OBSERVATION OF HARD SCATTERING IN PHOTOPRODUCTION EVENTS WITH A LARGERAPIDITY GAP AT HERA

Authors
DERRICK M KRAKAUER D MAGILL S MUSGRAVE B REPOND J SCHLERETH J STANEK R TALAGA RL THRON J ARZARELLO F 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 CIRALLI F CONTIN A DAURIA S FRASCONI F 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 GEITZ G GROTHE M HARTMANN H HAUN D HEINLOTH K HILGER E JAKOB HP KATZ UF MARI SM MASS A MENGEL S MOLLEN J PAUL E REMBSER C SCHATTEVOY R 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 RJ WILSON SS YOSHIDA R RAU RR ARNEODO M IANNOTTI L SCHIOPPA M SUSINNO G BERNSTEIN A CALDWELL A 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 ESKREYS K JELEN K KISIELEWSKA D KOWALSKI T RULIKOWSKAZAREBSKA E SUSZYCKI L ZAJAC J KOTANSKI A PRZYBYCIEN M BAUERDICK LAT BEHRENS U BIENLEIN JK BOTTCHER S COLDEWEY C DREWS G FLASINSKI M GILKINSON DJ GOTTLICHER P GUTJAHR B HAAS T HAIN W HASELL D HESSLING H HULTSCHIG H IGA Y JOOS P KASEMANN M KLANNER R KOCH W KOPKE L KOTZ U KOWALSKI H KROGER W KRUGER J LABS J LADAGE A LOHR B LOWE M LUKE D MANCZAK O NG JST NICKEL S NOTZ D OHRENBERG K ROCO M ROHDE M ROLDAN J SCHNEEKLOTH U SCHULZ W SELONKE F STILIARIS E VOSS T WESTPHAL D WOLF G YOUNGMAN C GRABOSCH HJ LEICH A MEYER A RETHFELDT C SCHLENSTEDT S BARBAGLI G PELFER P ANZIVINO G MACCARRONE G DEPASQUALE S QIAN S VOTANO L BAMBERGER A FREIDHOF A POSER T SOLDNERREMBOLD S SCHROEDER J THEISEN G TREFZGER T BROOK NH BUSSEY PJ DOYLE AT FLECK I JAMIESON VA SAXON DH UTLEY ML WILSON AS DANNEMANN A HOLM U HORSTMANN D KAMMERLOCHER H KREBS B NEUMANN T SINKUS R WICK K BADURA E BUROW BD FURTJES A HAGGE L LOHRMANN E MAINUSCH J MILEWSKI J NAKAHATA M PAVEL N POELZ G SCHOTT W TERRON J ZETSCHE F BACON TC BEUSELINCK R BUTTERWORTH I GALLO E HARRIS VL HUNG BH LONG KR MILLER DB MORAWITZ PPO PRINIAS A SEDGBEER JK WHITFIELD AF MALLIK U MCCLIMENT E WANG MZ WANG SM WU JT ZHANG Y CLOTH P FILGES D AN SH HONG SM NAM SW PARK SK SUH MH YON SH IMLAY R KARTIK S KIM HJ MCNEIL RR METCALF W NADENDLA VK BARREIRO F CASES G GRACIANI R HERNANDEZ JM HERVAS L LABARGA L DELPESO J PUGA J DETROCONIZ JF SMITH GR CORRIVEAU F HANNA DS HARTMANN J HUNG LW LIM JN MATTHEWS CG PATEL PM SINCLAIR LE STAIRS DG STLAURENT M ULLMANN R ZACEK G BASHIROV V DOLGOSHEIN BA STIFUTKIN A BASHINDZHAGYAN GL ERMOLOV PF GLADILIN LK GOLUBKOV YA KOBRIN VD KUZMIN VA PROSKURYAKOV AS SAVIN AA SHCHEGLOVA LM SOLOMIN AN ZOTOV NP BENTVELSEN S BOTJE M CHLEBANA F DAKE A ENGELEN J DEJONG P DEKAMPS M KOOIJMAN P KRUSE A ODELL V TENNER 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 BLAIR GA BYRNE A CASHMORE RJ COOPERSARKAR AM DANIELS D DEVENISH RCE HARNEW N LANCASTER M LUFFMAN PE LINDEMANN L MCFALL J NATH C QUADT A UIJTERWAAL H WALCZAK R 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 IORI M MARINI G MATTIOLI M NIGRO A TASSI E HART JC MCCUBBIN NA PRYTZ K SHAH TP SHORT TL BARBERIS E CARTIGLIA N DUBBS T HEUSCH C VANHOOK M HUBBARD B LOCKMAN W RAHN JT SADROZINSKI HFW SEIDEN A BILTZINGER J SEIFERT RJ WALENTA AH ZECH G ABRAMOWICZ H BRISKIN G DAGAN S LEVY A HASEGAWA T HAZUMI M ISHII T KUZE M MINE S NAGASAWA Y NAGIRA T NAKAO M SUZUKI I TOKUSHUKU K YAMADA S YAMAZAKI Y CHIBA M HAMATSU R HIROSE T HOMMA K KITAMURA S NAGAYAMA S NAKAMITSU Y CIRIO R COSTA M FERRERO MI LAMBERTI L MASELLI S PERONI C SACCHI R SOLANO A STAIANO A DARDO M BAILEY DC BANDYOPADHYAY D BENARD F BRKIC M CROMBIE MB GINGRICH DM HARTNER GE JOO KK LEVMAN GM MARTIN JF ORR RS SAMPSON CR TEUSCHER RJ CATTERALL CD JONES TW KAZIEWICZ PB LANE JB SAUNDERS RL SHULMAN J BLANKENSHIP K KOCHOCKI J 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 GLASMAN C KARSHON U REVEL D SHAPIRA A ALI I BEHRENS B DASU S FORDHAM C FOUDAS C GOUSSIOU A LOVELESS RJ REEDER DD SILVERSTEIN S SMITH WH TSURUGAI T BHADRA S FRISKEN WR FURUTANI KM
Citation
M. Derrick et al., OBSERVATION OF HARD SCATTERING IN PHOTOPRODUCTION EVENTS WITH A LARGERAPIDITY GAP AT HERA, Physics letters. Section B, 346(3-4), 1995, pp. 399-414
Citations number
33
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
346
Issue
3-4
Year of publication
1995
Pages
399 - 414
Database
ISI
SICI code
0370-2693(1995)346:3-4<399:OOHSIP>2.0.ZU;2-E
Abstract
Events with a large rapidity gap and total transverse energy greater t han 5 GeV have been observed in quasi-real photoproduction at HERA wit h the ZEUS detector. The distribution of these events as a function of the gamma p centre of mass energy is consistent with diffractive scat tering. For total transverse energies above 12 GeV, the hadronic final states show predominantly a two-jet structure with each jet having a transverse energy greater than 4 GeV. For the two-jet events, little e nergy flow is found outside the jets. This observation is consistent w ith the hard scattering of a quasi-real photon with a colourless objec t in the proton.