Data di Pubblicazione:
2005
Abstract:
The production of D*+, D0, D+ , Ds+ and lambda_c+ charm hadrons and their antiparticles in e p scattering at HERA was measured with the ZEUS detector using an integrated luminosity of 79 pb-1 . The measurement has been performed in the photoproduction regime with the exchanged-photon virtuality Q2 < 1 GeV2 and for photon-proton centre-of-mass energies in the range 130 < W < 300 GeV. The charm hadrons were reconstructed in the range of transverse momentum p_T(D,lambda_c) > 3.8 GeV and pseudorapidity eta(D,\Lambda_c) < 1.6 . The production cross sections were used to determine the ratio of neutral and charged D-meson production rates, Ru/d , the strangeness-suppression factor, gamma_s, and the fraction of charged D mesons produced in a vector state. The measured Ru/d and gamma_s values agree with those obtained in deep inelastic scattering and in e + e- annihilations. The results generally support the hypothesis that fragmentation proceeds independently of the hard sub-process.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
High Energy Physics; HERA; ZEUS Collaboration; DEEP INELASTIC-SCATTERING; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; LUND MONTE-CARLO; JET FRAGMENTATION; HADRON PRODUCTION; cross sections; EP-COLLISIONS; PARTON DISTRIBUTIONS
Elenco autori:
S. Chekanov;T. Derrick;S. Magill;S. Miglioranzi;B. Musgrave;J. Repond;R. Yoshida;M. C. K.;N. Pavel;A. G. Y.;P. Antonioli;C. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;G. Bruni;G. C. Romeo;L. Cifarelli;F. Cindolo;A. Contin;M. Corradi;S. D. Pasquale;P. Giusti;G. Iacobucci;A. Margotti;A. Montanari;R. Nania;F. Palmonari;A. Pesci;A. Polini;L. Rinaldi;C. Sartorelli;A. Zichichi;G. Aghuzumtsyan;D. Bartsch;I. Brock;S. Goers;H. Hartmann;E. Hilger;P. Irrgang;H. P. Jakob;O. M. Kind;U. Meyer;E. Paul;J. Rautenberg;R. Renner;M. Wang;M. Wlasenko;D. S. Bailey;N. H. Brook;J. E. Cole;G. P. Heath;T. Namsoo;S. Robins;M. Capua;S. Fazio;A. Mastroberardino;M. Schioppa;G. Susinno;E. Tassi;J. Y. Kim;K. J. Ma;M. Helbich;Y. Ning;Z. Ren;W. B. Schmidke;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;A. Galas;M. Gil;K. Olkiewicz;P. Stopa;D. Szuba;L. Zawiejski;L. Adamczyk;T. Bold;I. Grabowska-Bold;D. Kisielewska;J. Lukasik;M. Przybycien;L. Suszycki;J. Szuba;A. Kotanski;W. Slominski;V. Adler;U. Behrens;I. Bloch;K. Borras;G. Drews;J. Fourletova;A. Geiser;D. Gladkov;P. Gottlicher;O. Gutsche;T. Haas;W. Hain;C. Horn;B. Kahle;U. Kotz;H. Kowalski;G. Kramberger;H. Lim;B. Lohr;R. Mankel;I. A. Melzer-Pellmann;C. N. Nguyen;D. Notz;A. E. Nuncio-Quiroz;A. Raval;R. Santamarta;U. Schneekloth;H. Stadie;U. Stosslein;G. Wolf;C. Youngman;W. Zeuner;S. Schlenstedt;G. Barbagli;E. Gallo;C. Genta;P. G. Pelfer;A. Bamberger;A. Benen;F. Karstens;D. Dobur;N. N. Vlasov;P. J. Bussey;A. T. Doyle;W. Dunne;J. Ferrando;J. H. McKenzie;D. H. Saxon;I. O. Skillicorn;I. Gialas;T. Carli;T. Gosau;U. Holm;N. Krumnack;E. Lohrmann;M. Milite;H. Salehi;P. Schleper;T. Schorner-Sadenius;S. Stonjek;K. Wichmann;K. Wick;A. Ziegler;A. Ziegler;C. Collins-Tooth;C. Foudas;C. Fry;R. Goncalo;K. R. Long;A. D. Tapper;M. Kataoka;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;A. N. Barakbaev;E. G. Boos;N. S. Pokrovskiy;B. O. Zhautykov;D. Son;J. d. Favereau;K. Piotrzkowski;F. Barreiro;C. Glasman;M. Jimenez;L. Labarga;J. d. Peso;J. Terron;M. Zambrana;F. Corriveau;C. Liu;M. Plamondon;A. Robichaud-Veronneau;R. Walsh;C. Zhou;T. Tsurugai;A. Antonov;B. A. Dolgoshein;I. Rubinsky;V. Sosnovtsev;A. Stifutkin;S. Suchkov;R. K. Dementiev;P. F. Ermolov;L. K. Gladilin;I. I. Katkov;L. A. Khein;I. A. Korzhavina;V. A. Kuzmin;B. B. Levchenko;O. Y. Lukina;A. S. Proskuryakov;L. M. Shcheglova;D. S. Zotkin;S. A. Zotkin;I. Abt;C. Buttner;A. Caldwell;X. Liu;J. Sutiak;N. Coppola;G. Grigorescu;A. Keramidas;E. Koffeman;P. Kooijman;E. Maddox;H. Tiecke;M. Vazquez;L. Wiggers;N. Brummer;B. Bylsma;L. S. Durkin;A. Lee;T. Y. Ling;P. D. Allfrey;M. A. Bell;A. M. Cooper-Sarkar;A. Cottrell;R. C. E.;B. Foster;C. Gwenlan;T. Kohno;K. Korcsak-Gorzo;S. Patel;V. Roberfroid;P. B. Straub;R. Walczak;P. Bellan;A. Bertolin;R. Brugnera;R. Carlin;R. Ciesielski;F. D. Corso;S. Dusini;A. Carfagnini;S. Limentani;A. Longhin;L. Stanco;M. Turcato;E. A. Heaphy;F. Metlica;B. Y. Oh;J. J. Whitmore;Y. Iga;G. D'Agostini;G. Marini;A. Nigro;J. C. Hart;H. Abramowicz;A. Gabareen;S. Kananov;A. Kreisel;A. Levy;N. Kuze;S. Kagawa;T. Tawara;R. Hamatsu;H. Kaji;S. Kitamura;K. Matsuzawa;O. Ota;Y. D. Ri;M. Costa;M. I. Ferrero;V. Monaco;R. Sacchi;A. Solano;M. Arneodo;A. Ruspa;S. Fourletov;J. F. Martin;J. A. Butterworth;R. Hall-Wilton;T. W. Jones;J. H. Loizides;M. R. Sutton;C. Targett-Adams;M. Wing;J. Ciborowski;G. Grzelak;P. Kulinski;P. Luzniak;J. Malka;R. J. Nowak;J. M. Pawlak;J. Sztuk;T. Tymieniecka;A. Ukleja;J. Ukleja;A. F. Zarnecki;M. Adamus;P. Plucinski;Y. Eisenberg;D. Hochman;U. Karshon;M. S. Lightwood;E. Brownson;T. Danielson;A. Everett;D. Kcira;S. Lammers;L. Li;D. D. Reeder;M. Rosin;P. Ryan;A. A. Savin;W. H. Smith;S. Dhawan;S. Bhadra;C. D. Catterall;Y. Cui;G. Hartner;S. Menary;U. Noor;M. Soares;J. Standage;J. Whyte
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