Data di Pubblicazione:
2002
Abstract:
Diffractive dissociation of virtual photons, gamma*p --> Xp, has beer, studied ill ep interactions with the ZEUS detector at HERA. The data cover photon virtualities 0.17 < Q(2) < 0.70 GeV and 3 < Q(2) < 80 GeV(2) with 3 < M(X) < 38 GeV, where M(X) is the mass of the hadronic final state. Diffractive events were selected by two methods: the first required the detection of the scattered proton in the ZEUS leading proton spectrometer (LPS); the second was based on the distribution of M(X). The integrated luminosities of the low- and high-Q(2) samples used in the LPS-based analysis are similar or equal to 0.9 pb(-1) and similar or equal to 3.3 pb(-1), respectively. The sample used for the M(X)-based analysis corresponds to an integrated luminosity of similar or equal to 6.2 pb(-1). The dependence of the diffractive cross section on W, the virtual photon-proton centre-of-mass energy. and on Q(2) is studied. In the low-Q(2) range, the energy dependence is compatible with Regge theory and is used to determine the intercept of the Pomeron trajectory. The W dependence of the diffractive cross section exhibits no significant change from the low-Q(2) to the high-Q(2) region. In the low-Q range, little Q(2) dependence is found, a significantly different behaviour from the rapidly falling cross section measured for Q(2) > 3 GeV(2). The ratio of the diffractive to the virtual photon-proton total cross sect ion is studied as a function of W and Q(2). Comparisons are made with a model based oil perturbative QCD.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
ZEUS; DEEP-INELASTIC SCATTERING; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; REAR CALORIMETER; CROSS-SECTION; LOW X; PHOTOPRODUCTION; DISSOCIATION; CONSTRUCTION; DESIGN
Elenco autori:
S. Chekanov;D. Krakauer;S. Magill;B. Musgrave;A. Pellegrino;J. Repond;R. Yoshida;M. C. K.;P. Antonioli;G. Anzivino;G. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;G. Bruni;G. C. Romeo;M. Chiarini;L. Cifarelli;F. Cindolo;A. Contin;M. Corradi;S. D. Pasquale;P. Giusti;G. Iacobucci;G. Levi;A. Margotti;T. Massam;R. Nania;C. Nemoz;F. Palmonari;A. Pesci;G. Sartorelli;Y. Z. Garcia;A. Zichichi;G. Aghuzumtsyan;D. Bartsch;I. Brock;J. Crittenden;S. Goers;H. Hartmann;E. Hilger;P. Irrgang;H. P. Jakob;A. Kappes;U. F. Katz;R. Kerger;O. Kind;E. Paul;J. Rautenberg;R. Renner;H. Schnurbusch;A. Stifutkin;J. Tandler;K. C. Voss;A. Weber;D. S. Bailey;N. H. Brook;J. E. Cole;B. Foster;G. P. Heath;H. F. Heath;S. Robins;E. Rodrigues;J. Scott;R. J. Tapper;M. Wing;R. Ayad;M. Capua;L. Iannotti;A. Mastroberardino;M. Schioppa;G. Susinno;J. Y. Kim;Y. K. Kim;J. H. Lee;I. T. Lim;M. Y. Pac;A. Caldwell;M. Helbich;X. Liu;B. Mellado;S. Paganis;W. B. Schmidke;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;K. Olkiewicz;M. B. Przybycien;P. Stopa;L. Zawiejski;B. Bednarek;I. Grabowska-Bold;K. Jelen;D. Kisielewska;A. M. Kowal;M. Kowal;T. Kowalski;B. Mindur;M. Przybycien;E. Rulikowska-Zarebska;L. Suszycki;D. Szuba;J. Szuba;A. Kotanski;W. Slominski;L. A. T.;U. Behrens;K. Borras;V. Chiochia;D. Dannheim;M. Derrick;G. Drews;J. Fourletova;A. Fox-Murphy;U. Fricke;A. Geiser;F. Goebel;P. Gottlicher;O. Gussche;T. Haas;W. Hain;G. F. Hartner;S. Hillert;U. Kotz;H. Kowalski;H. Labes;D. Lelas;B. Lohr;R. Mankel;M. Martinez;M. Moritz;D. Notz;I. A. Pellmann;M. C. Petrucci;A. Polini;U. Schneekloth;F. Selonke;B. Surrow;H. Wessoleck;R. Wichmann;G. Wolf;C. Youngman;W. Zeuner;A. L. D.;A. Meyer;S. Schlenstedt;G. Barbagli;E. Gallo;C. Genta;P. G. Pelfer;A. Bamberger;A. Benen;N. Coppola;P. Markun;H. Raach;S. Wolfle;M. Bell;P. J. Bussey;A. T. Doyle;C. Glasman;S. Hanlon;S. W. Lee;A. Lupi;G. J. McGance;D. H. Saxon;I. O. Skillicorn;I. Gialas;B. Bodmann;T. Carli;U. Holm;K. Klimek;E. Lohrmann;M. Milite;H. Salehi;S. Stonjek;K. Wicks;A. Ziegler;A. Ziegler;C. Collins-Tooth;C. Foudas;R. Goncalo;K. R. Long;F. Metlica;D. B. Miller;A. D. Tapper;R. Walker;P. Cloth;D. Filges;M. Kuze;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;A. N. Barakbaev;E. G. Boos;N. S. Pokrovskiy;B. O. Zhautykov;H. Lim;D. Son;F. Barreiro;O. Gonzalez;L. Labarga;J. d. Peso;I. Redondo;J. Terron;M. Vazquez;M. Barbi;A. Bertolin;F. Corriveau;A. Ochs;S. Padhi;D. G. Stairs;M. St-Laurent;T. Tsurugai;A. Antonov;V. Bashkirov;P. Danilov;B. A. Dolgoshein;D. Gladkov;V. Sosnovtsev;S. Suchkov;R. K. Dementiev;P. F. Ermolov;Y. A. Golubkov;I. I. Katkov;L. A. Khein;I. A. Korzhavina;V. A. Kuzmin;B. B. Levchenko;O. Y. Lukina;A. S. Proskuryakov;L. M. Shcheglova;N. N. Vlasov;S. A. Zotkin;C. Bokel;J. Engelen;S. Grijpink;E. Koffeman;P. Kooijman;E. Maddox;S. Schagen;E. Tassi;H. Tiecke;N. Tunin;J. J. Velthuis;L. Wiggers;E. d. Wolf;N. Brummer;B. Bylsma;L. S. Durkin;J. Gilmore;C. M. Ginsburg;C. L. Kim;T. Y. Ling;S. Boogert;A. M. Cooper-Sarkar;R. C. E.;J. Ferrando;G. Grzelak;M. Rigby;O. Ruske;M. R. Sutton;R. Walczak;R. Brugnera;R. Carlin;F. D. Corso;S. Dusini;A. Garfagnini;S. Limentani;A. Longhin;A. Parenti;M. Posocco;L. Stanco;M. Turcato;L. Adamczyk;E. A. Heaphy;B. Y. Oh;P. R. B.;J. J. Whitmore;Y. Iga;G. D'Agostini;G. Marini;A. Nigro;C. Cormack;J. C. Hart;N. A. McCubbin;E. Barberis;C. Heusch;W. Lockman;J. T. Rahn;H. F. W.;A. Seiden;D. C. Williams;I. H. Park;N. Pavel;H. Abramowicz;S. Dagan;A. Gabareen;S. Kananov;A. Kreisel;A. Levy;T. Abe;T. Fusayasu;T. Kohno;K. Umemori;T. Yamashita;R. Hamatsu;T. Hirose;M. Inuzuka;S. Kitamura;K. Matsuzawa;T. Nishimura;M. Arneodo;N. Cartiglia;R. Cirio;M. Costa;M. I. Ferrero;L. Lamberti;S. Maselli;V. Monaco;C. Peron
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