Lambda And Sigma(0) Pair Production In Two-Photon Collisions 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 , Sv Baldew , S Banerjee , 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 , Ja Van Dalen , R De Asmundis , P Deglon , J Debreczeni , A Degre , 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 , B Echenard , A Eline , H El Mamouni , A Engler , Fj Eppling , A Ewers , 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 , R Van Gulik , Vk Gupta , A Gurtu , Lj Gutay , D Haas , Rs Hakobyan , D Hatzifotiadou , T Hebbeker , A Herve , J Hirschfelder , H Hofer , M Hohlmann , G Holzner , Sr Hou , Y Hu , Bn Jin , Lw Jones , P De Jong , I Josa-Mutuberria , D Kafer , M Kaur , Mn Kienzle-Focacci , Jk Kim , J Kirkby , W Kittel , A Klimentov , Ac Konig , M Kopal , V Koutsenko , M Kraber , Rw Kraemer , W Krenz , 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 , K Lubelsmeyer , C Luci , L Luminari , W Lustermann , Wg Ma , L Malgeri , A Malinin , C Mana , D Mangeol , 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 , 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 , Pa Piroue , E Pistolesi , V Plyaskin , M Pohl , V Pojidaev , J Pothier , Do Prokofiev , D Prokofiev , J Quartieri , 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 , S Rosier-Lees , S Roth , C Rosenbleck , B Roux , Ja Rubio , G Ruggiero , H Rykaczewski , A Sakharov , S Saremi , S Sarkar , J Salicio , E Sanchez , Mp Sanders , C Schafer , V Schegelsky , S Schmidt-Kaerst , D Schmitz , H Schopper , Dj 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 , 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 , V Veszpremi , G Vesztergombi , I Vetlitsky , D Vicinanza , G Viertel , S Villa , M Vivargent , S Vlachos , I Vodopianov , H Vogel , H Vogt , I Vorobiev , Aa Vorobyov , M Wadhwa , W Wallraff , Xl Wang , Zm Wang , M Weber , P Wienemann , H Wilkens , 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 , G Zilizi , B Zimmermann , M Zoller PHYSICS LETTERS B（2002）
Abstract
Strange baryon pair production in two-photon collisions is studied with the L3 detector at LEP. The analysis is based on data collected at e(+)e(-) centre-of-mass energies from 91 GeV to 208 GeV, corresponding to an integrated luminosity of 844 pb(-1). The processes gammagamma --> Lambda(Lambda) over bar and gammagamma --> Sigma(o)(Sigma) over bar (o) are identified. Their cross sections as a function of the gammagamma centre-of-mass energy are measured and results are compared to predictions of the quark-diquark model. (C) 2002 Published by Elsevier Science B.V.
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