1. Measurement and analysis of the reaction $\gamma\gamma\to\pi^+3\pi^-$
- Author
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Pust, R., Olsson, J., Clarke, D., Dieckmann, A., Duerdoth, I. P., Eckerlin, Guenter, Elsen, E., Felst, R., Finch, A. J., Foster, F., Greenshaw, T., Hagemann, J., Allison, John, Haidt, D., Heintze, J., Heinzelmann, G., Hellenbrand, K. H., Hill, P., Hughes, G., Kado, H., Kawagoe, K., Kleinwort, C., Knies, G., Ambrus, K., Komamiya, S., Krehbiel, H., von Krogh, J., Kuhlen, M., Loebinger, F. K., Macbeth, A. A., Magnussen, N., Marshall, R., Meinke, R., Middleton, R. P., Barlow, Roger J., Murphy, P. G., Naroska, B., Nye, J. M., Ould-Saada, F., Pitzl, D., Ramcke, R., Rieseberg, H., Sato, A., Schmidt, D., Smolik, L., Bartel, W., Schneekloth, U., Skard, J. A. J., Spitzer, J., Steffen, P., Stephens, K., Takeshita, T., Wagner, A., Walker, I. W., Weber, G., Zimmer, M., Bethke, S., Zorn, G. T., JADE Collaboration, Bowdery, C. K., Cartwright, S. L., and Chrin, J.
- Subjects
two-photon [exchange] ,(pi+ pi-) [mass spectrum] ,pi [electroproduction] ,multiple production [pi] ,inelastic scattering: electron positron ,rho(770)0 [electroproduction] ,electron positron [inelastic scattering] ,multiple production: pi ,channel cross section: energy dependence ,electron positron [colliding beams] ,electroproduction [pi] ,36.4 GeV-cms ,electroproduction [rho(770)0] ,electroproduction: rho(770)0 ,electron positron: colliding beams ,boson: statistics ,energy dependence [channel cross section] ,DESY PETRA Stor ,colliding beams [electron positron] ,two-photon: exchange ,two-pion [correlation function] ,electroproduction: pi ,(pi+ pi-): mass spectrum ,mass spectrum [(pi+ pi-)] ,statistics [boson] ,electron positron: inelastic scattering ,correlation function: two-pion ,exclusive reaction [photon photon] ,pi: electroproduction ,+3pi%2B+3pi-+positron+electron%22">electron positron --> 3pi+ 3pi- positron electron ,rho(770)0: multiplicity ,ddc:530 ,+2rho%28770%290+pi%2B+pi-+positron+electron%22">electron positron --> 2rho(770)0 pi+ pi- positron electron ,rho(770)0: electroproduction ,exchange: two-photon ,photon photon: exclusive reaction ,pi: multiple production ,inelastic scattering [electron positron] ,pi [multiple production] ,mass spectrum: (pi+ pi-) ,bibliography ,+rho%28770%290+2pi%2B+2pi-+positron+electron%22">electron positron --> rho(770)0 2pi+ 2pi- positron electron ,colliding beams: electron positron ,JADE ,multiplicity [rho(770)0] ,exchange [two-photon] ,experimental results - Abstract
22 pp. (1991)., The reactionγγ→3π+3π- has been studied usig the JADE detector at PETRA. The topological cross sectionσ(γγ→3π+3π-) was measured in the CM energy range 1.5–5.5 GeV. The production ofρ0,s was observed and the average number ofρ0,s per event measured. The contributions of the subprocessesγγ→ρ02π+2π-,γγ→ρ0ρ0π+2π- andγγ→ 3π+3π- (phase space) were studied and 95% C.L. upper limits for the cross sectionσ(γγ→ρ0ρ0π+π- determined. Finally the Bose-Einstein correlation for pairs of like signed pions was observed. A fit to a standard parametrization gave results consistent with other studies of this effect in pion systems.
- Published
- 1991
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