Data di Pubblicazione:
2000
Abstract:
The first measurement of inclusive D-s(+/-) photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies; 130 < W < 280 GeV The measured cross section for 3 < p(perpendicular to)(Ds) < 12 GeV and \eta(Ds)\ < 1.5 is sigma(ep-->DsX) = 3.79 +/- 0.59(stat.)(-0.46)(+0.26)(syst.) +/- 0.94(br.) nb, where the last error arises from the uncertainty in the D-s(+/-) decay branching ratio. The measurements are compared with inclusive D*(+/-) photoproduction cross sections in the same kinematic region and with QCD calculations. The D-s(+/-) cross sections lie above a fixed-order next-to-leading order calculation and agree better with a tree-level O(alpha alpha(s)(3)) calculation that was tuned to describe the ZEUS D* (+/-) cross sections. The ratio of D-s(+/-) to D*(+/-) cross sections is 0.41 +/- 0.07(stat.)(-0.05)(+0.03)(syst.) +/- 0.10 (br.). From this ratio, the strangeness-suppression factor in charm photoproduction, within the LUND string fragmentation model, has been calculated to be gamma(s)= 0.27 +/- 0.05 +/- 0.07(br.). The cross-section ratio and gamma(s) are in good agreement with those obtained in charm production in e(+)e(-) annihilation. (C) 2000 Elsevier Science B.V. All rights reserved.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
ZEUS; DEEP-INELASTIC SCATTERING; LUND MONTE-CARLO; CROSS-SECTIONS; STRANGENESS SUPPRESSION; PARTON DISTRIBUTIONS; JET FRAGMENTATION; E+E ANNIHILATION; HERA; PHYSICS; PROTON
Elenco autori:
J. Breitweg;S. Chekanov;M. Derrick;D. Krakauer;S. Magill;B. Musgrave;A. Pellegrino;J. Repond;R. Stanek;R. Yoshida;M. C. K.;G. Abbiendi;F. Anselmo;P. Antonioli;G. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;C. Bruni;G. C. Romeo;G. Castellini;L. Cifarelli;F. Cindolo;A. Contin;N. Coppola;M. Corradi;S. D. Pasquale;P. Giusti;G. Iacobucci;G. Laurenti;G. Levi;A. Margotti;T. Massam;R. Nania;F. Palmonari;A. Pesci;A. Polini;G. Sartorelli;Y. Z. Garcia;A. Zichichi;C. Amelung;A. Bornheim;I. Brock;K. Coboken;J. Crittenden;R. Deffner;H. Hartmann;K. Heinloth;E. Hilger;P. Irrgang;H. P. Jakob;A. Kappes;U. F. Katz;R. Kerger;E. Paul;H. Schnurbusch;A. Stifutkin;J. Tandler;K. C. Voss;A. Weber;H. Wieber;D. S. Bailey;O. Barret;N. H. Brook;B. Foster;G. P. Heath;H. F. Heath;J. D. McFall;D. Piccioni;E. Rodrigues;J. Scott;R. J. Tapper;M. Capua;A. Mastroberardino;M. Schioppa;G. Susinno;H. Y. Jeoung;J. Y. Kim;J. H. Lee;I. T. Lim;K. J. Ma;M. Y. Pac;A. Caldwell;W. Liu;X. Liu;B. Mellado;S. Paganis;S. Sampson;W. B. Schmidke;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;K. Klimek;K. Olkiewicz;K. Piotrzkowski;M. B. Przybycien;P. Stopa;L. Zawiejski;B. Bednarek;K. Jelen;D. Kisielewska;A. M. Kowal;T. Kowalski;M. Przybycien;E. Rulikowska-Zarebska;L. Suszycki;D. Szuba;A. Kotanski;L. A. T.;U. Behrens;J. K. Bienlein;C. Burgard;D. Dannheim;K. Desler;G. Drews;A. Fox-Murphy;U. Fricke;F. Goebel;P. Gottlicher;R. Graciani;T. Haas;W. Hain;G. F. Hartner;D. Hasell;K. Hebbel;K. F. Johnson;M. Kasemann;W. Koch;U. Kotz;H. Kowalski;L. Lindemann;B. Lohr;M. Martinez;M. Milite;T. Monteiro;M. Moritz;D. Notz;F. Pelucchi;M. C. Petrucci;M. Rohde;P. R. B.;A. A. Savin;U. Schneekloth;F. Selonke;M. Sievers;S. Stonjek;E. Tassi;G. Wolf;U. Wollmer;C. Youngman;W. Zeuner;C. Coldewey;A. L. D.;A. Meyer;S. Schlenstedt;P. B. Straub;G. Barbagli;E. Gallo;P. Pelfer;G. Maccarrone;L. Votano;A. Bamberger;A. Benen;S. Eisenhardt;P. Markun;H. Raach;S. Wolfle;P. J. Bussey;A. T. Doyle;S. W. Lee;N. Macdonald;G. J. McCance;D. H. Saxon;L. E. Sinclair;I. O. Skillicorn;R. Waugh;I. Bohnet;N. Gendner;U. Holm;A. Meyer-Larsen;H. Salehi;K. Wick;A. Garfagnini;I. Gialas;L. K. Gladilin;D. Kcira;R. Klanner;E. Lohrmann;G. Poelz;F. Zetsche;R. Goncalo;K. R. Long;D. B. Miller;A. D. Tapper;R. Walker;U. Mallik;P. Cloth;D. Filges;T. Ishii;M. Kuze;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;S. H. Ahn;S. B. Lee;S. K. Park;H. Lim;I. H. Park;D. Son;F. Barreiro;G. Garcia;C. Glasman;O. Gonzalez;L. Labarga;J. d. Peso;I. Redondo;J. Terron;M. Barbi;F. Corriveau;D. S. Hanna;A. Ochs;S. Padhi;M. Riveline;D. G. Stairs;M. Wing;T. Tsurugai;V. Bashkirov;B. A. Dolgoshein;R. K. Dementiev;P. F. Ermolov;Y. A. Golubkov;I. I. Katkov;L. A. Khein;N. A. Korotkova;I. A. Korzhavina;V. A. Kuzmin;O. Y. Lukina;A. S. Proskuryakov;L. M. Shcheglova;A. N. Solomin;N. N. Vlasov;S. A. Zotkin;C. Bokel;M. Botje;N. Brummer;J. Engelen;S. Grijpink;E. Koffeman;P. Kooijman;S. Schagen;A. v. Sighem;H. Tiecke;N. Tuning;J. J. Velthuis;J. Vossebeld;I. Wiggers;E. d. Wolf;D. Acosta;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. Grosse-Knetter;T. Matsushita;O. Ruske;M. R. Sutton;R. Walczak;A. Bertolin;R. Brugnera;R. Carlin;F. D. Corso;U. Dosselli;S. Dusini;S. Limentani;M. Morandin;M. Posocco;I. Stanco;R. Stroili;C. Voci;L. Adamczyk;L. Iannotti;B. Y. Oh;J. R. Okrasinski;W. S. Toothacker;J. J. Whitmore;Y. Iga;G. D'Agostini;G. Marini;A. Nigro;C. Cormack;J. C. Hart;N. A. McCubbin;T. P. Shah;D. Epperson;C. Heusch;H. F. W.;A. Seiden;R. Wichmann;D. C. Williams;N. Pavel;H. Abramowicz;S. Dagan;S. Kananov;A. Kreisel;A. Levy;T. Abe;T. Fusayasu;K. Umemori;T. Yamashita;R. Hamatsu;T. Hirose;M. Inuzuka;S. Kita
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