Measurement of the Cross-section For the Reaction Gamma-p-]j/psi-p With the Zeus Detector At Hera
Articolo
Data di Pubblicazione:
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.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
ZEUS; LUND MONTE-CARLO; ELASTIC-SCATTERING; BARREL CALORIMETER; PHOTOPRODUCTION; J/PSI; DESIGN
Elenco autori:
M. DERRICK;D. KRAKAUER;S. MAGILL;D. MIKUNAS;B. MUSGRAVE;J. REPOND;R. STANEK;R. L. TALAGA;H. ZHANG;R. AYAD;G. BARI;M. BASILE;L. BELLAGAMBA;D. BOSCHERINI;A. BRUNI;G. BRUNI;P. BRUNI;G. C. ROMEO;G. CASTELLINI;M. CHIARINI;L. CIFARELLI;F. CINDOLO;A. CONTIN;M. CORRADI;I. GIALAS;P. GIUSTI;G. IACOBUCCI;G. LAURENTI;G. LEVI;A. MARGOTTI;T. MASSAM;R. NANIA;C. NEMOZ;F. PALMONARI;A. POLINI;G. SARTORELLI;R. TIMELLINI;Y. Z. GARCIA;A. ZICHICHI;A. BARGENDE;J. CRITTENDEN;K. DESCH;B. DIEKMANN;T. DOEKER;M. ECKERT;L. FELD;A. FREY;M. GEERTS;G. GEITZ;M. GROTHE;T. HAAS;H. HARTMANN;D. HAUN;K. HEINLOTH;E. HILGER;H. P. JAKOB;U. F. KATZ;S. M. MARI;A. MASS;S. MENGEL;J. MOLLEN;E. PAUL;C. REMBSER;R. SCHATTEVOY;D. SCHRAMM;J. STAMM;R. WEDEMEYER;S. CAMPBELLROBSON;A. CASSIDY;N. DYCE;B. FOSTER;S. GEORGE;R. GILMORE;G. P. HEATH;H. F. HEATH;T. J. LLEWELLYN;C. J. S.;D. J. P.;J. A. OMARA;R. J. TAPPER;S. S. WILSON;R. YOSHIDA;R. R. RAU;M. ARNEODO;L. IANNOTTI;M. SCHIOPPA;G. SUSINNO;A. BERNSTEIN;A. CALDWELL;N. CARTIGLIA;J. A. PARSONS;S. RITZ;F. SCIULLI;P. B. STRAUB;L. WAI;S. YANG;Q. ZHU;P. BORZEMSKI;J. CHWASTOWSKI;A. ESKREYS;K. PIOTRZKOWSKI;M. ZACHARA;L. ZAWIEJSKI;L. ADAMCZYK;B. BEDNAREK;K. JELEN;D. KISIELEWSKA;T. KOWALSKI;E. RULIKOWSKAZAREBSKA;L. SUSZYCKI;J. ZAJAC;A. KOTANSKI;M. PRZYBYCIEN;L. A. T.;U. BEHRENS;H. BEIER;J. K. BIENLEIN;C. COLDEWEY;O. DEPPE;K. DESLER;G. DREWS;M. FLASINSKI;D. J. GILKINSON;C. GLASMAN;P. GOTTLICHER;J. GROSSEKNETTER;B. GUTJAHR;W. HAIN;D. HASELL;H. HESSLING;Y. IGA;P. JOOS;M. KASEMANN;R. KLANNER;W. KOCH;L. KOPKE;U. KOTZ;H. KOWALSKI;J. LABS;A. LADAGE;B. LOHR;M. LOWE;D. LUKE;O. MANCZAK;T. MONTEIRO;J. S. T.;S. NICKEL;D. NOTZ;K. OHRENBERG;M. ROCO;M. ROHDE;J. ROLDAN;U. SCHNEEKLOTH;W. SCHULZ;F. SELONKE;E. STILIARIS;B. SURROW;T. VOSS;D. WESTPHAL;G. WOLF;C. YOUNGMAN;J. F. ZHOU;H. J. GRABOSCH;A. KHARCHILAVA;A. LEICH;M. C. K.;A. MEYER;S. SCHLENSTEDT;N. WULFF;G. BARBAGLI;P. PELFER;G. ANZIVINO;G. MACCARRONE;S. DEPASQUALE;L. VOTANO;A. BAMBERGER;S. EISENHARDT;A. FREIDHOF;S. SOLDNERREMBOLD;J. SCHROEDER;T. TREFZGER;N. H. BROOK;P. J. BUSSEY;A. T. DOYLE;J. I. FLECK;D. H. SAXON;M. L. UTLEY;A. S. WILSON;A. DANNEMANN;U. HOLM;D. HORSTMANN;T. NEUMANN;R. SINKUS;K. WICK;E. BADURA;B. D. BUROW;L. HAGGE;E. LOHRMANN;J. MAINUSCH;J. MILEWSKI;M. NAKAHATA;N. PAVEL;G. POELZ;W. SCHOTT;F. ZETSCHE;T. C. BACON;I. BUTTERWORTH;E. GALLO;V. L. HARRIS;B. Y. H.;K. R. LONG;D. B. MILLER;P. P. O.;A. PRINIAS;J. K. SEDGBEER;A. F. WHITFIELD;U. MALLIK;E. MCCLIMENT;M. Z. WANG;S. M. WANG;J. T. WU;Y. ZHANG;P. CLOTH;D. FILGES;S. H. AN;S. M. HONG;S. W. NAM;S. K. PARK;M. H. SUH;S. H. YON;R. IMLAY;S. KARTIK;H. J. KIM;R. R. MCNEIL;W. METCALF;V. K. NADENDLA;F. BARREIRO;G. CASES;R. GRACIANI;J. M. HERNANDEZ;L. HERVAS;L. LABARGA;J. DELPESO;J. PUGA;J. TERRON;J. F. DETROCONIZ;G. R. SMITH;F. CORRIVEAU;D. S. HANNA;J. HARTMANN;L. W. HUNG;J. N. LIM;C. G. MATTHEWS;P. M. PATEL;L. E. SINCLAIR;D. G. STAIRS;M. STLAURENT;R. ULLMANN;G. ZACEK;V. BASHKIROV;B. A. DOLGOSHEIN;A. STIFUTKIN;G. L. BASHINDZHAGYAN;P. F. ERMOLOV;L. K. GLADILIN;Y. A. GOLUBKOV;V. D. KOBRIN;V. A. KUZMIN;A. S. PROSKURYAKOV;A. A. SAVIN;L. M. SHCHEGLOVA;A. N. SOLOMIN;N. P. ZOTOV;M. BOTJE;F. CHLEBANA;A. DAKE;J. ENGELEN;M. DEKAMPS;P. KOOIJMAN;A. KRUSE;H. TIECKE;W. VERKERKE;M. VREESWIJK;L. WIGGERS;E. DEWOLF;R. VANWOUDENBERG;D. ACOSTA;B. BYLSMA;L. S. DURKIN;K. HONSCHEID;C. LI;T. Y. LING;K. W. MCLEAN;W. N. MURRAY;I. H. PARK;T. A. ROMANOWSKI;R. SEIDLEIN;D. S. BAILEY;G. A. BLAIR;A. BYRNE;R. J. CASHMORE;A. M. COOPERSARKAR;D. DANIELS;R. C. E.;N. HARNEW;M. LANCASTER;P. E. LUFFMAN;L. LINDEMANN;J. D. MCFALL;C. NATH;V. A. NOYES;A. QUADT;H. UIJTERWAAL;R. WALCZAK;F. F. WILSON;T. YIP;G. ABBIENDI;A. BERTOLIN;R. BRUGNERA;R. CARLIN;F. DALCORSO;M. DEGIORGI;U.
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