Résumé
The cross section for the elastic photoproduction of ρ0 mesons (γp → ρ0p) has been measured with the H1 detector at HERA for two average photon-proton centre-of-mass energies of 55 and 187 GeV. The lower energy point was measured by observing directly the ρ0 decay giving a cross section of 9.1 ± 0.9 (stat.) ± 2.5 (syst.) μb. The logarithmic slope parameter of the differential cross section, dσ/dt, is found to be 10.9 ± 2.4 (stat.) ± 1.1 (syst.) GeV-2. The ρ0 decay polar angular distribution is found to be consistent with s-channel helicity conservation. The higher energy cross section was determined from analysis of the lower part of the hadronic invariant mass spectrum of diffractive photoproduction and found to be 13.6 ± 0.8 (stat.) ± 2.4 (syst.) μb.
| langue originale | Anglais |
|---|---|
| Pages (de - à) | 3-29 |
| Nombre de pages | 27 |
| journal | Nuclear Physics B |
| Volume | 463 |
| Numéro de publication | 1 |
| Les DOIs | |
| état | Publié - 18 mars 1996 |
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