Photoproduction of π+π-π0 on hydrogen with linearly polarized photons of energy 20-70 GeV
Creators
- Lasalle, J.C.1
- Patrick, G.N.1
- Storr, K.M.1
- Atkinson, M.
- Axon, T.J.
- Barberis, D.
- Brodbeck, T.J.
- Brookes, G.R.
- Bunn, J.J.
- Bussey, P.J.
- Clegg, A.B.
- Dainton, J.B.
- Davenport, M.
- Dickinson, B.
- Dieckmann, B.
- Donnachie, A.
- Ellison, R.J.
- Flower, P.
- Flynn, P.J.
- Galbraith, W.
- Heinloth, K.
- Henderson, R.C.W.
- Hughes-Jones, R.E.
- Hutton, J.S.
- Ibbotson, M.
- Jakob, H.P.
- Jung, M.
- Kemp, M.A.R.
- Kumar, B.R.
- Laberrigue, J.
- Lafferty, G.D.
- Lane, J.B.
- Levy, J.M.
- Liebenau, V.
- McClatchey, R.H.
- Mercer, D.
- Morris, J.A.G.
- Morris, J.V.
- Newton, D.
- Paterson, C.
- Paul, E.
- Raine, C.
- Reidenbach, M.
- Rotscheidt, H.
- Schloesser, A.
- Sharp, P.H.
- Skillicorn, I.O.
- Smith, K.M.
- Thompson, R.J.
- Vaissiere, C. de la
- Waite, A.P.
- Worsell, M.F.
- Yiou, T.P.
- Omega Photon Collaboration
- 1. European Organization for Nuclear Research, Geneva (Switzerland)
Description
Results on photoproduction of π+π-π0 in the photon energy range 20-70 GeV are presented. For the ω meson, the production cross-section is found to be 1010 +- 15 (statistical) +- 290 (systematic) nb and is constant over the incident photon energy range. Spin-density matrix elements are evaluated for ω meson production. The PHI meson is observed with a total photoproduction cross section (corrected for branching ratio to π+π-π0) of 610 +- 35 +- 170 nb. A third resonance, at 1.67 GeV, is seen in the mass spectrum and its interpretation is discussed. The production of a braod π+π-π0 continuum, mainly via rhoπ, and peaking at 1.2 GeV, contributes with a cross section of about 2.5 μb. The spin-parity content is analysed by the moments of the π+π-π0 decay angular distribution in the helicity frame and by maximum likelihood fits to the π+π-π0 Dalitz plot. It is found that production of Jsup(P) = 1- states accounts for less than half of the total mass spectrum above 900 MeV. There is a broad enhancement in the 1+ wave around 1.15 GeV indicating photoproduction of the H(1190) meson. (orig.)
Additional details
Publishing Information
- Journal Title
- Nucl. Phys., B
- Journal Volume
- 231
- Journal Issue
- 1
- Series
- CODEN: NUPBB.;Nucl. Phys., B.
- Journal Page Range
- 15-39
- ISSN
- 0550-3213
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- Netherlands
- INIS RN
- 15026722
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANGULAR DISTRIBUTION; BRANCHING RATIO; DENSITY MATRIX; DIFFERENTIAL CROSS SECTIONS; EFFECTIVE MASS; ENERGY DEPENDENCE; EXPERIMENTAL DATA; GEV RANGE 10-100; HADRONIC PARTICLE DECAY; INTEGRAL CROSS SECTIONS; MASS SPECTRA; MATRIX ELEMENTS; OMEGA-784 RESONANCES; P STATES; PAIR PRODUCTION; PARITY; PARTICLE WIDTHS; PHI-1019 RESONANCES; PHOTON-PROTON INTERACTIONS; PHOTOPRODUCTION; PIONS MINUS; PIONS NEUTRAL; PIONS PLUS; POLARIZED BEAMS; PROTONS; REST MASS; S STATES; SPIN; VECTOR MESONS
- Descriptors DEC
- ANGULAR MOMENTUM; ANTIMATTER; ANTIMESONS; ANTIPARTICLES; BARYONS; BASIC INTERACTIONS; BEAMS; BOSONS; CATIONS; CHARGED PARTICLES; CROSS SECTIONS; DATA; DECAY; DISTRIBUTION; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; FERMIONS; GEV RANGE; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; INFORMATION; INTERACTIONS; IONS; MASS; MATRICES; MATTER; MESON RESONANCES; MESONS; NUCLEONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; PIONS; PSEUDOSCALAR ANTIMESONS; PSEUDOSCALAR MESONS; RESONANCE PARTICLES; SPECTRA
Optional Information
- Collaborations
- Omega Photon Collaboration.