production of ρ0 mesons in the energy range of 65 to 175 GeV

Autor: B. Dickinson, D. Joseph, P. J. Ottewell, R. Oedingen, C. Gapp, S. Danagulian, P. S. Flower, C. Paterson, R. E. Hughes-Jones, R. J. Ellison, S. Holzkamp, Neil A. Thacker, N. R. Keemer, S. D. Kolya, A. T. Doyle, A. B. Clegg, S. Danaher, Klaus Heinloth, M. Davenport, C. McManus, L. F. Thompson, G. W. Wilson, T. Charity, B. Diekmann, R. C. W. Henderson, D. Barberis, M. Atkinson, J. Kingler, G. Körsgen, R. P. Hofmann, A. G. Oganesian, P. Coyle, D. Newton, R. J. Apsimon, Hugh McCann, A. O'Connor, J. V. Morris, E. Paul, P. Sharp, M. T. Hickman, S. Soeldner-Rembold, F. Gebert, W. Galbraith, K. C. Hoeger, H. Rotscheidt, R. J. Thompson, J. Eades, A. S. Weigend, P. I. Galumian, L. S. Bagdasarian, J. Waterhouse, J. A. G. Morris, A. Holzkamp, N. H. Brook, M. Baake, A. Donnachie, M. Ibbotson, T. J. Brodbeck, H.-P. Jakob, D. Mercer, G. Hallewell, F. Fiedler, D. Raid, R. McClatchey, G. D. Lafferty, J. M. Foster
Rok vydání: 1992
Předmět:
Zdroj: Zeitschrift für Physik C Particles and Fields. 53:581-594
ISSN: 1434-6052
0170-9739
Popis: The inclusive production of ρ0 mesons was measured in γp andh ± p collisions at beam energies of 65 GeV≦E γ≦175 GeV andE h =80, 140 GeV, respectively, whereh is π orK. Cross sections were determined for all beams and energies as functions ofx F (−0.1≦x F≦1.0),p T (0≦p T≦3.5 GeV/c) and the polar decay angle of the ρ0 by fitting the ρ0 signal in π+π- mass distributions. The ρ0 line shape is found to be distorted from a pure Breit-Wigner distribution throughout most of thex F−p T plane for both photon and hadron beams and a simple explanation is suggested. Throughout the paper emphasis is put on the comparison of photon and hadron beam data. The comparison of cross sections of γp andhp data provides a measure of the Vector Meson Dominance factor throughout thex F−p T range of the ρ0. The ρ0 production at lowp T can be described for both photon and hadron beams by a triple regge model at largex F. Similarly central production is well described by the quark-antiquark fusion model. At largep T there is an excess of ρ0 photoproduction which is consistent with the expected onset of pointlike photon interactions.
Databáze: OpenAIRE
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