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Achterberg, O.; D'Agostini, G.; Apel, W.D.; Engler, J.; Fluegge, G.; Forstbauer, B.; Fries, D.C.; Fues, W.; Gamerdinger, K.; Henkes, T.; Hopp, G.; Krueger, M.; Kuester, H.; Mueller, H.; Randoll, H.; Schmidt, G.; Schneider, H.; Boer, W. de; Buschhorn, G.; Grindhammer, G.; Grosse-Wiesmann, P.; Gunderson, B.; Kiesling, C.; Kotthaus, R.; Kruse, U.; Lierl, H.; Lueers, D.; Oberlack, H.; Schacht, P.; Bonneaud, G.; Colas, P.; Cordier, A.; Davier, M.; Fournier, D.; Grivaz, J.F.; Haissinski, J.; Journe, V.; Laplanche, F.; Le Diberder, F.; Mallik, U.; Ros, E.; Veillet, J.J.; Behrend, H.J.; Fenner, H.; Schachter, M.J.; Schroeder, V.; Sindt, H.
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.); CELLO Collaboration1983
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.); CELLO Collaboration1983
AbstractAbstract
[en] We have determined the cross section for γγ -> π+π+π-π- in a way free of assumptions about the relative contributions from rho0rho0, rho02π and 4π (uncorrelated phase space). We find a sharp onset above threshold and a rather high cross section of about 200 nb around Wsub(γγ) = 1.5 GeV which consists to about 40% of rho0rho0 production with sizeable contributions from rho02π and 4π (P.S.). The total cross section as well as the rho0rho0 content fall rather fast at higher c.m. energies. Attempts to explain this behaviour in terms of production of known resonances are not successful so far. The angular distributions do not show any significant structure pointing to resonance formation in the 4π-system. Only the rho0-meson is observed in the moment analysis. The decay distributions of the rho0 for forward produced rhos are fairly consistent with helicity conservation of the produced rhos in accordance with the VDM picture. (orig.)
Primary Subject
Source
Sep 1983; 38 p
Record Type
Report
Literature Type
Numerical Data
Report Number
Country of publication
ANGULAR DISTRIBUTION, DENSITY MATRIX, EFFECTIVE MASS, ENERGY DEPENDENCE, EXPERIMENTAL DATA, GEV RANGE 01-10, HADRONIC PARTICLE DECAY, INTEGRAL CROSS SECTIONS, MASS SPECTRA, MATRIX ELEMENTS, PAIR PRODUCTION, PHOTON-PHOTON INTERACTIONS, PHOTOPRODUCTION, PIONS MINUS, PIONS PLUS, POLARIZED PRODUCTS, RHO-765 RESONANCES, SPIN ORIENTATION, TRANSVERSE MOMENTUM
ANTIMATTER, ANTIMESONS, ANTIPARTICLES, BASIC INTERACTIONS, BOSONS, CROSS SECTIONS, DATA, DECAY, DISTRIBUTION, ELECTROMAGNETIC INTERACTIONS, ELEMENTARY PARTICLES, ENERGY RANGE, GEV RANGE, HADRONS, INFORMATION, INTERACTIONS, LINEAR MOMENTUM, MASS, MATRICES, MATTER, MESON RESONANCES, MESONS, NUMERICAL DATA, ORIENTATION, PARTICLE DECAY, PARTICLE INTERACTIONS, PARTICLE PRODUCTION, PIONS, PSEUDOSCALAR ANTIMESONS, PSEUDOSCALAR MESONS, RESONANCE PARTICLES, SPECTRA
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