1. Formation of the Pseudoscalars $\pi^0$, $\eta$ and $\eta^\prime$ in the Reaction $\gamma \gamma \to \gamma \gamma$
- Author
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Williams, D., Antreasyan, D., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Drews, G., Bartels, H. W. S., Engler, A., Fairfield, K., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Heimlich, F. H., Hofstadter, R., Besset, D., Irion, J., Jakubowski, Z., Karch, K., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W. S., Konig, A. C., Bieler, C., Konigsmann, Kay, Kraemer, R. W. S., Kruger, S., Landi, G., Lee, Roger A., Leffler, S., Lekebusch, R., Lockman, William S., Lowe, S., Lurz, B., Bienlein, J. K., Marlow, Daniel R., Marsiske, H., Maschmann, W. S., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Monteleoni, B., Nernst, R., Niczyporuk, B., Bizzeti, A., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Bloom, Elliott D., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, Andreas S., Selonke, F., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Brock, I., Strohbusch, U., Tompkins, J., Trost, H. J., Van de Walle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W. S., Brockmuller, K., Wegener, H., Zschorsch, P., and Crystal Ball Collaboration
- Subjects
PSEUDOSCALAR MESON [ELECTROPRODUCTION] ,ELECTRON POSITRON [INELASTIC SCATTERING] ,SEARCH FOR [NARROW RESONANCE] ,BIBLIOGRAPHY ,WIDTH [ETA] ,UPPER LIMIT ,+POSITRON+ELECTRON+2PHOTON%22">ELECTRON POSITRON --> POSITRON ELECTRON 2PHOTON ,EXCLUSIVE REACTION [PHOTON PHOTON] ,RADIATIVE DECAY [PSEUDOSCALAR MESON] ,WIDTH [ETA(958)] ,+2PHOTON%22">PSEUDOSCALAR MESON --> 2PHOTON ,9.4-10.6 GEV-CMS ,ELECTROPRODUCTION [PSEUDOSCALAR MESON] ,ddc:530 ,EXPERIMENTAL RESULTS ,DESY DORIS II STOR ,TWO-PHOTON [EXCHANGE] ,EXCHANGE [TWO-PHOTON] ,COLLIDING BEAMS [ELECTRON POSITRON] ,INELASTIC SCATTERING [ELECTRON POSITRON] ,NARROW RESONANCE [SEARCH FOR] ,WIDTH [PI0] ,ELECTRON POSITRON [COLLIDING BEAMS] ,+PSEUDOSCALAR+MESON+POSITRON+ELECTRON%22">ELECTRON POSITRON --> PSEUDOSCALAR MESON POSITRON ELECTRON ,PSEUDOSCALAR MESON [RADIATIVE DECAY] ,BRANCHING RATIO [WIDTH] ,Crystal Ball - Abstract
The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reaction e+e−→e+e−γ*γ*→e+e−γγ, where X is a narrow resonance with mass between 100 and 3000 MeV. Formation of π0, η, and η’ mesons is observed, and the following meson partial widths are obtained: Γπ0Γ0→γγ=7.7±0.5±0.5 eV, Γη−γγ=0.514±0.017±0.035 keV, and Γη’→γγ=4.7±0.5±0.5 keV. No other narrow resonances are observed, and upper limits are given for the product ΓX→γγBX→γγ. .AE
- Published
- 1988
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