Inclusive π0 and KS 0 production in two-photon collisions at LEP

Pablo Achard,Oscar S. Adriáni,M. Aguilar-Benítez,Juan Alcaraz,G. Alemanni,Jim V. Allaby,Alberto Aloisio,M. G. Alviggi,Hans B. Anderhub,V. P. Andreev,F. Anselmo,A. S. Arefiev,Tofigh Azemoon,T. Aziz,Marc M. Baarmand,Paolo Bagnaia,A. Bajo,Gyöngyi Baksay,László A. Baksay,S. V. Baldew,Sw W. Banerjee,Artur Barczyk,R. Barillère,Paolo Bartalini,Maurizio Basile,N. V. Batalova,Roberto Battiston,Aurelio Bay,Francesco Becattini,Ulrich J. Becker,F. Behner,Luca Bellucci,Ross I. Berbeco,J. Berdugo,P. Berges,Bruna Bertucci,Botio L. Betev,Maurizio Biasini,M. G. Biglietti,Adrian Biland,JJ J. Blaising,S. C. Blyth,GJ J. Bobbink,Albrecht Böhm,László Boldizsár,Bruno Borgia,Sergio Bottai,Dimitri Bourilkov,Maurice H. Bourquin,Stefano Braccini,James G. Branson,Frederic M. Brochu,A. Buijs,Joseph D. Bürger,William J. Burger,Xu Cai,Michael Capell,G. Cara Romeo,Gianpaolo P. Carlino,Annamaria M. Cartacci,Jorge Casaus,Francesca Cavallari,Nicola Cavallo,Claudia Cecchi,M. Cerrada,M. Chamizo Chamizo,Yun Chang,M. Chemarin,Augustine E. Chen,Guoming Chen,G. M. Chen,Hui Chen,Hesheng Chen,G. V. Chiefari,Luisa Cifarelli,Federico Cindolo,I. Clare,Robert M. Clare,Guy G. Coignet, N. Colino,Silvia Costantini,Begoña De La Cruz,Susanna Cücciarelli,J. A. Van Dalen,Riccardo De Asmundis,P. Déglon,J. Debreczeni,A. Degré,K. Deiters,D. Della Volpe,E. Delmeire,Peter Denes,Francesco De Notaristefani,Alessandro De Salvo,Marcella Diemoz,Mark Dierckxsens,D. van Dierendonck,Carla Dionisi,Michael Dittmar,Alessandra Doria,María Teresa Dova,Dominique Duchesneau,Pieter Duinker,Bertrand Echenard,A. Eline,Houmani El Mamouni,Arnold Engler,FJ J. Eppling,A. Ewers,P. Extermann,M. A. Falagán,Speranza Falciano,A. Favara, J. Fay,Oleg L. Fedin,Marta Felcini,T. Ferguson,Harm S. Fesefeldt,Emanuele Fiandrini,John H. Field,Frank Filthaut,PH H. Fisher,Wade C. Fisher,Ian M. Fisk,G. Forconì,Kai Freüdenreich,Claudio Furetta,Yu U. Galaktionov,Som N. Ganguli,Pablo García-Abia,Marat Gataullin,Simonetta Gentile,Stefano Giagu,Zhufang Gong,Gérald J. Grenier,Oliver Grimm,M. W. Gruenewald,Maurizio Guida,R. Van Gulik,VK K. Gupta,Atul Gurtu,LJ J. Gutay,Daniel Haas,Despoina Hatzifotiadou,Thomas Hebbeker,Alain E. Hervé,J. Hirschfelder,Hans Hofer,G. Holzner,Suen Hou,Yuan Hu,Bingnian Jin,Lawrence W. Jones,Paul De Jong,I. Josa-Mutuberría,Daniela Käfer,Maninder Pal Kaur,Maria Novella Kienzle-Focacci,JaeKwan Kim,Jasper Kirkby,Wolfram K. Kittel,Alexei Klimentov,A. C. König,Miroslav Kopál,Vladimir Koutsenko,M. Kräber,Robert W. Kraemer,W. Krenz,Andreas E. Krüger,A. V. Kunin,P. Ladrón De Guevara,Imad B. Laktineh,Gregorio Landi,Michel Lebeau,Alexei I. Lebedev,Paul L G Lebrun,Pierre Lecomte,Paul R. Lecoq,Pierre Le Coultre,H. J. Lee,Jean Marc Le Goff,R. Leiste,Peter M. Levtchenko,Cheng Li,S. A. Likhoded,Chihhsun Lin,Weiting Lin,F. L. Linde,Luca Lísta,Zhen'An Liu,Wolfgang Lohmann,Egidio Longo,Yusheng Lü,K. Lübelsmeyer,Claudio Luci,Lamberto Luminari,Werner Lüstermann,Wengan Ma,Luca Malgeri,A. Malinin,C. Maa,Dominique J J Mangeol, J. Mans,J. P. Martin,Frank Silvio Marzano,Kajari Mazumdar,Roger R. McNeil,Salvatore Mele,Leonardo Merola, M. Meschini,WJ J. Metzger,A. C. Mihul,H. Milcent,Giovanni Mirabelli,Joachim Mnich,Gagan B. Mohanty,G. S. Muanza,A. J M Muijs,B. Musicar,Marco Musy,Szilard Nagy,M. Napolitano,Francesca Nessi-Tedaldi,Harvey B. Newman,T. Niessen,Aleandro Nisati,Hannelies Nowak, R. A. Ofierzynski,Giovanni C. Organtini,Carmen Palomares,D. Pandoulas,Pierluigi S. Paolucci,Riccardo Paramatti,Giovanni Passaleva, S. Patricelli,Thomas C. Paul,M. Pauluzzi,Christoph Paus,Felicitas Paüss,M. Pedace,Simonetta Pensotti,Denis Perret-Gallix,Brian Aagaard Petersen,Davide Piccolo,Fabio Pierella,Michele Pioppí,PA A. Piroué,E. Pistolesi,Vassili V. Plyaskin,Martin Pohl, V. Pojidaev,J. Pothier,Denis O. Prokofiev,D. A. Prokofiev,J. Quartieri,Ghita Rahal-Callot,M. A. Rahaman,Péter Raics,N. Raja,Renzo Ramelli,P. G. Giorgio Rancoita,Riccardo Ranieri,Alexei Raspereza,Panos A. Razis,Daning Ren,Marco Rescigno,Stephen Reucroft,Sabine Riemann,Keith Riles,Byron P. Roe,Luciano Romero,Aura Rosca,Sylvie Rosier-Lees,Simon Roth,C. Rosenbleck,B. Roux,J. Alberto Rubio,Gennaro Ruggiero,Hans Rykaczewski,Alexander S. Sakharov,Saeed Saremi,Subir Sarkar,J. M. Salicio,Eusebio Sánchez,Marijn P A Sanders,Christoph Schäfer,V. A. Schegelsky,S. Schmidt-Kaerst,David W. Schmitz,Herwig F. Schopper,DJ J. Schotanus, G. Schwering,C. Sciacca,Leonello Servoli,S. Shevchenko,Naiden Shivarov,V. Shoutko,E. Shumilov,A. V. Shvorob,Th Siedenburg,Dongchul Son,Piero Spillantini,Malcolm F. Steuer,David P. Stickland,Basil J. Stoyanov,Arno Straessner, K. Sudhakar,G. G. Sultanov,La-Zhen Sun,Sergey V. Sushkov,Henry Suter,John D. Swain,Zoltan Szillási,Xiaowei Tang,Péter Tarján,Ludwig Tauscher,Lucas L. Taylor,B. Tellili,Daniel Teyssier,Charles J W P Timmermans.,Samuel C C Ting,Steve Ting,Suresh C. Tonwar,József J. Tóth,Christopher G. Tully,Karen Tung,Jürgen Ulbricht,Enzo Valente,Remy T. Van De Walle,V. Veszprémi,György Vesztergombi,I. Vetlitsky,Domenico Vicinanza,Gert M. Viertel,Stefano Villa,M. Vivargent,Sotirios Vlachos,Igor Vodopianov,Helmut R. Vogel,Hans G. Vogt,Igor A. Vorobiev,An A. Vorobyov,M. Wadhwa,Wolfgang Wallraff,Xiaolian Wang,Zhaomin Wang,Marc S. Weber,Peter Wienemann,Henric G S Wilkens,St Wynhoff,Lirong Xia,Zizong Xu,J. Yamamoto,Bin Yang,Changgen Yang,Haijun Yang,Min Yang,S. C. Yeh,An N. Zalite,Yu U. Zalite,Ziping Zhang,Jiawei Zhao,Guoyi Zhu,Renyuan Zhu,Honglin Zhuang,Antonino Zichichi,Gy Zilizi,Bruno Zimmermann,M. Z. Zöller

Physics Letters B（2002）

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摘要

The reactions e+e−→e+e− π 0 X and e+e−→e+e−KS 0 X are studied using data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 202 GeV. Inclusive differential cross sections are measured as a function of the particle transverse momentum p t and the pseudo-rapidity. For p t ⩽1.5 GeV, the π 0 and KS 0 differential cross sections are described by an exponential, typical of soft hadronic processes. For p t ⩾1.5 GeV, the cross sections show the presence of perturbative QCD processes, described by a power-law. The data are compared to Monte Carlo predictions and to NLO QCD calculations.

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