Measurement of Exclusive Rho+rho- Production in Mid-Virtuality Two-Photon Interactions and Study of the Gamma Gamma* -> Rho Rho Process at LEP

P Achard,O Adriani,M Aguilar-Benitez,J Alcaraz,G Alemanni,J Allaby,A Aloisio,MG Alviggi,H Anderhub,VP Andreev,F Anselmo,A Arefiev,T Azemoon,T Aziz,P Bagnaia,A Bajo,G Baksay,L Baksay,S Baldew,S Banerjee,A Barczyk,R Barillere,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,BL Betev,M Biasini,M Biglietti,A Biland,JJ Blaising,SC Blyth,GJ Bobbink,A Bohm,L Boldizsar,B Borgia,S Bottai,D Bourilkov,M Bourquin,S Braccini,JG Branson,F Brochu, JD Burger,WJ Burger,XD Cai,M Capell,GC Romeo,G Carlino,A Cartacci,J Casaus,F Cavallari,N Cavallo,C Cecchi,M Cerrada,M Chamizo,YH Chang,M Chemarin, A Chen,G Chen,GM Chen, HF Chen, HS Chen,G Chiefari,L Cifarelli,F Cindolo,I Clare,R Clare,G Coignet,N Colino,S Costantini,B de la Cruz,S Cucciarelli, R de Asmundis,P Deglon,J Debreczeni, A Degre,K Dehmelt,K Deiters,D della Volpe,E Delmeire,P Denes,F DeNotaristefani,A De Salvo,M Diemoz,M Dierckxsens, C Dionisi,M Dittmar,A Doria,MT Dova,D Duchesneau,M Duda,B Echenard,A Eline,A El Hage,H El Mamouni, A Engler,FJ Eppling,P Extermann, MA Falagan,S Falciano,A Favara,J Fay,O Fedin,M Felcini,T Ferguson,H Fesefeldt,E Fiandrini,JH Field,F Filthaut,PH Fisher,W Fisher,I Fisk,G Forconi,K Freudenreich,C Furetta,Y Galaktionov,SN Ganguli, P Garcia-Abia,M Gataullin,S Gentile,S Giagu, ZF Gong,G Grenier,O Grimm,MW Gruenewald,M Guida,VK Gupta,A Gurtu,LJ Gutay,D Haas,D Hatzifotiadou,T Hebbeker,A Herve,J Hirschfelder,H Hofer,M Hohlmann,G Holzner, SR Hou, BN Jin,P Jindal, LW Jones,P de Jong,I Josa-Mutuberria,M Kaur,MN Kienzle-Focacci,JK Kim,J Kirkby,W Kittel,A Klimentov,AC Konig,M Kopal, V Koutsenko,M Kraber,RW Kraemer,A Kruger,A Kunin,PL de Guevara,I Laktineh,G Landi,M Lebeau,A Lebedev,P Lebrun,P Lecomte,P Lecoq,P Le Coultre,JM Le Goff,R Leiste,M Levtchenko,P Levtchenko,C Li,S Likhoded,CH Lin,WT Lin,FL Linde,L Lista,ZA Liu,W Lohmann,E Longo,YS Lu,C Luci,L Luminari,W Lustermann,WG Ma,L Malgeri,A Malinin,C Mana,J Mans,JP Martin, F Marzano,K Mazumdar,RR McNeil,S Mele,L Merola,M Meschini,WJ Metzger,A Mihul,H Milcent, G Mirabelli,J Mnich,GB Mohanty,GS Muanza,AJM Muijs,B Musicar,M Musy,S Nagy,S Natale,M Napolitano,F Nessi-Tedaldi,H Newman,A Nisati,T Novak,H Nowak,R Ofierzynski,G Organtini,I Pal,C Palomares,P Paolucci,R Paramatti,G Passaleva,S Patricelli,T Paul,M Pauluzzi,C Paus,F Pauss,M Pedace,S Pensotti,D Perret-Gallix,D Piccolo,F Pierella,M Pioppi,PA Piroue,E Pistolesi,V Plyaskin,M Pohl,V Pojidaev,J Pothier,D Prokofiev,G Rahal-Callot,MA Rahaman,P Raics,N Raja,R Ramelli,PG Rancoita,R Ranieri, A Raspereza,P Razis,D Ren,M Rescigno,S Reucroft,S Riemann,K Riles,BP Roe,L Romero,A Rosca,C Rosemann,C Rosenbleck,S Rosier-Lees,S Roth,JA Rubio,G Ruggiero,H Rykaczewski,A Sakharov,S Saremi,S Sarkar,J Salicio, E Sanchez,C Schafer,V Schegelsky,H Schopper,DJ Schotanus, C Sciacca,L Servoli,S Shevchenko,N Shivarov,V Shoutko,E Shumilov,A Shvorob,D Son,C Souga,P Spillantini,M Steuer,DP Stickland,B Stoyanov,A Straessner,K Sudhakar,G Sultanov,LZ Sun,S Sushkov, H Suter,JD Swain,Z Szillasi,XW Tang,P Tarjan,L Tauscher,L Taylor,B Tellili, D Teyssier,C Timmermans, SCC Ting, SM Ting,SC Tonwar,J Toth,C Tully,KL Tung,J Ulbricht,E Valente,RT Van de Walle,R Vasquez,V Veszpremi,G Vesztergombi, I Vetlitsky,G Viertel,S Villa,M Vivargent,S Vlachos,I Vodopianov,H Vogel,H Vogt,I Vorobiev,AA Vorobyov,M Wadhwa,Q Wang,XL Wang, ZM Wang,M Weber,S Wynhoff,L Xia,ZZ Xu,J Yamamoto, BZ Yang,CG Yang,HJ Yang, M Yang, SC Yeh,A Zalite,Y Zalite, ZP Zhang,J Zhao,GY Zhu,RY Zhu, HL Zhuang,A Zichichi,B Zimmermann,M Zoller

Physics letters B（2005）

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摘要

Exclusive rho+rho- production in two-photon collisions between a quasi-real photon, gamma, and a mid-virtuality photon, gamma*, is studied with data collected at LEP at centre-of-mass energies root(s)=183-209GeV with a total integrated luminosity of 684.8pb^-1. The cross section of the gamma gamma* -> rho+ rho- process is determined as a function of the photon virtuality, Q^2, and the two-photon centre-of-mass energy, W_gg, in the kinematic region: 0.2GeV^2 < Q^2 <0.85GeV^2 and 1.1GeV < W_gg < 3GeV. These results, together with previous L3 measurements of rho0 rho0 and rho+ rho- production, allow a study of the gamma gamma* -> rho rho process over the Q^2-region 0.2GeV^2 < Q^2 < 30 GeV^2.

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