Study ofη production in two-photon collisions

Autor: Braunschweig, W., Gerhards, R., Kirschfink, F. J., Martyn, H. -U., Bock, B., Fischer, H. M., Hartmann, H., Hartmann, J., Hilger, E., Jocksch, A., Mertens, V., Wedemeyer, R., Foster, B., Martin, A. J., Sephton, A. J., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Märtig, P., Notz, D., Pawlak, J. M., Posnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Barreiro, F., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Heath, G. P., Ratoff, P., Silvester, I., Tomalin, I., Veitch, E., Forden, G. E., Hart, J. C., Saxon, D. H., Brandt, S., Holder, M., Labarga, L., Duchovni, E., Eisenberg, Y., Hochman, D., Karshon, U., Lyons, L., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Shapira, A., Wainer, N., Yekutieli, G., Caldwell, A., Muller, D., Ritz, S., Strom, D., Takashima, M., Wicklund, E., Wu, Sau Lan, Zobernig, G.
Zdroj: Zeitschrift für Physik C Particles and Fields; December 1989, Vol. 41 Issue: 4 p533-538, 6p
Abstrakt: Production of theηc meson ine+e− quasireal two photon collisions has been looked for in three channels. The data were obtained from an integrated luminosity of 189 pb−1. Anηc signal is observed in two decay modes (Ks0K±π∓,π+π-π+π-) with a combined statistical significance of 3.5 standard deviations. Using the knownηc branching ratios to these channels and toK+K-π+π- the combined partialηc width to γγ isΓγγ(ηc). The first error is statistical, and the second one includes the systematic and branching ratio errors. Calculated as an upper limit we obtainΓγγ(ηc) (95% C.L., including the systematic error).
Databáze: Supplemental Index
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