RAPIDITY GAPS BETWEEN JETS IN PHOTOPRODUCTION AT HERA

Authors
DERRICK M KRAKAUER D MAGILL S MIKUNAS D MUSGRAVE B REPOND J STANEK R TALAGA RL ZHANG H 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 BORNHEIM A CRITTENDEN J DESCH K DIEKMANN B DOEKER T ECKERT M FELD L FREY A GEERTS M GROTHE M HARTMANN H HEINLOTH K HEINZ L HILGER E JAKOB HP KATZ UF MENGEL S MOLLEN J PAUL E PFEIFFER M REMBSER C SCHRAMM D STAMM J WEDEMEYER R CAMPBELLROBSON S CASSIDY A COTTINGHAM WN DYCE N FOSTER B GEORGE S HAYES ME HEATH GP HEATH HF MORGADO CJS OMARA JA PICCIONI D ROFF DG TAPPER RJ YOSHIDA R RAU RR ARNEODO M AYAD R 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 PRZYBYCIEN M RULIKOWSKAZAREBSKA E SUSZYCKI L ZAJAC J KOTANSKI A 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 KF 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 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 MARI SM MATTINGLY MCK MEYER A SCHLENSTEDT S WULFF N BARBAGLI G GALLO E 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 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 HARRIS VL HUNG BYH 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 MCNEIL 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 STLAURENT M ULLMANN R ZACEK G BASHKIROV V DOLGOSHEIN BA STIFUTKIN A BASHINDZHAGYAN GL ERMOLOV PF GLADILIN LK GOLUBKOV YA KOBRIN VD KROZHAVINA 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 GILMORE J HONSCHEID K LI C LING TY MCLEAN KW NYLANDER P 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 OKRASINSKI JR 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 HANDELPIKIELNY C LEVY A FLECK JI 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 DARDO M BAILEY DC BANDYOPADHYAY D BENARD F BRKIC M GINGRICH DM HARTNER GF JOO KK LEVMAN GM MARTIN JF ORR RS POLENZ S SAMPSON CR TEUSCHER RJ CATTERALL CD JONES JW 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 MURRAY WN SCHMIDKE WB
Citation
M. Derrick et al., RAPIDITY GAPS BETWEEN JETS IN PHOTOPRODUCTION AT HERA, Physics letters. Section B, 369(1), 1996, pp. 55-68
Citations number
39
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
369
Issue
1
Year of publication
1996
Pages
55 - 68
Database
ISI
SICI code
0370-2693(1996)369:1<55:RGBJIP>2.0.ZU;2-H
Abstract
Photoproduction events which have two or more jets have been studied i n the W-gamma P range 135 GeV < W-gamma P < 280 GeV with the ZEUS dete ctor at HERA, A class of events is observed with little hadronic activ ity between the jets, The jets are separated by pseudorapidity interva ls (Delta eta) Of up to four units and have transverse energies greate r than 6 GeV. A gap is defined as the absence between the jets of part icles with transverse energy greater than 300 MeV. The fraction of eve nts containing a gap is measured as a function of Delta eta. It decrea ses exponentially as expected for processes in which colour is exchang ed between the jets, up to a value of Delta eta similar to 3, then rea ches a constant value of about 0.1. The excess above the exponential f all-off can be interpreted as evidence for hard diffractive scattering via a strongly interacting colour singlet object.