DIFFRACTION DISSOCIATION IN PHOTOPRODUCTION AT HERA

Authors
ADLOFF C AID S ANDERSON M ANDREEV V ANDRIEU B ARKADOV V ARNDT C AYYAZ I BABAEV A BAHR J BAN J BAN Y BARANOV P BARRELET E BARSCHKE R BARTEL W BASSLER U BECK HP BECK M BEHREND HJ BELOUSOV A BERGER C BERNARDI G BERTRANDCOREMANS G BESANCON M BEYER R BIDDULPH P BISPHAM P BIZOT JC BORRAS K BOTTERWECK F BOUDRY V BRAEMER A BRAUNSCHWEIG W BRISSON V BRUCKNER W BRUEL P BRUNCKO D BRUNE C BUCHHOLZ R BUNGENER L BURGER J BUSSER FW BUNIATIAN A BURKE S BURTON MJ CALVET D CAMPBELL AJ CARLI T CHARLET M CLARKE D CLERBAUX B COCKS S CONTRERAS JG CORMACK C COUGHLAN JA COURAU A COUSINOU MC COZZIKA G CRIEGEE L CUSSANS DG CVACH J DAGORET S DAINTON JB DAU WD DAUM K DAVID M DAVIS CL DEROECK A DEWOLF EA DELCOURT B DIRKMANN M DIXON P DLUGOSZ W DOLLFUS C DONOVAN KT DOWELL JD DREIS HB DROUTSKOI A DUNGER O DUHM H EBERT J EBERT TR ECKERLIN G EFREMENKO V EGLI S EICHLER R EISELE F EISENBANDLER E ELSEN E ERDMANN M FAHR AB FAVART L FEDOTOV A FELST R FELTESSE J FERENCEI J FERRAROTTO F FLAMM K ERDMANN W FLEISCHER M FLIESER M FLUGGE G FOMENKO A FORMANEK J FOSTER JM FRANKE G FRETWURST E GABATHULER E GABATHULER K GAEDE F GARVEY J GAYLER J GEBAUER M GENZEL H GERHARDS R GLAZOV A GOERLICH L GOGITIDZE N GOLDBERG M GOLDNER D GOLECBIERNAT K GONZALEZPINEIRO B GORELOV I GRAB C GRASSLER H GREENSHAW T GRIFFITHS RK GRINDHAMMER G GRUBER A GRUBER C HADIG T HAIDT D HAJDUK L HALLER T HAMPEL M HAYNES WJ HEINEMANN B HEINZELMANN G HENDERSON RCW HENSCHEL H HERYNEK I HESS MF HEWITT K HILDESHEIM W HILLER KH HILTON CD HLADKY J HOPPNER M HOFFMANN D HOLTOM T HORISBERGER R HUDGSON VL HUTTE M IBBOTSON M ISSEVER C ITTERBECK H JACHOLKOWSKA A JACOBSSON C JACQUET M JAFFRE M JANOTH J JANSEN DM JANSEN T JONSSON L JOHNSON DP JUNG H KALMUS PIP KANDER M KANT D KASCHOWITZ R KATHAGE U KATZY J KAUFMANN HH KAUFMANN O KAUSCH M KAZARIAN S KENYON IR KERMICHE S KEUKER C KIESLING C KLEIN M KLEINWORT C KNIES G KOHLER T KOHNE JH KOLANOSKI H KOLYA SD KORBEL V KOSTKA P KOTELNIKOV SK KRAMERKAMPER T KRASNY MW KREHBIEL H KRUCKER D KUSTER H KUHLEN M KURCA T KURZHOFER J LAFORGE B LANDON MPJ LANGE W LANGENEGGER U LEBEDEV A LEHNER F LEMAITRE V LEVONIAN S LINDSTROM G LINDSTROEM M LINSEL F LIPINSKI J LIST B LOBO G LOCH P LOMAS JW LOPEZ GC LUBIMOV V LUKE D LYTKIN L MAGNUSSEN N MALINOVSKI E MARACEK R MARAGE P MARKS J MARSHALL R MARTENS J MARTIN G MARTIN R MARTYN HU MARTYNIAK J MAVROIDIS T MAXFIELD SJ MCMAHON SJ MEHTA A MEIER K MERKEL P METLICA F MEYER A MEYER A MEYER H MEYER J MEYER PO MIGLIORI A MIKOCKI S MILSTEAD D MOECK J MOREAU F MORRIS JV MROCZKO E MULLER D MULLER G MULLER K MURIN P NAGOVIZIN V NAHNHAUER R NAROSKA B NAUMANN T NEGRI I NEWMAN PR NEWTON D NGUYEN HK NICHOLLS TC NIEBERGALL F NIEBUHR C NIEDZBALLA C NIGGLI H NOWAK G NUNNEMANN T NYBERGWERTHER M OBERLACK H OLSSON JE OZEROV D PALMEN P PANARO E PANITCH A PASCAUD C PASSAGGIO S PATEL GD PAWLETTA H PEPPEL E PEREZ E PHILLIPS JP PIEUCHOT A PITZL D POSCHL R POPE G POVH B PRELL S RABBERTZ K RADEL G REIMER P RICK H RIESS S RIZVI E ROBMANN P ROOSEN R ROSENBAUER K ROSTOVTSEV A ROUSE F ROYON C RUTER K RUSAKOV S RYBICKI K SANKEY DPC SCHACHT P SCHIEK S SCHLEIF S SCHLEPER P VONSCHLIPPE W SCHMIDT D SCHMIDT G SCHOEFFEL L SCHONING A SCHRODER V SCHUHMANN E SCHWAB B SEFKOW F SEMENOV A SHEKELYAN V SHEVIAKOV I SHTARKOV LN SIEGMON G SIEWERT U SIROIS Y SKILLICORN LO SLOAN T SMIRNOV P SMITH M SOLOCHENKO V SOLOVIEV Y SPECKA A SPIEKERMANN J SPIELMAN S SPITZER H SQUINABOL F STEFFEN P STEINBERG R STEINER H STEINHART J STELLA B STELLBERGER A STIER J STIEWE J STOSSLEIN U STOLZE K STRAUMANN U STRUCZINSKI W SUTTON JP TAPPROGGE S TASEVSKY M TCHERNYSHOV V TCHETCHELNITSKI S THEISSEN KJ THIEBAUX C THOMPSON G TOBIEN N TODENHAGEN R TRUOL P TSIPOLITIS G TURNAU J TZAMARIUDAKI E UELKES P USIK A VALKAR S VALKAROVA A VALLEE C VANESCH P VANMECHELEN P VANDENPLAS D VAZDIK Y VERRECCHIA P VILLET G WACKER K WAGENER A WAGENER M WAUGH B WEBER G WEBER M WEGENER D WEGNER A WENGLER T WERNER M WEST LR WILKSEN T WILLARD S WINDE M WINTER GG WITTEK C WOBISCH M WOLLATZ H WUNSCH E ZACEK J ZARBOCK D ZHANG Z ZHOKIN A ZINI P ZOMER F ZSEMBERY J ZUBER K ZURNEDDEN M
Citation
C. Adloff et al., DIFFRACTION DISSOCIATION IN PHOTOPRODUCTION AT HERA, Zeitschrift fur Physik. C, Particles and fields, 74(2), 1997, pp. 221-235
Citations number
67
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
74
Issue
2
Year of publication
1997
Pages
221 - 235
Database
ISI
SICI code
0170-9739(1997)74:2<221:DDIPAH>2.0.ZU;2-#
Abstract
A study is presented of the process gamma p --> XY, where there is a l arge rapidity gap between the systems X and Y. Measurements are made o f the differential cross section as a function of the invariant mass M -x of the system produced at the photon vertex. Results are presented at centre of mass energies of [W] = 187 G2V and [W] = 231 GeV, both wh ere the proton dominantly remains intact and, for the first time, wher e it dissociates. Both the centre of mass energy and the M-x(2) depend ence of HERA data and those from a fixed target experiment may simulta neously be described in a triple-Regge model. The low mass photon diss ociation process is found to be dominated by diffraction, though a siz able subleading contribution is present at larger masses. The pomeron intercept is extracted and found to be alpha(p)(0) = 1.068 +/- 0.016 ( stat.) +/- 0.022 (syst.) +/- 0.041 (model), in good agreement with val ues obtained from total and elastic hadronic and photoproduction cross sections. The diffractive contribution to the process gamma p --> Xp with M-x(2)/W-2 < 0.05 is measured to be 22.2 +/- 0.6 (stat.) +/- 2.6 (syst.) +/- 1.7 (model) % of the total gamma p cross section at [W] = 187 GeV.