Measurement of exclusive ρ+ρ−ρ+ρ− production in mid-virtuality two-photon interactions and study of the γγ∗→ρργγ∗→ρρ process at LEP

P Achard,O Adriani, M Aguilarbenitez,J Alcaraz,G Alemanni,J Allaby, A Aloisio, M G Alviggi,H Anderhub, V Andreev,F Anselmo, A Arefiev,T Azemoon,T Aziz, P Bagnaia,A Bajo,G Baksay,L Baksay,S V Baldew,Sw 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, B L Betev, M Biasini, M Biglietti,A Biland,J J Blaising,S Blyth, G J Bobbink,A Bohm, L Boldizsar,B Borgia,S Bottai,D Bourilkov,M Bourquin,S Braccini, J G Branson, F M Brochu,J D Burger,W J Burger,X D Cai,M Capell,G Cara Romeo,G Carlino,A M Cartacci,J Casaus,F Cavallari, N Cavallo,C Cecchi, M Cerrada,M Chamizo,Y H Chang,M Chemarin,A Chen, G M 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,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,M T Dova,D Duchesneau,M Duda, B Echenard,A Eline,A El Hage,H El Mamouni, A Engler, F J Eppling,P Extermann,M A Falagan,S Falciano,A Favara, J Fay, O L 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 Garciaabia, M Gataullin,S Gentile,S Giagu,Z F Gong,G Grenier,O Grimm, M W Gruenewald,M Guida, V K Gupta, A Gurtu, L J Gutay,D Haas,D Hatzifotiadou, T Hebbeker,A Herve,J Hirschfelder, H Hofer, M Hohlmann,G Holzner,S R Hou,B N Jin, P Jindal,L W Jones,P De Jong,I Josamutuberria,M Kaur,M N Kienzlefocacci,J K Kim,J Kirkby,W Kittel,A Klimentov,A C Konig,M Kopal,V Koutsenko,M Kraber,R W Kraemer,A Kruger,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,M Levtchenko,P Levtchenko,C Li,S Likhoded,C H Lin,W T Lin, F L Linde,L Lista, Z A Liu,W Lohmann,Egidio Longo,Y S Lu, C Luci, L Luminari, W Lustermann, W G Ma,L Malgeri,A Malinin,C Mana, 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 Nessitedaldi, H B Newman, A Nisati,T Novak,H Nowak, R A 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 Perretgallix, D Piccolo,F Pierella, M Pioppi,P A Piroue,E Pistolesi,V Plyaskin, M Pohl,V Pojidaev,J Pothier,D Prokofiev,G Rahalcallot,M A Rahaman, P Raics, N Raja,R Ramelli,P G Rancoita, R Ranieri, A Raspereza,P A Razis,D Ren, M Rescigno, S Reucroft,S Riemann,K Riles,B P Roe,Luciano Romero,A Rosca,C Rosemann,C Rosenbleck,S Rosierlees,S Roth,J A Rubio,G Ruggiero,H Rykaczewski, Alexandre Sakharov,S Saremi,S Sarkar,J Salicio,E Sanchez,Christoph Schafer,V A Schegelsky, H Schopper,D J Schotanus,C Sciacca,L Servoli,S Shevchenko,N Shivarov,V Shoutko,E Shumilov,A Shvorob,D Son,C Souga,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,Lucas Taylor,B Tellili, D Teyssier,C Timmermans,Samuel C C Ting, S C Tonwar, J Toth,C Tully,K L Tung,J Ulbricht,E Valente,R T 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,A A Vorobyov,M Wadhwa,Qiang Wang, X L Wang,Z M Wang, M Weber,S Wynhoff,L Xia,Z Z Xu,J Yamamoto,B Z Yang,C G Yang,H J Yang, Minghsuan Yang, S C Yeh,An Zalite,Yu Zalite, Z P Zhang,J Zhao,G Y Zhu,R Y Zhu,H L Zhuang, A Zichichi,B Zimmermann,M Zoller

Physics Letters B（2005）

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摘要

Exclusive ρ+ρ− production in two-photon collisions between a quasi-real photon, γ, and a mid-virtuality photon, γ∗, is studied with data collected at LEP at centre-of-mass energies 183GeV⩽s⩽209GeV with a total integrated luminosity of 684.8pb−1. The cross section of the γγ∗→ρ+ρ− process is determined as a function of the photon virtuality, Q2, and the two-photon centre-of-mass energy, Wγγ, in the kinematic region: 0.2GeV2⩽Q2⩽0.85GeV2 and 1.1GeV⩽Wγγ⩽3GeV. These results, together with previous L3 measurements of ρ0ρ0 and ρ+ρ− production, allow a study of the γγ∗→ρρ process over the Q2-region 0.2GeV2⩽Q2⩽30GeV2.

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关键词

Luminosity (scattering theory),Photon,Nuclear physics,Particle physics,Physics,Production (computer science),Near threshold

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