Measurement of the cross section for open-beauty production in photon–photon collisions at LEP
P. AchardUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandO. AdrianiUniversity of Florence, Florence, ItalyM. Aguilar-BenitezCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainJ. Alcaraz MaestreCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainG. AlemanniUniversity of Lausanne, CH-1015 Lausanne, SwitzerlandJ. AllabyEuropean Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, SwitzerlandA. AloisioUniversity of Naples Federico II, Naples, ItalyM.G. AlviggiINFN, Sezione di Napoli and University of Naples, I-80125 Naples, ItalyH. AnderhubETH Zurich, Zurich, SwitzerlandV.P. AndreevLouisiana State University, Baton Rouge, LA 70803, USAF. AnselmoUniversity of Bologna, Bologna, ItalyA. ArefievInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaT. AzemoonUniversity of Michigan, Ann Arbor, MI 48109, USAT. AzizTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaP. BagnaiaINFN, Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyA. BajoINFN , Sezione di Napoli and University of Potenza , I-85100 Potenza , ItalyG. BaksayFlorida Institute of Technology, Melbourne, FL 32901, USAL. BaksayFlorida Institute of Technology, Melbourne, FL 32901, USAS.V. BaldewUniversity of Amsterdam, Amsterdam, NetherlandsSw. BanerjeeTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaA. Barczykz Florida Institute of Technology , Melbourne , FL 32901 , USAR. BarillèreEuropean Laboratory for Particle Physics , CERN , CH-1211 Geneva 23 , SwitzerlandP. Bartaliniw University of Lausanne , CH-1015 Lausanne , SwitzerlandM. BasileDepartment of Physics , National Tsing Hua University , Taiwan , Republic of ChinaN. BatalovaPurdue University West Lafayette, West Lafayette, United StatesR. BattistonINFN , Sezione di Perugia and Università Degli Studi di Perugia , I-06100 Perugia , ItalyA. Bayz Florida Institute of Technology , Melbourne , FL 32901 , USAF. BecattiniINFN , Sezione di Firenze and University of Florence , I-50125 Florence , ItalyU. BeckerMassachusetts Institute of Technology , Cambridge , MA 02139 , USAF. BehnerETH Zurich, Zurich, SwitzerlandL. BellucciUniversity of Florence, Florence, ItalyR. BerbecoUniversity of Michigan , Ann Arbor , MI 48109 , USAJ. BerdugoTata Institute of Fundamental Research, Mumbai (Bombay) 400 005, IndiaP. BergesMassachusetts Institute of Technology , Cambridge , MA 02139 , USAB. BertucciUniversity of Perugia, Perugia, ItalyB.L. BetevETH Zurich, Zurich, SwitzerlandM. BiasiniUniversity of Perugia, Perugia, ItalyM. BigliettiINFN , Sezione di Napoli and University of Naples , I-80125 Naples , ItalyA. BilandETH Zurich, Zurich, SwitzerlandJ.J. BlaisingLaboratoire d'Annecy-le-Vieux de Physique des Particules , LAPP , IN2P3-CNRS , BP 110 , F-74941 Annecy-le-Vieux cedex , FranceS.C. BlythCarnegie Mellon University , Pittsburgh , PA 15213 , USAG. J. BobbinkUniversity of Amsterdam, Amsterdam, NetherlandsA. BöhmIII. Physikalisches Institut , RWTH , D-52056 Aachen , GermanyL. BoldizsárCentral Research Institute for Physics of the Hungarian Academy of Sciences , H-1525 Budapest 114 , HungaryB. BorgiaSapienza University of Rome, Rome, ItalyS. BottaiUniversity of Florence, Florence, ItalyD. BourilkovarM. BourquinUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandS. BracciniUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandJ.G. BransonUniversity of California, San Diego, San Diego, United StatesF. BrochuInstitute for Theoretical and Experimental PhysicsJ. BürgerMassachusetts Institute of Technology , Cambridge , MA 02139 , USAW.J. BurgerUniversity of Perugia, Perugia, ItalyX.D. CaiMassachusetts Institute of Technology , Cambridge , MA 02139 , USAM. CapellMassachusetts Institute of Technology , Cambridge , MA 02139 , USAG. Cara RomeoUniversity of Bologna andG. CarlinoINFN , Sezione di Napoli and University of Naples , I-80125 Naples , ItalyA.M. CartacciUniversity of Florence, Florence, ItalyJ. CasausCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainF. CavallariSapienza University of Rome, Rome, ItalyN. CavalloUniversity of Basilicata, Potenza, ItalyC. CecchiUniversity of Perugia, Perugia, ItalyM. CerradaUniversity of Michigan, Ann Arbor, MI 48109, USAM. ChamizoUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandY. H. ChangNational Central University, Taoyuan City, TaiwanM. ChemarinInstitut de Physique Nucléaire de Lyon , IN2P3-CNRS , Université Claude Bernard , F-69622 Villeurbanne , FranceA. ChenNational Central University, Taoyuan City, TaiwanG. ChenInstitute of High Energy Physics , IHEP , 100039 Beijing , ChinaG.M. ChenInstitute of High Energy Physics , IHEP , 100039 Beijing , ChinaH.F. ChenUniversity of Science and Technology of China, Hefei, ChinaH.S. ChenInstitute of High Energy Physics , IHEP , 100039 Beijing , ChinaG. ChiefariUniversity of Naples Federico II, Naples, ItalyL. CifarelliUniversity of Salerno, Fisciano, ItalyF. CindoloUniversity of Bologna andI. ClareMassachusetts Institute of Technology , Cambridge , MA 02139 , USAR. ClareUniversity of California, Riverside, Riverside, United StatesG. CoignetFlorida Institute of Technology, Melbourne, FL 32901, USAN. ColinoCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainS. CostantiniSapienza University of Rome, Rome, ItalyB. De La CruzCentro de Investigaciones Energéticas , Medioambientales y Tecnológicas , CIEMAT , E-28040 Madrid , SpainS. CucciarelliINFN , Sezione di Perugia and Università Degli Studi di Perugia , I-06100 Perugia , ItalyR. de AsmundisUniversity of Naples Federico II, Naples, ItalyP. DéglonUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandJ. DebreczeniCentral Research Institute for Physics of the Hungarian Academy of Sciences , H-1525 Budapest 114 , HungaryA. DegréLaboratoire d'Annecy-le-Vieux de Physique des Particules , LAPP , IN2P3-CNRS , BP 110 , F-74941 Annecy-le-Vieux cedex , FranceK. Dehmeltao University of California , San Diego , CA 92093 , USAK. DeitersFlorida Institute of Technology, Melbourne, FL 32901, USAD. della VolpeINFN , Sezione di Napoli and University of Naples , I-80125 Naples , ItalyE. DelmeireUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandP. DenesPrinceton University, Princeton, United StatesF. DeNotaristefaniINFN , Sezione di Roma and University of Rome , "La Sapienza" , I-00185 Rome , ItalyA. De SalvoNational Central University , Chung-Li , Taiwan , Republic of ChinaM. DiemozINFN , Sezione di Roma and University of Rome , "La Sapienza" , I-00185 Rome , ItalyM. DierckxsensUniversity of Amsterdam, Amsterdam, NetherlandsC. DionisiSapienza University of Rome, Rome, ItalyM. DittmarETH Zurich, Zurich, SwitzerlandA. DoriaUniversity of Naples Federico II, Naples, ItalyM.T. DovaNortheastern University , Boston , MA 02115 , USAD. DuchesneauUniversity of Amsterdam
2005en
ABI
Аннотация
The cross section for open-beauty production in photon–photon collisions is measured using the whole high-energy and high-luminosity data sample collected by the L3 detector at LEP. This corresponds to 627 pb −1 of integrated luminosity for electron–positron centre-of-mass energies from 189 to 209 GeV. Events containing b quarks are identified through their semi-leptonic decay into electrons or muons . The e + e − → e + e − b b ¯ X cross section is measured within our fiducial volume and then extrapolated to the full phase space. These results are found to be in significant excess with respect to Monte Carlo predictions and next-to-leading order QCD calculations.
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