Study of inclusive J/psi production in two-photon collisions at LEP II with the DELPHI detector
Articolo
Data di Pubblicazione:
2003
Abstract:
Inclusive J/psi production in photon-photon collisions has been observed at LEP II beam energies. A clear signal from the reaction gammagamma --> J/psi + X is seen. The number of observed N(J/psi --> mu(+)mu(-)) events is 36+/-7 for an integrated luminosity of 617 pb(-1), yielding a cross-section of sigma(J/psi + X) = 45+/-9(stat) +/- 17(syst) pb. Based on a study of the event shapes of different types of gammagamma processes in the PYTHIA program, we conclude that (74+/-22) % of the observed J/psi events are due to 'resolved' photons, the dominant contribution of which is most probably due to the gluon content of the photon. (C) 2003 Published by Elsevier B.V.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
J. Abdallah;P. Abreu;W. Adam;P. Adzic;T. Albrecht;T. Alderweireld;R. Alemany-Fernandez;T. Allmendinger;P. P. Allport;S. Almehed;U. Amaldi;N. Amapane;S. Amato;E. Anashkin;A. Andreazza;S. Andringa;N. Anjos;P. Antilogus;W. D. Apel;Y. Arnoud;S. Ask;B. Asman;J. E. Augustin;A. Augustinus;P. Baillon;A. Ballestrero;P. Bambade;R. Barbier;D. Bardin;G. Barker;A. Baroncelli;M. Battaglia;M. Baubillier;K. H. Becks;M. Begalli;A. Behrmann;T. Bellunato;K. Belous;N. Benekos;A. Benvenuti;C. Berat;M. Berggren;L. Berntzon;D. Bertrand;M. Besancon;N. Besson;D. Bloch;M. Blom;M. Bonesini;M. Boonekamp;P. S. L.;G. Borisov;O. Botner;B. Bouquet;T. Bowcock;I. Boyko;M. Bracko;R. Brenner;E. Brodet;P. Bruckman;J. M. Brunet;L. Bugge;P. Buschmann;M. Calvi;T. Camporesi;V. Canale;F. Carena;C. Carimalo;N. Castro;F. Cavallo;M. Chapkin;P. Charpentier;P. Checchia;R. Chierici;P. Chliapnikov;K. Chung;K. Cieslik;P. Collins;R. Contri;G. Cosme;F. Cossutti;M. J. Costa;B. Crawley;D. Crennell;J. Cuevas;J. D'Hondt;J. Dalmau;T. d. Silva;W. D. Silva;G. D. Ricca;A. D. Angelis;W. D. Boer;C. D. Clercq;B. D. Lotto;N. D. Maria;A. D. Min;L. d. Paula;L. D. Ciaccio;A. D. Simone;K. Doroba;J. Drees;M. Dris;G. Eigen;T. Ekelof;M. Ellert;M. Elsing;M. C. E.;G. Fanourakis;D. Fassouliotis;M. Feindt;J. Fernandez;A. Ferrer;F. Ferro;U. Flagmeyer;H. Foeth;E. Fokitis;F. Fulda-Quenzer;J. Fuster;M. Gandelman;C. Garcia;P. Gavillet;E. Gazis;D. Gele;T. Geralis;R. Gokieli;B. Golob;G. Gomez-Ceballos;P. Goncalves;E. Graziani;G. Grosdidier;K. Grzelak;J. Guy;C. Haag;F. Hahn;S. Hahn;A. Hallgren;K. Hamacher;K. Hamilton;J. Hansen;S. Haug;F. Hauler;V. Hedberg;M. Hennecke;H. Herr;S. O. Holmgren;P. J. Holt;M. A. Houlden;K. Hultqvist;J. N. Jackson;C. Jarlskog;G. Jarlskog;P. Jarry;D. Jean;E. K. Johansson;P. D. Johansson;P. Jonsson;C. Joram;L. Jungermann;F. Kapusta;S. Katsanevas;E. Katsoufis;R. Keranen;G. Kernel;B. P. Kersevan;A. Kiiskinen;B. T. King;N. J. Kjaer;P. Kluit;P. Kokkinias;C. Kourkoumelis;O. Kouznetsov;Z. Krumstein;M. Kucharczyk;J. Kurowska;B. Laforge;J. Lamsa;G. Leder;F. Ledroit;L. Leinonen;R. Leitner;J. Lemonne;G. Lenzen;V. Lepeltier;T. Lesiak;W. Liebig;D. Liko;A. Lipniacka;J. H. Lopes;J. M. Lopez;D. Loukas;P. Lutz;L. Lyons;J. MacNaughton;A. Malek;S. Maltezos;F. Mandl;J. Marco;R. Marco;B. Marechal;M. Margoni;J. C. Marin;C. Mariotti;A. Markou;C. Martinez-Rivero;J. Masik;N. Mastroyiannopoulos;F. Matorras;C. Matteuzzi;F. Mazzucato;M. Mazzucato;R. M. Nulty;C. Meroni;W. T. Meyer;E. Migliore;W. Miraroff;U. Mjoernmark;T. Moa;M. Moch;K. Moenig;R. Monge;J. Montenegro;D. Moraes;S. Moreno;P. Morettini;U. Mueller;K. Muenich;M. Mulders;L. Mundim;W. Murray;B. Muryn;G. Myatt;T. Myklebust;M. Nassiakou;F. Navarria;K. Nawrocki;S. Nemecek;R. Nicolaidou;P. Niezurawski;M. Nikolenko;A. Nygren;O. Oblakowska-Mucha;V. Obraztsov;A. Olshevski;A. Onofre;R. Orava;K. Osterberg;A. Ouraou;A. Oyanguren;M. Paganoni;S. Paiano;J. P. Palacios;H. Palka;T. D. Papadopoulou;L. Pape;C. Parkes;F. Parodi;U. Parzefall;A. Passeri;O. Passon;L. Peralta;V. Perepelitsa;A. Perrotta;A. Petrolini;J. Piedra;L. Pieri;F. Pierre;M. Pimenta;E. Piotto;T. Podobnik;V. Poireau;M. E. Pol;G. Polok;P. Poropat;V. Pozdniakov;P. Privitera;N. Pukhaeva;A. Pullia;J. Rames;L. Ramler;A. Read;P. Rebecchi;J. Rehn;D. Reid;R. Reinhardt;P. Renton;F. Richard;J. Ridky;I. Ripp-Baudot;D. Rodriguez;A. Romero;P. Ronchese;E. Rosenberg;P. Roudeau;T. Rovelli;V. Ruhlmann-Kleider;D. Ryabtchikov;A. Sadovsky;L. Salmi;J. Salt;A. Savoy-Navarro;C. Schwanda;B. Schwering;U. Schwickerath;A. Segar;R. Sekulin;M. Siebel;A. Sisakian;G. Smadja;O. Smirnova;A. Sokolov;A. Sopczak;R. Sosnowski;T. Spassov;M. Stanitzki;A. Stocchi;J. Strauss;B. Stugu;M. Szczekowski;M. Szeptycka;T. Szumlak;T. Taba
Link alla scheda completa:
Pubblicato in: