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Double-Tag Events in Two-Photon Collisions at LEP
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, Q2_1 and Q2_2...
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Lenguaje: | eng |
Publicado: |
2001
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/S0370-2693(02)01340-0 http://cds.cern.ch/record/525245 |
_version_ | 1780897889288978432 |
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author | Achard, P. Adriani, O. Aguilar-Benitez, M. Alcaraz, J. Alemanni, G. Allaby, J. Aloisio, A. Alviggi, M.G. Anderhub, H. Andreev, Valery P. Anselmo, F. Arefev, A. Azemoon, T. Aziz, T. Bagnaia, P. Bajo, A. Baksay, G. Baksay, L. Baldew, S.V. Banerjee, S. Banerjee, Sw. Barczyk, A. Barillere, R. Bartalini, P. Basile, M. Batalova, N. Battiston, R. Bay, A. Becattini, F. Becker, U. Behner, F. Bellucci, L. Berbeco, R. Berdugo, J. Berges, P. Bertucci, B. Betev, B.L. Biasini, M. Biglietti, M. Biland, A. Blaising, J.J. Blyth, S.C. Bobbink, G.J. Bohm, A. Boldizsar, L. Borgia, B. Bottai, S. Bourilkov, D. Bourquin, M. Braccini, S. Branson, J.G. Brochu, F. Buijs, A. Burger, J.D. Burger, W.J. Cai, X.D. Capell, M. Cara Romeo, G. Carlino, G. Cartacci, A. Casaus, J. Cavallari, F. Cavallo, N. Cecchi, C. Cerrada, M. Chamizo, M. Chang, Y.H. Chemarin, M. Chen, A. Chen, G. Chen, G.M. Chen, H.F. Chen, H.S. Chiefari, G. Cifarelli, L. Cindolo, F. Clare, I. Clare, R. Coignet, G. Colino, N. Costantini, S. de la Cruz, B. Cucciarelli, S. van Dalen, J.A. de Asmundis, R. Deglon, P. Debreczeni, J. Degre, A. Deiters, K. della Volpe, D. Delmeire, E. Denes, P. DeNotaristefani, F. De Salvo, A. Diemoz, M. Dierckxsens, M. van Dierendonck, D. Dionisi, C. Dittmar, M. Doria, A. Dova, M.T. Duchesneau, D. Duinker, P. Echenard, B. Eline, A. El Mamouni, H. Engler, A. Eppling, F.J. Ewers, A. Extermann, P. Falagan, M.A. Falciano, S. Favara, A. Fay, J. Fedin, O. Felcini, M. Ferguson, T. Fesefeldt, H. Fiandrini, E. Field, J.H. Filthaut, F. Fisher, P.H. Fisher, W. Fisk, I. Forconi, G. Freudenreich, K. Furetta, C. Galaktionov, Iouri Ganguli, S.N. Garcia-Abia, Pablo Gataullin, M. Gentile, S. Giagu, S. Gong, Z.F. Grenier, Gerald Jean Grimm, O. Gruenewald, M.W. Guida, M. van Gulik, R. Gupta, V.K. Gurtu, A. Gutay, L.J. Haas, D. Hatzifotiadou, D. Hebbeker, T. Herve, Alain Hirschfelder, J. Hofer, H. Hohlmann, M. Holzner, G. Hou, S.R. Hu, Y. Jin, B.N. Jones, Lawrence W. de Jong, P. Josa-Mutuberria, I. Kafer, D. Kaur, M. Kienzle-Focacci, M.N. Kim, J.K. Kirkby, Jasper Kittel, W. Klimentov, A. Konig, A.C. Kopal, M. Koutsenko, V. Kraber, M. Kraemer, R.W. Krenz, W. Kruger, A. Kunin, A. Ladron de Guevara, P. Laktineh, I. Landi, G. Lebeau, M. Lebedev, A. Lebrun, P. Lecomte, P. Lecoq, P. Le Coultre, P. Le Goff, J.M. Leiste, R. Levtchenko, P. Li, C. Likhoded, S. Lin, C.H. Lin, W.T. Linde, F.L. Lista, L. Liu, Z.A. Lohmann, W. Longo, E. Lu, Y.S. Lubelsmeyer, K. Luci, C. Luminari, L. Lustermann, W. Ma, W.G. Malgeri, L. Malinin, A. Mana, C. Mangeol, D. Mans, J. Martin, J.P. Marzano, F. Mazumdar, K. McNeil, R.R. Mele, S. Merola, L. Meschini, M. Metzger, W.J. Mihul, A. Milcent, H. Mirabelli, G. Mnich, J. Mohanty, G.B. Muanza, G.S. Muijs, A.J.M. Musicar, B. Musy, M. Nagy, S. Natale, S. Napolitano, M. Nessi-Tedaldi, F. Newman, H. Niessen, T. Nisati, A. Kluge, Hannelies Ofierzynski, R. Organtini, G. Palomares, C. Pandoulas, D. Paolucci, P. Paramatti, R. Passaleva, G. Patricelli, S. Paul, Thomas Cantzon Pauluzzi, M. Paus, C. Pauss, F. Pedace, M. Pensotti, S. Perret-Gallix, D. Petersen, B. Piccolo, D. Pierella, F. Pioppi, M. Piroue, P.A. Pistolesi, E. Plyaskin, V. Pohl, M. Pojidaev, V. Pothier, J. Prokofev, D.O. Prokofiev, D. Quartieri, J. Rahal-Callot, G. Rahaman, M.A. Raics, P. Raja, N. Ramelli, R. Rancoita, P.G. Ranieri, R. Raspereza, A. Razis, P. Ren, D. Rescigno, M. Reucroft, S. Riemann, S. Riles, Keith Roe, B.P. Romero, L. Rosca, A. Rosier-Lees, S. Roth, Stefan Rosenbleck, C. Roux, B. Rubio, J.A. Ruggiero, G. Rykaczewski, H. Sakharov, A. Saremi, S. Sarkar, S. Salicio, J. Sanchez, E. Sanders, M.P. Schafer, C. Schegelsky, V. Schmidt-Kaerst, S. Schmitz, D. Schopper, H. Schotanus, D.J. Schwering, G. Sciacca, C. Servoli, L. Shevchenko, S. Shivarov, N. Shoutko, V. Shumilov, E. Shvorob, A. Siedenburg, T. Son, D. Spillantini, P. Steuer, M. Stickland, D.P. Stoyanov, B. Straessner, A. Sudhakar, K. Sultanov, G. Sun, L.Z. Sushkov, S. Suter, H. Swain, J.D. Szillasi, Z. Tang, X.W. Tarjan, P. Tauscher, L. Taylor, L. Tellili, B. Teyssier, D. Timmermans, Charles Ting, Samuel C.C. Ting, S.M. Tonwar, S.C. Toth, J. Tully, C. Tung, K.L. Ulbricht, J. Valente, E. Van de Walle, R.T. Veszpremi, V. Vesztergombi, G. Vetlitsky, I. Vicinanza, D. Viertel, G. Villa, S. Vivargent, M. Vlachos, S. Vodopianov, I. Vogel, H. Vogt, H. Vorobev, I. Vorobyov, A.A. Wadhwa, M. Wallraff, W. Wang, X.L. Wang, Z.M. Weber, M. Wienemann, P. Wilkens, H. Wynhoff, S. Xia, L. Xu, Z.Z. Yamamoto, J. Yang, B.Z. Yang, C.G. Yang, H.J. Yang, M. Yeh, S.C. Zalite, A. Zalite, Yu. Zhang, Z.P. Zhao, J. Zhu, G.Y. Zhu, R.Y. Zhuang, H.L. Zichichi, A. Zilizi, G. Zimmermann, B. Zoller, M. |
author_facet | Achard, P. Adriani, O. Aguilar-Benitez, M. Alcaraz, J. Alemanni, G. Allaby, J. Aloisio, A. Alviggi, M.G. Anderhub, H. Andreev, Valery P. Anselmo, F. Arefev, A. Azemoon, T. Aziz, T. Bagnaia, P. Bajo, A. Baksay, G. Baksay, L. Baldew, S.V. Banerjee, S. Banerjee, Sw. Barczyk, A. Barillere, R. Bartalini, P. Basile, M. Batalova, N. Battiston, R. Bay, A. Becattini, F. Becker, U. Behner, F. Bellucci, L. Berbeco, R. Berdugo, J. Berges, P. Bertucci, B. Betev, B.L. Biasini, M. Biglietti, M. Biland, A. Blaising, J.J. Blyth, S.C. Bobbink, G.J. Bohm, A. Boldizsar, L. Borgia, B. Bottai, S. Bourilkov, D. Bourquin, M. Braccini, S. Branson, J.G. Brochu, F. Buijs, A. Burger, J.D. Burger, W.J. Cai, X.D. Capell, M. Cara Romeo, G. Carlino, G. Cartacci, A. Casaus, J. Cavallari, F. Cavallo, N. Cecchi, C. Cerrada, M. Chamizo, M. Chang, Y.H. Chemarin, M. Chen, A. Chen, G. Chen, G.M. Chen, H.F. Chen, H.S. Chiefari, G. Cifarelli, L. Cindolo, F. Clare, I. Clare, R. Coignet, G. Colino, N. Costantini, S. de la Cruz, B. Cucciarelli, S. van Dalen, J.A. de Asmundis, R. Deglon, P. Debreczeni, J. Degre, A. Deiters, K. della Volpe, D. Delmeire, E. Denes, P. DeNotaristefani, F. De Salvo, A. Diemoz, M. Dierckxsens, M. van Dierendonck, D. Dionisi, C. Dittmar, M. Doria, A. Dova, M.T. Duchesneau, D. Duinker, P. Echenard, B. Eline, A. El Mamouni, H. Engler, A. Eppling, F.J. Ewers, A. Extermann, P. Falagan, M.A. Falciano, S. Favara, A. Fay, J. Fedin, O. Felcini, M. Ferguson, T. Fesefeldt, H. Fiandrini, E. Field, J.H. Filthaut, F. Fisher, P.H. Fisher, W. Fisk, I. Forconi, G. Freudenreich, K. Furetta, C. Galaktionov, Iouri Ganguli, S.N. Garcia-Abia, Pablo Gataullin, M. Gentile, S. Giagu, S. Gong, Z.F. Grenier, Gerald Jean Grimm, O. Gruenewald, M.W. Guida, M. van Gulik, R. Gupta, V.K. Gurtu, A. Gutay, L.J. Haas, D. Hatzifotiadou, D. Hebbeker, T. Herve, Alain Hirschfelder, J. Hofer, H. Hohlmann, M. Holzner, G. Hou, S.R. Hu, Y. Jin, B.N. Jones, Lawrence W. de Jong, P. Josa-Mutuberria, I. Kafer, D. Kaur, M. Kienzle-Focacci, M.N. Kim, J.K. Kirkby, Jasper Kittel, W. Klimentov, A. Konig, A.C. Kopal, M. Koutsenko, V. Kraber, M. Kraemer, R.W. Krenz, W. Kruger, A. Kunin, A. Ladron de Guevara, P. Laktineh, I. Landi, G. Lebeau, M. Lebedev, A. Lebrun, P. Lecomte, P. Lecoq, P. Le Coultre, P. Le Goff, J.M. Leiste, R. Levtchenko, P. Li, C. Likhoded, S. Lin, C.H. Lin, W.T. Linde, F.L. Lista, L. Liu, Z.A. Lohmann, W. Longo, E. Lu, Y.S. Lubelsmeyer, K. Luci, C. Luminari, L. Lustermann, W. Ma, W.G. Malgeri, L. Malinin, A. Mana, C. Mangeol, D. Mans, J. Martin, J.P. Marzano, F. Mazumdar, K. McNeil, R.R. Mele, S. Merola, L. Meschini, M. Metzger, W.J. Mihul, A. Milcent, H. Mirabelli, G. Mnich, J. Mohanty, G.B. Muanza, G.S. Muijs, A.J.M. Musicar, B. Musy, M. Nagy, S. Natale, S. Napolitano, M. Nessi-Tedaldi, F. Newman, H. Niessen, T. Nisati, A. Kluge, Hannelies Ofierzynski, R. Organtini, G. Palomares, C. Pandoulas, D. Paolucci, P. Paramatti, R. Passaleva, G. Patricelli, S. Paul, Thomas Cantzon Pauluzzi, M. Paus, C. Pauss, F. Pedace, M. Pensotti, S. Perret-Gallix, D. Petersen, B. Piccolo, D. Pierella, F. Pioppi, M. Piroue, P.A. Pistolesi, E. Plyaskin, V. Pohl, M. Pojidaev, V. Pothier, J. Prokofev, D.O. Prokofiev, D. Quartieri, J. Rahal-Callot, G. Rahaman, M.A. Raics, P. Raja, N. Ramelli, R. Rancoita, P.G. Ranieri, R. Raspereza, A. Razis, P. Ren, D. Rescigno, M. Reucroft, S. Riemann, S. Riles, Keith Roe, B.P. Romero, L. Rosca, A. Rosier-Lees, S. Roth, Stefan Rosenbleck, C. Roux, B. Rubio, J.A. Ruggiero, G. Rykaczewski, H. Sakharov, A. Saremi, S. Sarkar, S. Salicio, J. Sanchez, E. Sanders, M.P. Schafer, C. Schegelsky, V. Schmidt-Kaerst, S. Schmitz, D. Schopper, H. Schotanus, D.J. Schwering, G. Sciacca, C. Servoli, L. Shevchenko, S. Shivarov, N. Shoutko, V. Shumilov, E. Shvorob, A. Siedenburg, T. Son, D. Spillantini, P. Steuer, M. Stickland, D.P. Stoyanov, B. Straessner, A. Sudhakar, K. Sultanov, G. Sun, L.Z. Sushkov, S. Suter, H. Swain, J.D. Szillasi, Z. Tang, X.W. Tarjan, P. Tauscher, L. Taylor, L. Tellili, B. Teyssier, D. Timmermans, Charles Ting, Samuel C.C. Ting, S.M. Tonwar, S.C. Toth, J. Tully, C. Tung, K.L. Ulbricht, J. Valente, E. Van de Walle, R.T. Veszpremi, V. Vesztergombi, G. Vetlitsky, I. Vicinanza, D. Viertel, G. Villa, S. Vivargent, M. Vlachos, S. Vodopianov, I. Vogel, H. Vogt, H. Vorobev, I. Vorobyov, A.A. Wadhwa, M. Wallraff, W. Wang, X.L. Wang, Z.M. Weber, M. Wienemann, P. Wilkens, H. Wynhoff, S. Xia, L. Xu, Z.Z. Yamamoto, J. Yang, B.Z. Yang, C.G. Yang, H.J. Yang, M. Yeh, S.C. Zalite, A. Zalite, Yu. Zhang, Z.P. Zhao, J. Zhu, G.Y. Zhu, R.Y. Zhuang, H.L. Zichichi, A. Zilizi, G. Zimmermann, B. Zoller, M. |
author_sort | Achard, P. |
collection | CERN |
description | 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, Q2_1 and Q2_2, of the two-photon mass, W_gammagamma, and of the variable Y=ln(W2_gammagamma/(Q_1Q_2)), for an average photon virtuality <Q2> = 16 GeV2. The results are in agreement with next-to-leading order calculations for 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. |
id | cern-525245 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2001 |
record_format | invenio |
spelling | cern-5252452022-01-28T09:10:58Zdoi:10.1016/S0370-2693(02)01340-0http://cds.cern.ch/record/525245engAchard, P.Adriani, O.Aguilar-Benitez, M.Alcaraz, J.Alemanni, G.Allaby, J.Aloisio, A.Alviggi, M.G.Anderhub, H.Andreev, Valery P.Anselmo, F.Arefev, A.Azemoon, T.Aziz, T.Bagnaia, P.Bajo, A.Baksay, G.Baksay, L.Baldew, S.V.Banerjee, S.Banerjee, Sw.Barczyk, A.Barillere, R.Bartalini, P.Basile, M.Batalova, N.Battiston, R.Bay, A.Becattini, F.Becker, U.Behner, F.Bellucci, L.Berbeco, R.Berdugo, J.Berges, P.Bertucci, B.Betev, B.L.Biasini, M.Biglietti, M.Biland, A.Blaising, J.J.Blyth, S.C.Bobbink, G.J.Bohm, A.Boldizsar, L.Borgia, B.Bottai, S.Bourilkov, D.Bourquin, M.Braccini, S.Branson, J.G.Brochu, F.Buijs, A.Burger, J.D.Burger, W.J.Cai, X.D.Capell, M.Cara Romeo, G.Carlino, G.Cartacci, A.Casaus, J.Cavallari, F.Cavallo, N.Cecchi, C.Cerrada, M.Chamizo, M.Chang, Y.H.Chemarin, M.Chen, A.Chen, G.Chen, G.M.Chen, H.F.Chen, H.S.Chiefari, G.Cifarelli, L.Cindolo, F.Clare, I.Clare, R.Coignet, G.Colino, N.Costantini, S.de la Cruz, B.Cucciarelli, S.van Dalen, J.A.de Asmundis, R.Deglon, P.Debreczeni, J.Degre, A.Deiters, K.della Volpe, D.Delmeire, E.Denes, P.DeNotaristefani, F.De Salvo, A.Diemoz, M.Dierckxsens, M.van Dierendonck, D.Dionisi, C.Dittmar, M.Doria, A.Dova, M.T.Duchesneau, D.Duinker, P.Echenard, B.Eline, A.El Mamouni, H.Engler, A.Eppling, F.J.Ewers, A.Extermann, P.Falagan, M.A.Falciano, S.Favara, A.Fay, J.Fedin, O.Felcini, M.Ferguson, T.Fesefeldt, H.Fiandrini, E.Field, J.H.Filthaut, F.Fisher, P.H.Fisher, W.Fisk, I.Forconi, G.Freudenreich, K.Furetta, C.Galaktionov, IouriGanguli, S.N.Garcia-Abia, PabloGataullin, M.Gentile, S.Giagu, S.Gong, Z.F.Grenier, Gerald JeanGrimm, O.Gruenewald, M.W.Guida, M.van Gulik, R.Gupta, V.K.Gurtu, A.Gutay, L.J.Haas, D.Hatzifotiadou, D.Hebbeker, T.Herve, AlainHirschfelder, J.Hofer, H.Hohlmann, M.Holzner, G.Hou, S.R.Hu, Y.Jin, B.N.Jones, Lawrence W.de Jong, P.Josa-Mutuberria, I.Kafer, D.Kaur, M.Kienzle-Focacci, M.N.Kim, J.K.Kirkby, JasperKittel, W.Klimentov, A.Konig, A.C.Kopal, M.Koutsenko, V.Kraber, M.Kraemer, R.W.Krenz, W.Kruger, A.Kunin, A.Ladron de Guevara, P.Laktineh, I.Landi, G.Lebeau, M.Lebedev, A.Lebrun, P.Lecomte, P.Lecoq, P.Le Coultre, P.Le Goff, J.M.Leiste, R.Levtchenko, P.Li, C.Likhoded, S.Lin, C.H.Lin, W.T.Linde, F.L.Lista, L.Liu, Z.A.Lohmann, W.Longo, E.Lu, Y.S.Lubelsmeyer, K.Luci, C.Luminari, L.Lustermann, W.Ma, W.G.Malgeri, L.Malinin, A.Mana, C.Mangeol, D.Mans, J.Martin, J.P.Marzano, F.Mazumdar, K.McNeil, R.R.Mele, S.Merola, L.Meschini, M.Metzger, W.J.Mihul, A.Milcent, H.Mirabelli, G.Mnich, J.Mohanty, G.B.Muanza, G.S.Muijs, A.J.M.Musicar, B.Musy, M.Nagy, S.Natale, S.Napolitano, M.Nessi-Tedaldi, F.Newman, H.Niessen, T.Nisati, A.Kluge, HanneliesOfierzynski, R.Organtini, G.Palomares, C.Pandoulas, D.Paolucci, P.Paramatti, R.Passaleva, G.Patricelli, S.Paul, Thomas CantzonPauluzzi, M.Paus, C.Pauss, F.Pedace, M.Pensotti, S.Perret-Gallix, D.Petersen, B.Piccolo, D.Pierella, F.Pioppi, M.Piroue, P.A.Pistolesi, E.Plyaskin, V.Pohl, M.Pojidaev, V.Pothier, J.Prokofev, D.O.Prokofiev, D.Quartieri, J.Rahal-Callot, G.Rahaman, M.A.Raics, P.Raja, N.Ramelli, R.Rancoita, P.G.Ranieri, R.Raspereza, A.Razis, P.Ren, D.Rescigno, M.Reucroft, S.Riemann, S.Riles, KeithRoe, B.P.Romero, L.Rosca, A.Rosier-Lees, S.Roth, StefanRosenbleck, C.Roux, B.Rubio, J.A.Ruggiero, G.Rykaczewski, H.Sakharov, A.Saremi, S.Sarkar, S.Salicio, J.Sanchez, E.Sanders, M.P.Schafer, C.Schegelsky, V.Schmidt-Kaerst, S.Schmitz, D.Schopper, H.Schotanus, D.J.Schwering, G.Sciacca, C.Servoli, L.Shevchenko, S.Shivarov, N.Shoutko, V.Shumilov, E.Shvorob, A.Siedenburg, T.Son, D.Spillantini, P.Steuer, M.Stickland, D.P.Stoyanov, B.Straessner, A.Sudhakar, K.Sultanov, G.Sun, L.Z.Sushkov, S.Suter, H.Swain, J.D.Szillasi, Z.Tang, X.W.Tarjan, P.Tauscher, L.Taylor, L.Tellili, B.Teyssier, D.Timmermans, CharlesTing, Samuel C.C.Ting, S.M.Tonwar, S.C.Toth, J.Tully, C.Tung, K.L.Ulbricht, J.Valente, E.Van de Walle, R.T.Veszpremi, V.Vesztergombi, G.Vetlitsky, I.Vicinanza, D.Viertel, G.Villa, S.Vivargent, M.Vlachos, S.Vodopianov, I.Vogel, H.Vogt, H.Vorobev, I.Vorobyov, A.A.Wadhwa, M.Wallraff, W.Wang, X.L.Wang, Z.M.Weber, M.Wienemann, P.Wilkens, H.Wynhoff, S.Xia, L.Xu, Z.Z.Yamamoto, J.Yang, B.Z.Yang, C.G.Yang, H.J.Yang, M.Yeh, S.C.Zalite, A.Zalite, Yu.Zhang, Z.P.Zhao, J.Zhu, G.Y.Zhu, R.Y.Zhuang, H.L.Zichichi, A.Zilizi, G.Zimmermann, B.Zoller, M.Double-Tag Events in Two-Photon Collisions at LEPParticle Physics - ExperimentDouble-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, Q2_1 and Q2_2, of the two-photon mass, W_gammagamma, and of the variable Y=ln(W2_gammagamma/(Q_1Q_2)), for an average photon virtuality <Q2> = 16 GeV2. The results are in agreement with next-to-leading order calculations for 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.Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from s =189 GeV to 209 GeV. The cross sections of the e + e − →e + e − hadrons and γ ∗ γ ∗ → hadrons processes are measured as a function of the product of the photon virtualities, Q 2 = Q 2 1 Q 2 2 , of the two-photon mass, W γγ , and of the variable Y =ln( W 2 γγ / Q 2 ). The average photon virtuality is 〈 Q 2 1 〉=〈 Q 2 2 〉=16 GeV 2 . The results are in agreement with next-to-leading order calculations for the process γ ∗ γ ∗ → q q ̄ in the interval 2⩽ Y ⩽5. An excess is observed in the interval 5< Y ⩽7, corresponding to W γγ greater than 40 GeV. This may be interpreted as a contribution of resolved photon QCD processes or the onset of BFKL phenomena.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 <Q2> = 16 GeV2. The results are in agreement with next-to-leading order calculations for 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.hep-ex/0111012CERN-EP-2001-075CERN-EP-2001-075CERN-L3-247oai:cds.cern.ch:5252452001-10-31 |
spellingShingle | Particle Physics - Experiment Achard, P. Adriani, O. Aguilar-Benitez, M. Alcaraz, J. Alemanni, G. Allaby, J. Aloisio, A. Alviggi, M.G. Anderhub, H. Andreev, Valery P. Anselmo, F. Arefev, A. Azemoon, T. Aziz, T. Bagnaia, P. Bajo, A. Baksay, G. Baksay, L. Baldew, S.V. Banerjee, S. Banerjee, Sw. Barczyk, A. Barillere, R. Bartalini, P. Basile, M. Batalova, N. Battiston, R. Bay, A. Becattini, F. Becker, U. Behner, F. Bellucci, L. Berbeco, R. Berdugo, J. Berges, P. Bertucci, B. Betev, B.L. Biasini, M. Biglietti, M. Biland, A. Blaising, J.J. Blyth, S.C. Bobbink, G.J. Bohm, A. Boldizsar, L. Borgia, B. Bottai, S. Bourilkov, D. Bourquin, M. Braccini, S. Branson, J.G. Brochu, F. Buijs, A. Burger, J.D. Burger, W.J. Cai, X.D. Capell, M. Cara Romeo, G. Carlino, G. Cartacci, A. Casaus, J. Cavallari, F. Cavallo, N. Cecchi, C. Cerrada, M. Chamizo, M. Chang, Y.H. Chemarin, M. Chen, A. Chen, G. Chen, G.M. Chen, H.F. Chen, H.S. Chiefari, G. Cifarelli, L. Cindolo, F. Clare, I. Clare, R. Coignet, G. Colino, N. Costantini, S. de la Cruz, B. Cucciarelli, S. van Dalen, J.A. de Asmundis, R. Deglon, P. Debreczeni, J. Degre, A. Deiters, K. della Volpe, D. Delmeire, E. Denes, P. DeNotaristefani, F. De Salvo, A. Diemoz, M. Dierckxsens, M. van Dierendonck, D. Dionisi, C. Dittmar, M. Doria, A. Dova, M.T. Duchesneau, D. Duinker, P. Echenard, B. Eline, A. El Mamouni, H. Engler, A. Eppling, F.J. Ewers, A. Extermann, P. Falagan, M.A. Falciano, S. Favara, A. Fay, J. Fedin, O. Felcini, M. Ferguson, T. Fesefeldt, H. Fiandrini, E. Field, J.H. Filthaut, F. Fisher, P.H. Fisher, W. Fisk, I. Forconi, G. Freudenreich, K. Furetta, C. Galaktionov, Iouri Ganguli, S.N. Garcia-Abia, Pablo Gataullin, M. Gentile, S. Giagu, S. Gong, Z.F. Grenier, Gerald Jean Grimm, O. Gruenewald, M.W. Guida, M. van Gulik, R. Gupta, V.K. Gurtu, A. Gutay, L.J. Haas, D. Hatzifotiadou, D. Hebbeker, T. Herve, Alain Hirschfelder, J. Hofer, H. Hohlmann, M. Holzner, G. Hou, S.R. Hu, Y. Jin, B.N. Jones, Lawrence W. de Jong, P. Josa-Mutuberria, I. Kafer, D. Kaur, M. Kienzle-Focacci, M.N. Kim, J.K. Kirkby, Jasper Kittel, W. Klimentov, A. Konig, A.C. Kopal, M. Koutsenko, V. Kraber, M. Kraemer, R.W. Krenz, W. Kruger, A. Kunin, A. Ladron de Guevara, P. Laktineh, I. Landi, G. Lebeau, M. Lebedev, A. Lebrun, P. Lecomte, P. Lecoq, P. Le Coultre, P. Le Goff, J.M. Leiste, R. Levtchenko, P. Li, C. Likhoded, S. Lin, C.H. Lin, W.T. Linde, F.L. Lista, L. Liu, Z.A. Lohmann, W. Longo, E. Lu, Y.S. Lubelsmeyer, K. Luci, C. Luminari, L. Lustermann, W. Ma, W.G. Malgeri, L. Malinin, A. Mana, C. Mangeol, D. Mans, J. Martin, J.P. Marzano, F. Mazumdar, K. McNeil, R.R. Mele, S. Merola, L. Meschini, M. Metzger, W.J. Mihul, A. Milcent, H. Mirabelli, G. Mnich, J. Mohanty, G.B. Muanza, G.S. Muijs, A.J.M. Musicar, B. Musy, M. Nagy, S. Natale, S. Napolitano, M. Nessi-Tedaldi, F. Newman, H. Niessen, T. Nisati, A. Kluge, Hannelies Ofierzynski, R. Organtini, G. Palomares, C. Pandoulas, D. Paolucci, P. Paramatti, R. Passaleva, G. Patricelli, S. Paul, Thomas Cantzon Pauluzzi, M. Paus, C. Pauss, F. Pedace, M. Pensotti, S. Perret-Gallix, D. Petersen, B. Piccolo, D. Pierella, F. Pioppi, M. Piroue, P.A. Pistolesi, E. Plyaskin, V. Pohl, M. Pojidaev, V. Pothier, J. Prokofev, D.O. Prokofiev, D. Quartieri, J. Rahal-Callot, G. Rahaman, M.A. Raics, P. Raja, N. Ramelli, R. Rancoita, P.G. Ranieri, R. Raspereza, A. Razis, P. Ren, D. Rescigno, M. Reucroft, S. Riemann, S. Riles, Keith Roe, B.P. Romero, L. Rosca, A. Rosier-Lees, S. Roth, Stefan Rosenbleck, C. Roux, B. Rubio, J.A. Ruggiero, G. Rykaczewski, H. Sakharov, A. Saremi, S. Sarkar, S. Salicio, J. Sanchez, E. Sanders, M.P. Schafer, C. Schegelsky, V. Schmidt-Kaerst, S. Schmitz, D. Schopper, H. Schotanus, D.J. Schwering, G. Sciacca, C. Servoli, L. Shevchenko, S. Shivarov, N. Shoutko, V. Shumilov, E. Shvorob, A. Siedenburg, T. Son, D. Spillantini, P. Steuer, M. Stickland, D.P. Stoyanov, B. Straessner, A. Sudhakar, K. Sultanov, G. Sun, L.Z. Sushkov, S. Suter, H. Swain, J.D. Szillasi, Z. Tang, X.W. Tarjan, P. Tauscher, L. Taylor, L. Tellili, B. Teyssier, D. Timmermans, Charles Ting, Samuel C.C. Ting, S.M. Tonwar, S.C. Toth, J. Tully, C. Tung, K.L. Ulbricht, J. Valente, E. Van de Walle, R.T. Veszpremi, V. Vesztergombi, G. Vetlitsky, I. Vicinanza, D. Viertel, G. Villa, S. Vivargent, M. Vlachos, S. Vodopianov, I. Vogel, H. Vogt, H. Vorobev, I. Vorobyov, A.A. Wadhwa, M. Wallraff, W. Wang, X.L. Wang, Z.M. Weber, M. Wienemann, P. Wilkens, H. Wynhoff, S. Xia, L. Xu, Z.Z. Yamamoto, J. Yang, B.Z. Yang, C.G. Yang, H.J. Yang, M. Yeh, S.C. Zalite, A. Zalite, Yu. Zhang, Z.P. Zhao, J. Zhu, G.Y. Zhu, R.Y. Zhuang, H.L. Zichichi, A. Zilizi, G. Zimmermann, B. Zoller, M. Double-Tag Events in Two-Photon Collisions at LEP |
title | Double-Tag Events in Two-Photon Collisions at LEP |
title_full | Double-Tag Events in Two-Photon Collisions at LEP |
title_fullStr | Double-Tag Events in Two-Photon Collisions at LEP |
title_full_unstemmed | Double-Tag Events in Two-Photon Collisions at LEP |
title_short | Double-Tag Events in Two-Photon Collisions at LEP |
title_sort | double-tag events in two-photon collisions at lep |
topic | Particle Physics - Experiment |
url | https://dx.doi.org/10.1016/S0370-2693(02)01340-0 http://cds.cern.ch/record/525245 |
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