Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 3-29 |
| Number of pages | 27 |
| Journal | Nuclear Physics B |
| Volume | 463 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 18 Mar 1996 |
Keywords
- Decay angular distribution
- Rho meson
- Vector meson