Observation of direct processes in photoproduction at HERA
M. DerrickArgonne National Laboratory , Argonne , IL , USAD. KrakauerArgonne National Laboratory , Argonne , IL , USAS. MagillArgonne National Laboratory , Argonne , IL , USAB. MusgraveArgonne National Laboratory , Argonne , IL , USAJ. RepondArgonne National Laboratory , Argonne , IL , USAS. RepondArgonne National Laboratory , Argonne , IL , USAR. StanekArgonne National Laboratory , Argonne , IL , USAR. L. TalagaArgonne National Laboratory , Argonne , IL , USAJ. ThronArgonne National Laboratory , Argonne , IL , USAF. ArzarelloR. AyadSupported by Worldlab , Lausanne , SwitzerlandG. BariArgonne National Laboratory , Argonne , IL , USAM. BasileArgonne National Laboratory , Argonne , IL , USAL. BellagambaArgonne National Laboratory , Argonne , IL , USAD. BoscheriniArgonne National Laboratory , Argonne , IL , USAA. BruniArgonne National Laboratory , Argonne , IL , USAG. BruniArgonne National Laboratory , Argonne , IL , USAP. BruniG. Cara RomeoArgonne National Laboratory , Argonne , IL , USAG. CastelliniAlso at IROE Florence , ItalyM. ChiariniArgonne National Laboratory , Argonne , IL , USAL. CifarelliNow at Univ. of Pisa , ItalyF. CindoloArgonne National Laboratory , Argonne , IL , USAF. CiralliArgonne National Laboratory , Argonne , IL , USAA. ContinC. Del PapaS. D’AuriaINFN Bologna , Bologna , ItalyF. FrasconiINFN Bologna , Bologna , ItalyP. GiustiINFN Bologna , Bologna , ItalyG. IacobucciArgonne National Laboratory , Argonne , IL , USAG. LaurentiArgonne National Laboratory , Argonne , IL , USAG. LéviArgonne National Laboratory , Argonne , IL , USAQing-Yong LinG. MaccarroneA. MargottiINFN Bologna , Bologna , ItalyT. MassamINFN Bologna , Bologna , ItalyR. NaniaINFN Bologna , Bologna , ItalyC. NemozINFN Bologna , Bologna , ItalyF. PalmonariINFN Bologna , Bologna , ItalyG. SartorelliR. TimelliniINFN Bologna , Bologna , ItalyY. Zamora GarciaA. ZichichiINFN Bologna , Bologna , ItalyA. BargendeUniversity andJ. CrittendenUniversity of Bonn, Bonn, GermanyK. DeschUniversity of Bonn, Bonn, GermanyB. DiekmannPhysikalisches Institut der Universitiit Bonn , Bonn , FRGT. DoekerUniversity of Bonn, Bonn, GermanyL. FeldUniversity of Bonn, Bonn, GermanyA. FreyUniversity of Bonn, Bonn, GermanyM. GeertsUniversity of Bonn, Bonn, GermanyG. GeitzUniversity of TurinH. HartmannUniversity andDaniel B. M. HaunINFN Bologna , Bologna , ItalyK. HéinlothPhysikalisches Institut der Universitiit Bonn , Bonn , FRGE. HilgerUniversity of Bonn, Bonn, GermanyH.‐P. JakobUniversity of Bonn, Bonn, GermanyU. KatzUniversity of Bonn, Bonn, GermanyS. KramarczykNow a self-employed consultantM. KückesUniversity of Bonn, Bonn, GermanyA. MassPhysikalisches Institut der Universitiit Bonn , Bonn , FRGS. MengelPhysikalisches Institut der Universitiit Bonn , Bonn , FRGJ. MollenAzienda Sanitaria Locale AlessandriaH. MüschUniversity of Bonn, Bonn, GermanyE. PaulPhysics Laboratory , University of Bristol , Bristol , UKR. SchattevoyUniversity andJ.-L. SchneiderPhysikalisches Institut der Universitiit Bonn , Bonn , FRGD. SchrammPhysikalisches Institut der Universitiit Bonn , Bonn , FRGR. WedemeyerPhysikalisches Institut der Universitiit Bonn , Bonn , FRGA. CassidyUniversity andD. CussansUniversity of Bristol, Bristol, United KingdomN. DycePhysikalisches Institut der Universitiit Bonn , Bonn , FRGB. FosterPhysics Laboratory , University of Bristol , Bristol , UKS. GeorgePhysics Laboratory , University of Bristol , Bristol , UKR. GilmorePhysics Laboratory , University of Bristol , Bristol , UKG.P. HeathFaculty of Sciences , Torino University and INFN-Alessandria , ItalyH. F. HeathPhysics Laboratory , University of Bristol , Bristol , UKM. LancasterUniversity andT.J. LlewellynPhysikalisches Institut der Universitiit Bonn , Bonn , FRGC.J.S. MorgadoPhysics Laboratory , University of Bristol , Bristol , UKJ.A. O'MaraPhysics Laboratory , University of Bristol , Bristol , UKR.J. TapperPhysics Laboratory , University of Bristol , Bristol , UKStephen WilsonPhysics Laboratory , University of Bristol , Bristol , UKR. YoshidaUniversity of Bristol, Bristol, United KingdomR. R. RauBrookhaven National Laboratory , Upton , LL USAM. ArneodoUniversity of Calabria, Rende, ItalyM. SchioppaUniversity of Calabria, Rende, ItalyG. SusinnoCalabria University , Physics Dept. and INFN , Cosenza , ItalyA. BernsteinColumbia University, New York, United StatesA. CaldwellColumbia University, New York, United StatesI. GialasColumbia University, New York, United StatesJ. A. ParsonsColumbia University, New York, United StatesS. RitzColumbia University, New York, United StatesF. SciulliColumbia University, New York, United StatesP.B. StraubFaculty of Physics and Nuclear Techniques , Academy of Mining and Metallurgy , Cracow , PolandL. WaiColumbia University, New York, United StatesS. YangColumbia University, New York, United StatesP. BorzemskiInst. of Nuclear Physics , Cracow , PolandJ. J. ChwastowskiPolish Academy of Sciences, Warsaw, PolandA. EskreysColumbia University , Nevis Labs. , Irvington on Hudson , NY , USA
1994en
ABI
Annotatsiya
Jets in photoproduction events have been studied with the ZEUS detector for γp centre-of-mass energies ranging from 130 to 250 GeV. The inclusive jet distributions give evidence for the dominance of resolved photon interactions. In the di-jet sample the direct processes are for the first time clearly isolated. Di-jet cross sections for the resolved and direct processes are given in a restricted kinematic range.
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