f1(1285) formation in two-photon collisions at LEP

• Published in: Physics letters. B Vol. 526; no. 3-4; pp. 269 - 277
• Main Authors: Arefiev, A., Bagnaia, P., Baksay, G., Biland, A., Boldizsar, L., Branson, J.G., Casaus, J., Chang, Y.H., Chemarin, M., Chen, G.M., de la Cruz, B., de Asmundis, R., De Salvo, A., Dittmar, M., Dova, M.T., Engler, A., Ewers, A., Extermann, P., Favara, A., Fay, J., Fedin, O., Felcini, M., Fesefeldt, H., Fiandrini, E., Field, J.H., Forconi, G., Freudenreich, K., Ganguli, S.N., Gataullin, M., Gong, Z.F., Grimm, O., Guida, M., Gutay, L.J., Hatzifotiadou, D., Hervé, A., Hirschfelder, J., Hofer, H., Hou, S.R., Käfer, D., Kaur, M., Kirkby, J., Lebeau, M., Lecomte, P., Li, C., Linde, F.L., Longo, E., Lu, Y.S., Ma, W.G., Martin, J.P., Mazumdar, K., Mirabelli, G., Mohanty, G.B., Muijs, A.J.M., Musy, M., Nessi-Tedaldi, F., Niessen, T., Nisati, A., Passaleva, G., Paus, C., Pauss, F., Pensotti, S., Pierella, F., Pohl, M., Prokofiev, D.O., Raja, N., Rancoita, P.G., Ranieri, R., Rescigno, M., Riles, K., Rosca, A., Rosenbleck, C., Ruggiero, G., Sakharov, A., Sanders, M.P., Schmidt-Kaerst, S., Schmitz, D., Schopper, H., Sciacca, C., Shoutko, V., Son, D., Straessner, A., Suter, H., Swain, J.D., Tauscher, L., Taylor, L., Tellili, B., Teyssier, D., Ting, S.M., Ulbricht, J., Vlachos, S., Vodopianov, I., Wallraff, W., Weber, M., Wilkens, H., Xia, L., Yamamoto, J., Zalite, Yu, Zhao, J., Zichichi, A., Zimmermann, B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-02-2002
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(01)01477-0

The ηπ+π− final state in two-photon collisions is studied with the L3 detector at LEP, at centre-of-mass energies from 183 to 209 GeV with an integrated luminosity of 664.6 pb−1. The f1(1285) meson is observed and the Q2 dependence of its production is compared to different form factor models. The γγ-coupling parameter Γγγ is found to be 3.5±0.6(stat.)±0.5(sys.) keV. The branching fraction Γ(f1(1285)→a0π)/Γ(f1(1285)→ηππ) is also measured.