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Measurement of the cross-section for the reaction gamme-P-]J/PSI-P with the ZEUS detector at HERA
Authors :
DERRICK, M KRAKAUER, D MAGILL, S MIKUNAS, D MUSGRAVE, B REPOND, J STANEK, R TALAGA, R L ZHANG, H AYAD, R BARI, G BASILE, M BELLAGAMBA, L BOSCHERINI, D BRUNI, A BRUNI, G BRUNI, P ROMEO, G C 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, Y Z ZICHICHI, A BARGENDE, A CRITTENDEN, J DESCH, K DIEKMANN, B DOEKER, T ECKERT, M FELD, L FREY, A GEERTS, M GEITZ, G GROTHE, M HAAS, T HARTMANN, H HAUN, D HEINLOTH, K HILGER, E JAKOB, H P KATZ, U F MARI, S M 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, Simon GILMORE, R HEATH, G P HEATH, H F LLEWELLYN, T J MORGADO, C J S NORMAN, D J P OMARA, J A TAPPER, R J WILSON, S S YOSHIDA, R RAU, R R ARNEODO, M IANNOTTI, L SCHIOPPA, M SUSINNO, G BERNSTEIN, A CALDWELL, A CARTIGLIA, N PARSONS, J A RITZ, S SCIULLI, F STRAUB, P B 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, L A T BEHRENS, U BEIER, H BIENLEIN, J K COLDEWEY, C DEPPE, O DESLER, K DREWS, G FLASINSKI, M GILKINSON, D J GLASMAN, C GOTTLICHER, P GROSSEKNETTER, J GUTJAHR, B HAIN, W HASELL, D HESSLING, H IGA, Y JOOS, P KASEMANN, M KLANNER, R KOCH, W KOPKE, L KOTZ, U KOWALSKI, H LABS, J LADAGE, A LOHR, B LOWE, M LUKE, D MANCZAK, O MONTEIRO, T NG, J S T 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 ZHOU, J F GRABOSCH, H J KHARCHILAVA, A LEICH, A MATTINGLY, M C K 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, N H BUSSEY, P J DOYLE, A T FLECK, J I SAXON, D H UTLEY, M L WILSON, A S DANNEMANN, A HOLM, U HORSTMANN, D NEUMANN, T SINKUS, R WICK, K BADURA, E BUROW, B D HAGGE, L LOHRMANN, E MAINUSCH, J MILEWSKI, J NAKAHATA, M PAVEL, N POELZ, G SCHOTT, W ZETSCHE, F BACON, T C BUTTERWORTH, I GALLO, E HARRIS, V L HUNG, B Y H LONG, K R MILLER, D B MORAWITZ, P P O PRINIAS, A SEDGBEER, J K WHITFIELD, A F MALLIK, U MCCLIMENT, E WANG, M Z WANG, S M WU, J T ZHANG, Y CLOTH, P FILGES, D AN, S H HONG, S M NAM, S W PARK, S K SUH, M H YON, S H IMLAY, R KARTIK, S KIM, H J MCNEIL, R R METCALF, W NADENDLA, V K BARREIRO, F CASES, G GRACIANI, R HERNANDEZ, J M HERVAS, L LABARGA, L DELPESO, J PUGA, J TERRON, J DETROCONIZ, J F SMITH, G R CORRIVEAU, F HANNA, D S HARTMANN, J HUNG, L W LIM, J N MATTHEWS, C G PATEL, P M SINCLAIR, L E STAIRS, D G STLAURENT, M ULLMANN, R ZACEK, G BASHKIROV, V DOLGOSHEIN, B A STIFUTKIN, A BASHINDZHAGYAN, G L ERMOLOV, P F GLADILIN, L K GOLUBKOV, Y A KOBRIN, V D KUZMIN, V A PROSKURYAKOV, A S SAVIN, A A SHCHEGLOVA, L M SOLOMIN, A N ZOTOV, N P 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, L S HONSCHEID, K LI, C LING, T Y MCLEAN, K W MURRAY, W N PARK, I H ROMANOWSKI, T A SEIDLEIN, R BAILEY, D S BLAIR, G A BYRNE, A CASHMORE, R J COOPERSARKAR, A M DANIELS, D DEVENISH, R C E HARNEW, N LANCASTER, M LUFFMAN, P E LINDEMANN, L MCFALL, J D NATH, C NOYES, V A QUADT, A UIJTERWAAL, H WALCZAK, R WILSON, F F 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, J M FEILD, R G OH, B Y WHITEMORE, J J DAGOSTINI, G MARINI, G NIGRO, A TASSI, E HART, J C MCCUBBIN, N A PRYTZ, K SHAH, T P SHORT, T L BARBERIS, E DUBBS, T HEUSCH, C VANHOOK, M HUBBARD, B LOCKMAN, W RAHN, J T SADROZINSKI, H F W SEIDEN, A BILTZINGER, J SEIFERT, R J WALENTA, A H 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, M I LAMBERTI, L MASELLI, S PERONI, C SACCHI, R SOLANO, A STAIANO, A DARDO, M BAILEY, D C BANDYOPADHYAY, D BENARD, F BRKIC, M CROMBIE, M B GINGRICH, D M HARTNER, G F JOO, K K LEVMAN, G M MARTIN, J F ORR, R S SAMPSON, C R TEUSCHER, R J CATTERALL, C D JONES, T W KAZIEWICZ, P B LANE, J B SAUNDERS, R L SHULMAN, J BLANKENSHIP, K LU, B MO, L W BOGUSZ, W CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, R J PAWLAK, J M TYMIENIECKA, T WROBLEWSKI, A K ZAKRZEWSKI, J A ZARNECKI, A F ADAMUS, M EISENBERG, Y KARSHON, U REVEL, D ZERZION, D ALI, I BADGETT, W F BEHRENS, B DASU, S FORDHAM, C FOUDAS, C GOUSSIOU, A LOVELESS, R J REEDER, D D SILVERSTEIN, S SMITH, W H VAICIULIS, A WODARCZYK, M TSURUGAI, T BHADRA, S CARDY, M L FAGERSTROEM, C P FRISKEN, W R FURUTANI, K M KHAKZAD, M SCHMIDKE, W B
Source :
Physics Letters B, 350 (1)
Publication Year :
1995
Abstract
This paper reports the cross section measurements for the process ep --> e J/psi p for Q(2) < 4 GeV2 at root s = 296 GeV, based on an integrated luminosity of about 0.5 pb(-1), using the ZEUS detector. The J/psi was detected in its e(+)e(-) and mu(+)mu(-) decay modes. The photoproduction cross section was measured to be 52(-12)(+7) +/- 10 nb at an average gamma p centre of mass energy of 67 GeV and 71(-20)(+13) +/- 12 nb at 114 GeV. The significant rise of the cross section compared to lower energy measurements is not in agreement with VDM models, but can be described by QCD inspired models if a rise in the gluon momentum density at low x in the proton is assumed.
Details
Language :
English
Database :
OpenAIRE
Journal :
Physics Letters B, 350 (1)
Accession number :
edsair.dedup.wf.001..49cbd905c6330ae7aa162160e9b39e51