Observation of isolated high-ET photons in deep inelastic scattering
S. ChekanovArgonne National Laboratory , Argonne , IL 60439-4815 , USAM. DerrickNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)J.H. LoizidesArgonne National Laboratory , Argonne , IL 60439-4815 , USAS. MagillArgonne National Laboratory , Argonne , IL 60439-4815 , USAS. MiglioranziArgonne National Laboratory , Argonne , IL 60439-4815 , USAB. MusgraveArgonne National Laboratory , Argonne , IL 60439-4815 , USAJ. RepondNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)R. YoshidaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)M.C.K. MattinglyAndrews University, Berrien Springs, MI 49104-0380, USAN. PavelNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)P. AntonioliUniversity andG. BariŁódź University , PolandM. BasileUniversity andL. BellagambaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)D. BoscheriniInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyA. BruniINFN Bologna , Bologna , ItalyG. BruniNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)G. Cara RomeoUniversity andL. CifarelliUniversity andF. CindoloUniversity andA. ContinInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyM. CorradiNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)S. De PasqualeNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)P. GiustiUniversity andG. IacobucciUniversity andA. MargottiA. MontanariInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyR. NaniaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)F. PalmonariINFN Bologna , Bologna , ItalyA. PesciINFN Bologna , Bologna , ItalyL. RinaldiUniversity andG. SartorelliUniversity andA. ZichichiINFN Bologna , Bologna , ItalyG. AghuzumtsyanUniversity andD. BartschUniversity andI. BrockUniversity andS. GoersNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)H. HartmannNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)E. HilgerINFN Bologna , Bologna , ItalyP. IrrgangNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)H.‐P. JakobO. KindUniversity andU. MeyerE. PaulUniversity andJ. RautenbergNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)R. RennerNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)A. StifutkinINFN Bologna , Bologna , ItalyJ. TandlerUniversity andK.C. VossPhysikalisches Institut der Universität Bonn , Bonn , GermanyMeng WangNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)DS BaileyN. H. BrookJ. E. ColePhysikalisches Institut der Universität Bonn , Bonn , GermanyG.P. HeathPhysikalisches Institut der Universität Bonn , Bonn , GermanyT. NamsooNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)S. RobinsNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)M. WingPhysics Laboratory , University of Bristol , Bristol , United KingdomM. CapuaPhysics Department , Calabria University , and INFN , Cosenza , ItalyA. MastroberardinoPhysics Department , Calabria University , and INFN , Cosenza , ItalyM. SchioppaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)G. SusinnoNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)J.Y. KimChonnam National University , Kwangju , South KoreaI. T. LimChonnam National University , Kwangju , South KoreaK.J. MaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)M.Y. PacPhysics Department , Calabria University , and INFN , Cosenza , ItalyM. HelbichNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USANing YeAndrews University, Berrien Springs, MI 49104-0380, USAZ. RenNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAW.B. SchmidkeNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAF. SciulliNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAJ. J. ChwastowskiInstitute of Nuclear Physics , Cracow , PolandA. EskreysInstitute of Nuclear Physics , Cracow , PolandJ. FigielInstitute of Nuclear Physics , Cracow , PolandA. GalasInstitute of Nuclear Physics , Cracow , PolandK. OlkiewiczNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)P. StopaNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAL. ZawiejskiNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)L. AdamczykInstitute of Nuclear Physics , Cracow , PolandT. BołdNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)I. Grabowska-BołdNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)D. KisielewskaInstitute of Nuclear Physics , Cracow , PolandA.M. KowalInstitute of Nuclear Physics , Cracow , PolandM. KowalNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)J. ŁukasikFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandM. PrzybycieńNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)L. SuszyckiAGH University of KrakowD. SzubaFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandJ. SzubaFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandA. KotańskiAGH University of KrakowW. SłomińskiNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)V. AdlerArgonne National Laboratory, Argonne, IL 60439-4815, USA4040Supported by the US Department of EnergyU. BehrensDepartment of Physics , Jagellonian University , Cracow , PolandI. BlochNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)K. BorrasDepartment of Physics , Jagellonian University , Cracow , PolandV. ChiochiaDepartment of Physics , Jagellonian University , Cracow , PolandD. DannheimDepartment of Physics , Jagellonian University , Cracow , PolandG. DrewsNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)J. FourletovaNIKHEF and University of Amsterdam, Amsterdam, Netherlands3434Supported by the Netherlands Foundation for Research on Matter (FOM)U. FrickeDepartment of Physics , Jagellonian University , Cracow , PolandA. GeiserDepartment of Physics , Jagellonian University , Cracow , Poland
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Annotatsiya
First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron–proton collider using an integrated luminosity of 121 pb−1. A signal for isolated photons in the transverse energy and rapidity ranges 5 35GeV2. Cross sections are presented for inclusive prompt photons and for those accompanied by a single jet in the range ETjet⩾6GeV and −1.5⩽ηjet<1.8. Calculations at order α3αs describe the data reasonably well.
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