DIFFRACTIVE HARD PHOTOPRODUCTION AT HERA AND EVIDENCE FOR THE GLUON CONTENT OF THE POMERON

Authors
DERRICK M KRAKAUER D MAGILL S MIKUNAS D MUSGRAVE B REPOND J STANEK R TALAGA RL ZHANG H AYAD R BARI G BASILE M BELLAGAMBA L BOSCHERINI D BRUNI A BRUNI G BRUNI P ROMEO GC CASTELLINI G CHIARINI M CIFARELLI L CINDOLO F CONTIN A CORRADI M GIALAS I GIUSTI P IACOBUCCI G LAURENTI G LEVI G MARGOTTI A MASSAM T NANIA R NEMOZ C PALMONARI F POLINI A SARTORELLI G TIMELLINI R GARCIA YZ ZICHICHI A BARGENDE A CRITTENDEN J DESCH K DIEKMANN B DOEKER T ECKERT M FELD L FREY A GEERTS M GROTHE M HARTMANN H HEINLOTH K HILGER E JAKOB HP KATZ UF MARI SM MENGEL S MOLLEN J PAUL E PFEIFFER M REMBSER C SCHRAMM D STAMM J WEDEMEYER R CAMPBELLROBSON S CASSIDY A DYCE N FOSTER B GEORGE S GILMORE R HEATH GP HEATH HF LLEWELLYN TJ MORGADO CJS NORMAN DJP OMARA JA TAPPER R WILSON SS YOSHIDA R RAU RR ARNEODO M CAPUA M GARFAGNINI A IANNOTTI L SCHIOPPA M SUSINNO G BERNSTEIN A CALDWELL A CARTIGLIA N PARSONS JA RITZ S SCIULLI F STRAUB PB WAI L YANG S ZHU Q BORZEMSKI P CHWASTOWSKI J ESKREYS A PIOTRZKOWSKI K ZACHARA M ZAWIEJSKI L ADAMCZYK L BEDNAREK B JELEN K KISIELEWSKA D KOWALSKI T RULIKOWSKAZAREBSKA E SUSZYCKI L ZAJAC J KOTANSKI A PRZYBYCIEN M BAUERDICK LAT BEHRENS U BEIER H BIENLEIN JK COLDEWEY C DEPPE O DESLER K DREWS G FLASINSKI M GILKINSON DJ GLASMAN C GOTTLICHER P GROSSEKNETTER J GUTJAHR B HAAS T HAIN W HASELL D HESSLING H IGA Y JOHNSON K JOOS P KASEMANN M KLANNER R KOCH W KOPKE L KOTZ U KOWALSKI H LABS J LADAGE A LOHR B LOWE M LUKE D MAINUSCH J MANCZAK O MONTEIRO T NG JST NICKEL S NOTZ D OHRENBERG K ROCO M ROHDE M ROLDAN J SCHNEEKLOTH U SCHULZ D SCHULZ W SELONKE F STILIARIS E SURROW B VOSS T WESTPHAL D WOLF G YOUNGMAN C ZEUNER W ZHOU JF GRABOSCH HJ KHARCHILAVA A LEICH A MATTINGLY MCK MEYER A SCHLENSTEDT S WULFF N BARBAGLI G PELFER P ANZIVINO G MACCARRONE G DEPASQUALE S VOTANO L BAMBERGER A EISENHARDT S FREIDHOF A SOLDNERREMBOLD S SCHROEDER J TREFZGER T BROOK NH BUSSEY PJ DOYLE AT FLECK JI SAXON DH UTLEY ML WILSON AS DANNEMANN A HOLM U HORSTMANN D NEUMANN T SINKUS R WICK K BADURA E BUROW BD HAGGE L LOHRMANN E MILEWSKI J NAKAHATA M PAVEL N POELZ G SCHOTT W ZETSCHE F BACON TC BRUEMMER N BUTTERWORTH I GALLO E HARRIS VL HUNG VL LONG KR MILLER DB MORAWITZ PPO PRINIAS A SEDGBEER JK WHITFIELD AF MALLIK U MCCLIMENT E WANG MZ WANG SM WU JT CLOTH P FILGES D AN SH HONG SM NAM SW PARK SK SUH MH YON SH IMLAY R KARTIK S KIM HJ MCNEILL RR METCALF W NADENDLA VK BARREIRO F CASES G FERNANDEZ JP GRACIANI R HERNANDEZ JM HERVAS L LABARGA L MARTINEZ M DELPESO J PUGA J TERRON J DETROCONIZ JF SMITH GR CORRIVEAU F HANNA DS HARTMANN J HUNG LW LIM JN MATTHEWS CG PATEL PM SINCLAIR LE STAIRS DG LAURENT MS ULLMANN R ZACEK G BASHKIROV V DOLGOSHEIN BA STIFUTKIN A BASHINDZHAGYAN GL ERMOLOV PF GLADILIN LK GOLUBKOV YA KOBRIN VD KORZHAVINA IA KUZMIN VA LUKINA OY PROSKURYAKOV AS SAVIN AA SHCHEGLOVA LM SOLOMIN AN ZOTOV NP BOTJE M CHLEBANA F DAKE A ENGELEN J DEKAMPS M KOOIJMAN P KRUSE A TIECKE H VERKERKE W VREESWIJK M WIGGERS L DEWOLF E VANWOUDENBERG R ACOSTA D BYLSMA B DURKIN LS HONSCHEID K LI C LING TY MCLEAN KW MURRAY WN PARK IH ROMANOWSKI TA SEIDLEIN R BAILEY DS BYRNE A CASHMORE RJ COOPERSARKAR AM DEVENISH RCE HARNEW N LANCASTER M LINDEMANN L MCFALL JD NATH C NOYES VA QUADT A TICKNER JR UIJTERWAAL H WALCZAK R WATERS DS WILSON FF YIP T ABBIENDI G BERTOLIN A BRUGNERA R CARLIN R DALCORSO F DEGIORGI M DOSSELLI U LIMENTANI S MORANDIN M POSOCCO M STANCO L STROILI R VOCI C BULMAHN J BUTTERWORTH JM FEILD RG OH BY WHITMORE JJ DAGOSTINI G MARINI G NIGRO A TASSI E HART JC MCCUBBIN NA PRYTZ K SHAH TP SHORT TL BARBERIS E DUBBS T HEUSCH C VANHOOK M LOCKMAN W RAHN JT SADROZINSKI HFW SEIDEN A WILLIAMS DC BILTZINGER J SEIFERT RJ SCHWARZER O WALENTA AH ZECH G ABRAMOWICZ H BRISKIN G DAGAN S LEVY A HASEGAWA T HAZUMI M ISHII T KUZE M MINE S NAGASAWA Y NAKAO M SUZUKI I TOKUSHUKU K YAMADA S YAMAZAKI Y CHIBA M HAMATSU R HIROSE T HOMMA K KITAMURA S NAKAMITSU Y YAMAUCHI K CIRIO R COSTA M FERRERO MI LAMBERTI L MASELLI S PERONI C SACCHI R SOLANO A STAIANO A DARBO M BAILEY DC BANDYOPADHYAY D BENARD F BRKIC M CROMBIE MB GINGRICH DM HARTNER GF JOO KK LEVMAN GM MARTIN JF ORR RS POLENZ S SAMPSON CR TEUSCHER RJ CATTERALL CD JONES TW KAZIEWICZ PB LANE JB SAUNDERS RL SHULMAN J BLANKENSHIP K LU B MO LW BOGUSZ W CHARCHULA K CIBOROWSKI J GAJEWSKI J GRZELAK G KASPRZAK M KRZYZANOWSKI M MUCHOROWSKI K NOWAK RJ PAWLAK JM TYMIENIECKA T WROBLEWSKI AK ZAKRZEWSKI JA ZARNECKI AF ADAMUS M EISENBERG Y KARSHON U REVEL D ZERZION D ALI I BADGETT WF BEHRENS B DASU S FORDHAM C FOUDAS C GOUSSIOU A LOVELESS RJ REEDER DD SILVERSTEIN S SMITH WH VAICIULIS A WODARCZYK M TSURUGAI T BHADRA S CARDY ML FAGERSTROEM CP FRISKEN WR FURUTANI KM KHAKZAD M SCHMIDKE WB
Citation
M. Derrick et al., DIFFRACTIVE HARD PHOTOPRODUCTION AT HERA AND EVIDENCE FOR THE GLUON CONTENT OF THE POMERON, Physics letters. Section B, 356(1), 1995, pp. 129-146
Citations number
54
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
356
Issue
1
Year of publication
1995
Pages
129 - 146
Database
ISI
SICI code
0370-2693(1995)356:1<129:DHPAHA>2.0.ZU;2-D
Abstract
Inclusive jet cross sections for events with a large rapidity gap with respect to the proton direction from the reaction ep --> jet + X with quasi-real photons have been measured with the ZEUS detector. The cro ss sections refer to jets with transverse energies E(T)(jet) > 8 GeV, The data show the characteristics of a diffractive process mediated by pomeron exchange. Assuming that the events are due to the exchange of a pomeron with partonic structure, the quark and gluon content of the pomeron is probed at a scale similar to (E(T)(jet))(2). A comparison of the measurements with model predictions based on QCD plus Regge phe nomenology requires a contribution of partons with a hard momentum den sity in the pomeron. A combined analysis of the jet cross sections and recent ZEUS measurements of the diffractive structure function in dee p inelastic scattering gives the first experimental evidence for the g luon content of the pomeron in diffractive hard scattering processes. The data indicate that between 30% and 80% of the momentum of the pome ron carried by partons is due to hard gluons.