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Double-tag events 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 (+358 others)
2002 Physics Letters B  

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2001 pre-print
arXiv:hep-ex/0111012v1 fatcat:zljgkvl375fxlec2csxlq3vlcm
2002 accepted
arXiv:hep-ex/0111012v2 fatcat:q7swgxo7nfdutbgfdrdud5sh4e
Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from root(s)=189 GeV to 209 GeV. The cross sections of the e+e- -> e+e- hadrons and gamma*gamma* -> hadrons processes are measured as a function of the photon virtualities, Q1^2 and Q2^2, of the two-photon mass, W_gammagamma, and of the variable Y=ln(W_gammagamma^2/(Q1 Q2)), for an average photon virtuality = 16 GeV2. The results are in agreement with next-to-leading order calculations
more » ... the process gamma*gamma* -> q qbar in the interval 2 <= Y <= 5. An excess is observed in the interval 5 < Y <= 7, corresponding to W_gammagamma greater than 40 GeV . This may be interpreted as a sign of resolved photon QCD processes or the onset of BFKL phenomena.
doi:10.1016/s0370-2693(02)01340-0 fatcat:tp7sbwphdnb5dgmhzeasag5zze
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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. "Double-tag events in two-photon collisions at LEP." Physics Letters B 531.1-2 (2002) 39-51