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

P. Achard,O. Adriani,M. Aguilar-Benitez,J. Alcaraz,G. Alemanni,J. Allaby,A. Aloisio,M.G. Alviggi,H. Anderhub,V.P. Andreev, F. Anselmo, A. Arefiev, T. Azemoon,T. Aziz, P. Bagnaia, A. Bajo, G. Baksay, L. Baksay,S.V. Baldew,S. Banerjee,Sw. Banerjee,A. Barczyk, R. Barillère,P. Bartalini,M. Basile, N. Batalova,R. Battiston, A. Bay, F. Becattini,U. Becker, F. Behner,L. Bellucci,R. Berbeco,J. Berdugo, P. Berges, B. Bertucci,B.L. Betev, M. Biasini, M. Biglietti,A. Biland, J.J. Blaising,S.C. Blyth, G.J. Bobbink,A. Böhm, L. Boldizsar, B. Borgia,S. Bottai,D. Bourilkov, M. Bourquin, S. Braccini, J.G. Branson,F. Brochu,A. Buijs, J.D. Burger, W.J. Burger, X.D. Cai, M. Capell,G. Cara Romeo,G. Carlino, A. Cartacci, J. Casaus,F. Cavallari, N. Cavallo,C. Cecchi, M. Cerrada,M. Chamizo,Y.H. Chang, M. Chemarin, A. Chen,G. Chen,G.M. Chen, H.F. Chen, H.S. Chen, G. Chiefari, L. Cifarelli, F. Cindolo,I. Clare, R. Clare,G. Coignet, N. Colino, S. Costantini,B. de la Cruz, S. Cucciarelli,J.A. van Dalen,R. de Asmundis, P. Déglon, J. Debreczeni, A. Degré, K. Deiters,D. della Volpe, E. Delmeire,P. Denes, F. DeNotaristefani,A. De Salvo, M. Diemoz,M. Dierckxsens,D. van Dierendonck, C. Dionisi, M. Dittmar,A. Doria,M.T. Dova,D. Duchesneau,P. Duinker,B. Echenard, A. Eline,H. El Mamouni, A. Engler, F.J. Eppling, A. Ewers,P. Extermann,M.A. Falagan, S. Falciano, A. Favara, J. Fay,O. Fedin, M. Felcini,T. Ferguson, H. Fesefeldt,E. Fiandrini, J.H. Field, F. Filthaut, P.H. Fisher,W. Fisher,I. Fisk, G. Forconi, K. Freudenreich, C. Furetta,Yu. Galaktionov,S.N. Ganguli, P. Garcia-Abia, M. Gataullin,S. Gentile, S. Giagu, Z.F. Gong, G. Grenier,O. Grimm, M.W. Gruenewald, M. Guida,R. van Gulik,V.K. Gupta,A. Gurtu, L.J. Gutay,D. Haas, D. Hatzifotiadou, T. Hebbeker,A. Hervé, J. Hirschfelder, H. Hofer, M. Hohlmann, G. Holzner,S.R. Hou,Y. Hu, B.N. Jin, L.W. Jones,P. de Jong, I. Josa-Mutuberrı́a, D. Käfer,M. Kaur,M.N. Kienzle-Focacci,J.K. Kim,J. Kirkby, W. Kittel,A. Klimentov, A.C. König, M. Kopal,V. Koutsenko, M. Kräber, R.W. Kraemer, W. Krenz,A. Krüger, A. Kunin,P. Ladron de Guevara,I. Laktineh,G. Landi,M. Lebeau, A. Lebedev, P. Lebrun,P. Lecomte, P. Lecoq,P. Le Coultre,J.M. Le Goff, R. Leiste, P. Levtchenko,C. Li,S. Likhoded,C.H. Lin, W.T. Lin, F.L. Linde, L. Lista, Z.A. Liu, W. Lohmann,E. Longo, Y.S. Lu,K. Lübelsmeyer,C. Luci, L. Luminari, W. Lustermann, W.G. Ma, L. Malgeri, A. Malinin, C. Maña, D. Mangeol, J. Mans, J.P. Martin, F. Marzano, K. Mazumdar, R.R. McNeil, S. Mele,L. Merola, M. Meschini,W.J. Metzger,A. Mihul, H. Milcent, G. Mirabelli, J. Mnich, G.B. Mohanty, G.S. Muanza,A.J.M. Muijs, B. Musicar,M. Musy,S. Nagy,S. Natale,M. Napolitano, F. Nessi-Tedaldi, H. Newman, T. Niessen, A. Nisati,H. Nowak, R. Ofierzynski,G. Organtini, C. Palomares, D. Pandoulas,P. Paolucci,R. Paramatti, G. Passaleva, S. Patricelli, T. Paul, M. Pauluzzi,C. Paus, F. Pauss, M. Pedace, S. Pensotti, D. Perret-Gallix,B. Petersen, D. Piccolo, F. Pierella,M. Pioppi,P.A. Piroué, E. Pistolesi, V. Plyaskin, M. Pohl, V. Pojidaev, J. Pothier, D.O. Prokofiev, D. Prokofiev, J. Quartieri, G. Rahal-Callot,M.A. Rahaman, P. Raics, N. Raja,R. Ramelli,P.G. Rancoita, R. Ranieri, A. Raspereza,P. Razis,D. Ren, M. Rescigno,S. Reucroft, S. Riemann,K. Riles,B.P. Roe,L. Romero,A. Rosca,S. Rosier-Lees,S. Roth, C. Rosenbleck,B. Roux,J.A. Rubio,G. Ruggiero, H. Rykaczewski,A. Sakharov,S. Saremi,S. Sarkar, J. Salicio,E. Sanchez, M.P. Sanders,C. Schäfer, V. Schegelsky, S. Schmidt-Kaerst,D. Schmitz, H. Schopper, D.J. Schotanus, G. Schwering, C. Sciacca,L. Servoli,S. Shevchenko, N. Shivarov, V. Shoutko, E. Shumilov, A. Shvorob, T. Siedenburg,D. Son, P. Spillantini, M. Steuer,D.P. Stickland, B. Stoyanov, A. Straessner, K. Sudhakar, G. Sultanov, L.Z. Sun, S. Sushkov, H. Suter, J.D. Swain, Z. Szillasi, X.W. Tang,P. Tarjan,L. Tauscher,L. Taylor,B. Tellili, D. Teyssier, C. Timmermans,Samuel C.C. Ting, S.M. Ting,S.C. Tonwar,J. Tóth, C. Tully,K.L. Tung, J. Ulbricht,E. Valente,R.T. Van de Walle, V. Veszpremi, G. Vesztergombi, I. Vetlitsky,D. Vicinanza,G. Viertel,S. Villa, M. Vivargent,S. Vlachos, I. Vodopianov, H. Vogel,H. Vogt, I. Vorobiev, A.A. Vorobyov,M. Wadhwa,W. Wallraff, X.L. Wang, Z.M. Wang, M. Weber, P. Wienemann,H. Wilkens, S. Wynhoff, L. Xia,Z.Z. Xu,J. Yamamoto, B.Z. Yang,C.G. Yang, H.J. Yang,M. Yang,S.C. Yeh,An. Zalite,Yu. Zalite, Z.P. Zhang,J. Zhao,G.Y. Zhu,R.Y. Zhu, H.L. Zhuang, A. Zichichi, G. Zilizi, B. Zimmermann, M.Z. Zöller

user-5da93e5d530c70bec9508e2b(2002)

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摘要
Abstract 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 f 1 (1285) meson is observed and the Q 2 dependence of its production is compared to different form factor models. The γγ -coupling parameter Γ γγ is found to be 3.5±0.6(stat.)±0.5(sys.) keV. The branching fraction Γ (f 1 (1285)→a 0 π )/ Γ (f 1 (1285)→ ηππ ) is also measured.
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关键词
Branching fraction,Meson,Form factor (quantum field theory),Luminosity (scattering theory),Nuclear physics,Particle physics,Coupling parameter,Physics,Two-photon excitation microscopy
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