Journal article
Measurement of the spin-density matrix elements in exclusive electroproduction of $ho^0$ mesons at HERA
The European physical journal. C, Particles and fields, Vol.12(3), pp.393-410
02/2000
DOI: 10.1007/s100529900246
Abstract
Exclusive electroproduction of ρ0 mesons has been measured using the ZEUS detector at HERA in two Q2 ranges, 0.25 < Q2 < 0.85 GeV2 and 3 < Q2 < 30 GeV2. The low-Q2 data span the range 20 < W < 90 GeV; the high-Q2 data cover the 40 < W < 120 GeV interval. Both samples extend up to four-momentum transfers of |t| = 0.6 GeV2. The distribution in the azimuthal angle between the positron scattering plane and the ρ0 production plane shows a small but significant violation of s-channel helicity conservation, corresponding to the production of longitudinally polarised (i.e. helicity zero) ρ0 mesons from transverse photons. Measurements of the 15 combinations of spin-density matrix elements which completely define the angular distributions are presented and discussed.
Details
- Title: Subtitle
- Measurement of the spin-density matrix elements in exclusive electroproduction of $ho^0$ mesons at HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor) - Physics and AstronomyU Mallik (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- The European physical journal. C, Particles and fields, Vol.12(3), pp.393-410
- DOI
- 10.1007/s100529900246
- ISSN
- 1434-6044
- eISSN
- 1434-6052
- Language
- English
- Date published
- 02/2000
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627306702771
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