Journal article
Measurement of elasticρ 0 photoproduction at HERA
Zeitschrift für Physik. C, Particles and fields, Vol.69(1), pp.39-54
12/1995
DOI: 10.1007/BF02907384
Abstract
Elastic ρ 0 photoproduction has been measured using the ZEUS detector at HERA. Untagged photoproduction events from ep interactions were used to measure the reaction γp→ρ 0 p(ρ 0)→π +π-) at photon-proton centre-of-mass energies between 60 and 80 GeV and |t|<0.5 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The differential cross section dσ/d M ππ where M ππ is the invariant mass of the two pions, and the integrated cross section, σγp→ρ{variant}0ρ{variant}, are presented; the latter was measured to be 14.7±0.4 (stat.) ±2.4 (syst.)μb. The differential cross section dσ/dt has an approximately exponential shape; a fit of the type A t ′ exp(-b t ′ |t|+c t ′ t 2) yields a t-slope b t ′ =9.9±1.2 (stat.) ±1.4 (syst.) GeV-2. The results, when compared to low energy data, show a weak energy dependence of both σγp→ρ{variant}0p and of the t-slope. The ρ 0 is produced predominantly with transverse polarisation, demostrating that s-channel helicity conservation holds at these energies.
Details
- Title: Subtitle
- Measurement of elasticρ 0 photoproduction at HERA
- Creators
- ZEUS CollaborationJ. Repond (Contributor) - Argonne National LaboratoryU. Mallik (Contributor) - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Zeitschrift für Physik. C, Particles and fields, Vol.69(1), pp.39-54
- DOI
- 10.1007/BF02907384
- ISSN
- 0170-9739
- eISSN
- 1431-5858
- Language
- English
- Date published
- 12/1995
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627197102771
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