Differential cross sections for jet photoproduction in the reaction ep --> e jet X have been measured with the ZEUS detector at HERA using 82.2 pb(-1) of integrated luminosity. Inclusive jet cross sections are presented as a function of the jet transverse energy, E-T(jet), for jets with E-T(jet) > 17 GeV and pseudorapidity -1 < eta(jet) < 2.5, in the gammap centre-of-mass-energy range 142 < Wgammap < 293 GeV. Scaled jet invariant cross sections are presented as a function of the dimensionless variable x(T) equivalent to 2E(T)(jet)/W-gammap for (W-gammap) = 180 and 255 GeV: Next-to-leading-order QCD calculations give a good description of the measured differential cross sections in both magnitude and shape. The ratio of scaled jet invariant cross sections at the two (Wgammap) values shows clear non-scaling behaviour. A value for the strong coupling constant of alpha(s) (M-Z) = 0.1224 +/- 0.0001(stat.)(-0.0019)(+0.0022)(exp.)(-0.0042)(+0.0054)(th.) has been extracted from a QCD analysis of the measured dsigma/dE(T)(jet). The variation of sigma(s) with E-T(jet) is in good agreement with the running of sigma(s) as predicted by QCD. (C) 2003 Published by Elsevier Science B.V.

Scaling violations and determination of alpha(s) from jet production in gamma p interactions at HERA

MONACO, Vincenzo;SACCHI, Roberto;SOLANO, Ada Maria;
2003-01-01

Abstract

Differential cross sections for jet photoproduction in the reaction ep --> e jet X have been measured with the ZEUS detector at HERA using 82.2 pb(-1) of integrated luminosity. Inclusive jet cross sections are presented as a function of the jet transverse energy, E-T(jet), for jets with E-T(jet) > 17 GeV and pseudorapidity -1 < eta(jet) < 2.5, in the gammap centre-of-mass-energy range 142 < Wgammap < 293 GeV. Scaled jet invariant cross sections are presented as a function of the dimensionless variable x(T) equivalent to 2E(T)(jet)/W-gammap for (W-gammap) = 180 and 255 GeV: Next-to-leading-order QCD calculations give a good description of the measured differential cross sections in both magnitude and shape. The ratio of scaled jet invariant cross sections at the two (Wgammap) values shows clear non-scaling behaviour. A value for the strong coupling constant of alpha(s) (M-Z) = 0.1224 +/- 0.0001(stat.)(-0.0019)(+0.0022)(exp.)(-0.0042)(+0.0054)(th.) has been extracted from a QCD analysis of the measured dsigma/dE(T)(jet). The variation of sigma(s) with E-T(jet) is in good agreement with the running of sigma(s) as predicted by QCD. (C) 2003 Published by Elsevier Science B.V.
2003
560
7
23
http://dx.doi.org/10.1016/S0370-2693(03)00380-0
ZEUS; DEEP-INELASTIC SCATTERING; CENTRAL TRACKING DETECTOR; LUND MONTE-CARLO; EP COLLIDER HERA; CROSS-SECTIONS; PARTON DISTRIBUTIONS; HADRON-COLLISIONS; PROTON COLLISIONS; QCD ANALYSIS; E+E-PHYSICS
S. Chekanov;D. Krakauer;J. H. Loizides;S. Magill;B. Musgrave;J. Repond;R. Yoshida;M. C. K.;P. Antonioli;G. 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;R. Nania;F. Palmonari;A. Pesci;G. Sartorelli;A. Zichichi;G. Aghuzumtsyan;D. Bartsch;I. Brock;S. Goers;H. Hartmann;E. Hilger;P. Irrgang;H. P. Jakob;A. Kappes;U. F. Katz;O. Kind;E. Paul;J. Rautenberg;R. Renner;H. Schnurbusch;A. Stifutkin;J. Tandler;K. C. Voss;M. Wang;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;M. Capua;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;Y. Ning;S. Paganis;Z. Ren;W. B. Schmidke;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;K. Olkiewicz;P. Stopa;L. Zawiejski;L. Adamczyk;T. Bold;I. Grabowska-Bold;D. Kisielewska;A. M. Kowal;M. Kowal;T. Kowalski;M. Przybycien;L. Suszycki;D. Szuba;J. Szuba;A. Kotanski;W. Slominski;L. A. T.;U. Behrens;I. Bloch;K. Borras;V. Chiochia;D. Dannheim;M. Derrick;G. Drews;J. Fourletova;A. Fox-Murphy;U. Fricke;A. Geiser;F. Goebel;P. Gottlicher;O. Gutsche;T. Haas;W. Hain;G. F. Hartner;S. Hillert;U. Kotz;H. Kowalski;G. Kramberger;H. Labes;D. Lelas;B. Lohr;R. Mankel;I. A. Melzer-Pellmann;M. Moritz;D. Notz;M. C. Petrucci;A. Polini;A. Raval;U. Schneekloth;F. Selonke;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;M. Bell;P. Bussey;A. T. Doyle;C. Glasman;J. Hamilton;S. Hanlon;S. W. Lee;A. Lupi;D. H. Saxon;I. O. Skillicorn;I. Gialas;B. Bodmann;T. Carli;U. Holm;K. Klimek;N. Krumnack;E. Lohrmann;M. Milite;H. Salehi;S. Stonjek;K. Wick;A. Ziegler;A. Ziegler;C. Collins-Tooth;C. Foudas;R. Goncalo;K. R. Long;F. Metlica;A. D. Tapper;P. Cloth;D. Filges;M. Kuze;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;A. 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;E. Tassi;J. Terron;M. Vazquez;M. Barbi;A. Bertolin;F. Corriveau;S. Gliga;J. Lainesse;S. Padhi;D. G. Stairs;T. Tsurugai;A. Antonov;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;A. Pellegrino;S. Schagen;H. Tiecke;N. Tuning;J. J. Velthuis;L. Wiggers;E. d. Wolf;N. Brummer;B. Bylsma;L. S. Durkin;T. Y. Ling;S. Boogert;A. M. Cooper-Sarkar;R. C. E.;J. Ferrando;G. Grzelak;T. Matsushita;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;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;C. Heusch;I. H. Park;N. Pavel;H. Abramowicz;A. Gabareen;S. Kananov;A. Kreisel;A. Levy;T. Abe;T. Fusayasu;S. Kagawa;T. Kohno;T. Tawara;T. Yamashita;R. Hamatsu;T. Hirose;M. Inuzuka;S. Kitamura;K. Matsuzawa;T. Nishimura;M. Arneodo;M. Ferrero;V. Monaco;M. Ruspa;R. Sacchi;A. Solano;R. Galea;T. Koop;G. M. Levman;J. F. Martin;A. Mirea;A. Sabetfakhri;J. M. Butterworth;C. Gwenlan;R. Hall-Wilton;T. W. Jones;M. S. Lightwood;B. J. West;J. Ciborowski;R. Ciesielski;R. J. Nowak;J. M. Pawlak;B. Smalska;J. Sztuk;T. Tymieniecka;A. Ukleja;J. Ukleja;A. F. Zarnecki;M. Adamus;P. Plucinski;Y. Eisenberg;L. K. Gladilin;D. Hochman;U. Karshon;D. Kcira;S. Lammers;L. Li;D. D. Reeder;A. A. Savin;W. H. Smith;A. Deshpande;S. Dhawan;V. W. Hughes;P. B. Straub;S. Bhadra;C. D. Catterall;S. Fourletov;S. Menary;M. Soares;J. Standage
File in questo prodotto:
File Dimensione Formato  
820368.pdf

Accesso riservato

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 442.1 kB
Formato Adobe PDF
442.1 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/109566
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 41
  • ???jsp.display-item.citation.isi??? 42
social impact