First observation of γγ → ωϱ0

• Published in: Physics letters. B 1987-09, Vol.196 (1), p.101-106
• Main Authors: Albrecht, H., Andam, A.A., Binder, U., Böckmann, P., Gläser, R., Harder, G., Nippe, A., Schäfer, M., Schmidt-Parzefall, W., Schröder, H., Schulz, H.D., Wurth, R., Yagil, A., Donker, J.P., Drescher, A., Kamp, D., Kolanoski, H., Matthiesen, U., Scheck, H., Spaan, B., Spengler, J., Wegener, D., Ehmann, C., Gabriel, J.C., Ruf, T., Schubert, K.R., Stiewe, J., Strahl, K., Waldi, R., Weseler, S., Edwards, K.W., Frisken, W.R., Gilkinson, D.J., Gingrich, D.M., Kapitza, H., Kim, P.C.H., Kutschke, R., Macfarlane, D.B., McKenna, J.A., McLean, K.W., Nilsson, A.W., Orr, R.S., Padley, P., Parsons, J.A., Patel, P.M., Prentice, J.D., Seywerd, H.C.J., Swain, J.D., Tsipolitis, G., Yoon, T.-S., Yun, J.C., Ammar, R., Coppage, D., Davis, R., Kanekal, S., Kwak, N., Boštjančič, B., Kernel, G., Pleško, M., Jönsson, L., Babaev, A., Danilov, M., Fominykh, B., Golutvin, A., Gorelov, I., Lubimov, V., Matveev, V., Nagovitsin, V., Ryltsov, V., Semenov, A., Shevchenko, V., Soloshenko, V., Tchistilin, V., Tichomirov, I., Zaitsev, Yu, Childers, R., Darden, C.W., Oku, Y., Gennow, H.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(87)91684-4

The reaction γγ → 2 π +2 π − π 0 has been studied using the the ARGUS detector at the e +e − storage ring DORIS II at DESY. The production of the vector-meson pair ωϱ 0 is observed for the first time. The cross section for γγ → ωϱ 0 and the topological cross section for γγ → 2 π +2 π − π 0 are given. The angular distribution in ωϱ 0 events do not indicate any specific dominant spin-parity; they are consistent with isotropic production and decay of the ω and ϱ 0 mesons over the available W γγ range.