Study of the photon remnant in resolved photoproduction at HERA
M. DerrickUniversity of Manitoba , Dept. of Physics , Winnipeg , Manitoba , Canadax3D. KrakauerArgonne Nutional Laboratory , Argonne , IL , lJSA4"S. MagillArgonne Nutional Laboratory , Argonne , IL , lJSA4"D. MikunasArgonne Nutional Laboratory , Argonne , IL , lJSA4"B. MusgraveArgonne Nutional Laboratory , Argonne , IL , lJSA4"J. RepondArgonne Nutional Laboratory , Argonne , IL , lJSA4"R. StanekArgonne Nutional Laboratory , Argonne , IL , lJSA4"R. L. TalagaArgonne Nutional Laboratory , Argonne , IL , lJSA4"H ZhangArgonne Nutional Laboratory , Argonne , IL , lJSA4"R. AyadUniversity and lNFN Bologna , Bologna , ItalyG. BariUniversity and lNFN Bologna , Bologna , ItalyM. BasileArgonne Nutional Laboratory , Argonne , IL , lJSA4"L. BellagambaArgonne Nutional Laboratory , Argonne , IL , lJSA4"D. BoscheriniArgonne Nutional Laboratory , Argonne , IL , lJSA4"A. BruniArgonne Nutional Laboratory , Argonne , IL , lJSA4"G. BruniArgonne Nutional Laboratory , Argonne , IL , lJSA4"P. BruniArgonne Nutional Laboratory , Argonne , IL , lJSA4"G. Cara RomeoUniversity of BolognaG. CastelliniM. ChiariniArgonne Nutional Laboratory , Argonne , IL , lJSA4"L. CifarelliF. CindoloArgonne Nutional Laboratory , Argonne , IL , lJSA4"A. ContinArgonne Nutional Laboratory , Argonne , IL , lJSA4"M. CorradiUniversity and lNFN Bologna , Bologna , ItalyI. GialasP. GiustiUniversity of BolognaG. IacobucciUniversity and lNFN Bologna , Bologna , ItalyG. LaurentiArgonne Nutional Laboratory , Argonne , IL , lJSA4"G. LéviArgonne Nutional Laboratory , Argonne , IL , lJSA4"A. MargottiArgonne Nutional Laboratory , Argonne , IL , lJSA4"T. MassamUniversity and lNFN Bologna , Bologna , ItalyR. NaniaUniversity of BolognaC. NemozUniversity of BolognaF. PalmonariUniversity of BolognaA. PoliniUniversity of BolognaG. SartorelliUniversity of BolognaR. TimelliniArgonne Nutional Laboratory , Argonne , IL , lJSA4"Y. Zamora GarciaA. ZichichiUniversity and lNFN Bologna , Bologna , ItalyA. BargendeJ. CrittendenUniversity of BolognaK. DeschUniversity and lNFN Bologna , Bologna , ItalyB. DiekmannT. DoekerUniversity and lNFN Bologna , Bologna , ItalyM. EckertUniversity of BolognaL. FeldUniversity of BolognaA. FreyUniversity of BolognaM. GeertsUniversity of BolognaG. Geitz?Jrino. Dipartimento di Fisicu Sperimentale and INFN, %ino, Italy3'M. GrotheUniversity and lNFN Bologna , Bologna , ItalyT. HaasUniversity and lNFN Bologna , Bologna , ItalyH. HartmannUniversity and lNFN Bologna , Bologna , ItalyK. HéinlothPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sE. HilgerPhysics Laboratory University of Bristol , Bristol , UK4 'H.‐P. JakobPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sU. KatzPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sS. M. MariPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sA. MassPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sS. MengelPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sJ. MollenPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sE. PaulPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sCh. RembserD. SchrammJ. StammR. WedemeyerS. Campbell-RobsonBrookhaven CollegeA. CassidyBrookhaven Nutional LaboratoryN. DycePhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sB. FosterPhysikalisches Institut der Universitiit Bonn , Bonn , Germany3sS. GeorgePhysics Laboratory University of Bristol , Bristol , UK4 'R. GilmorePhysics Laboratory University of Bristol , Bristol , UK4 'G.P HeathPhysics Laboratory University of Bristol , Bristol , UK4 'H. F. HeathBrookhaven Nutional LaboratoryT.J. LlewellynBrookhaven Nutional LaboratoryC.J.S. MorgadoBrookhaven CollegeD. NormanPhysics Laboratory University of Bristol , Bristol , UK4 'J.A. O'MaraPhysics Laboratory University of Bristol , Bristol , UK4 'R.J. TapperPhysics Laboratory University of Bristol , Bristol , UK4 'Stephen WilsonBrookhaven Nutional LaboratoryR. YoshidaPhysics Laboratory University of Bristol , Bristol , UK4 'R. R. RauBrookhaven Nutional LaboratoryM. ArneodoL. IannottiM. SchioppaG. SusinnoA. BernsteinColumbia University. Nevis Labs. ,A. CaldwellColumbia University. Nevis Labs. ,N. CartigliaColumbia University. Nevis Labs. ,J. A. ParsonsCulabria University , Physics Dept. and INFN. Cosenza , Italy XJS. RitzF. SciulliCulabria University , Physics Dept. and INFN. Cosenza , Italy XJP.B. StraubCulabria University , Physics Dept. and INFN. Cosenza , Italy XJL. WaiColumbia University. Nevis Labs. ,S. YangColumbia University. Nevis Labs. ,Q. M. ZhuCulabria University , Physics Dept. and INFN. Cosenza , Italy XJP. BorzemskiJ. J. ChwastowskiColumbia University. Nevis Labs. ,A. EskreysColumbia University. Nevis Labs. ,K. PiotrzkowskiInst. of Nuclear Physics , Cracow , PolandM. ZacharaCulabria University , Physics Dept. and INFN. Cosenza , Italy XJ
1995en
ABI
Abstract
Photoproduction at HERA is studied in ep collisions, with the ZEUS detector, for γp centre-of-mass energies ranging from 130–270 GeV. A sample of events with two high- p T jets ( p T > 6 GeV, η < 1.6) and a third cluster in the approximate direction of the electron beam is isolated using a clustering algorithm. These events are mostly due to resolved photoproduction. The third cluster is identified as the photon remnant. Its properties, such as the transverse and longitudinal energy flows around the axis of the cluster, are consistent with those commonly attributed to jets, and in particular with those found for the two jets in these events. The mean value of the photon remnant p T with respect to the beam axis is measured to be 2.1 ± 0.2 GeV, which demonstrates substantial mean transverse momenta for the photon remnant.
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Citations and references
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