A search has been made for direct production of heavy quarkonium states in more than 3 million hadronic Z(0) decays in the 1991-1994 DELPHI data, Prompt J/psi, psi(2S) and Upsilon candidates have been searched for through their leptonic decay modes using criteria based on the kinematics and decay vertex positions. New upper limits are set at the 90% confidence level for Br(Z(0) --> (Q (Q) over bar) X)/Br(Z(0) --> hadrons) for various strong production mechanisms of J/psi and Upsilon; these range down to 0.9 x 10(-4). The limits are set in the presence of a small excess (similar to 1% statistical probability of a background fluctuation) in the sum of candidates from prompt J/psi, psi(2S), Upsilon(1S), Upsilon(2S) and Upsilon(3S) relative to the estimated background.

Search for promptly produced heavy quarkonium states in hadronic Z decays

BIANCHI, Fabrizio;MIGLIORE, Ernesto;ROMERO, Alessandra;
1996-01-01

Abstract

A search has been made for direct production of heavy quarkonium states in more than 3 million hadronic Z(0) decays in the 1991-1994 DELPHI data, Prompt J/psi, psi(2S) and Upsilon candidates have been searched for through their leptonic decay modes using criteria based on the kinematics and decay vertex positions. New upper limits are set at the 90% confidence level for Br(Z(0) --> (Q (Q) over bar) X)/Br(Z(0) --> hadrons) for various strong production mechanisms of J/psi and Upsilon; these range down to 0.9 x 10(-4). The limits are set in the presence of a small excess (similar to 1% statistical probability of a background fluctuation) in the sum of candidates from prompt J/psi, psi(2S), Upsilon(1S), Upsilon(2S) and Upsilon(3S) relative to the estimated background.
1996
69
575
583
P. Abreu;W. Adam;T. Adye;E. Agasi;I. Ajinenko;R. Aleksan;G. D. Alekseev;P. P. Allport;S. Almehed;S. J. Alvsvaag;U. Amaldi;S. Amato;A. Andreazza;M. L. Andrieux;P. Antilogus;W. D. Apel;Y. Arnoud;B. Asman;A. Augustin;P. Baillon;P. Bambade;F. Barao;R. Barate;G. Barbiellini;D. Y. Bardin;G. J. Barker;A. Baroncelli;O. Barring;J. A. Barrio;W. Bartl;M. J. Bates;M. Battaglia;M. Baubillier;J. Baudot;K. H. Becks;M. Begalli;P. Beilliere;Y. Belokopytov;K. Belous;A. C. Benvenuti;M. Berggren;D. Bertrand;F. Bianchi;M. Bigi;M. S. Bilenky;P. Billoir;D. Bloch;M. Blume;S. Blyth;V. Bocci;T. Bolognese;M. Bonesini;W. Bonivento;P. S. L.;G. Borisov;C. Bosio;S. Bosworth;O. Botner;B. Bouquet;C. Bourdarios;T. J. V.;M. Bozzo;P. Banchini;K. D. Brand;T. Brenke;R. A. Brenner;C. Bricman;L. Brillault;R. C. A.;P. Bruckman;J. M. Brunet;L. Bugge;T. Buran;T. Burgsmueller;P. Buschmann;A. Buys;M. Caccia;M. Calvi;A. J. C.;T. Camporesi;V. Canale;M. Canepa;K. Cankocak;F. Cao;F. Carena;P. Carrilho;L. Carroll;C. Casco;M. V. C.;A. Cattai;F. R. Cavallo;L. Cerrito;V. Chabaud;P. Charpentier;L. Chaussard;J. Chauveau;P. Checchia;G. A. Chelkov;R. Chierici;P. Chliapnikov;P. Chochula;V. Chorowicz;V. Cindro;P. Collins;J. L. Contreras;R. Contri;E. Cortina;G. Cosme;F. Cossutti;H. B. Crawley;D. Crennell;G. Crosetti;J. C. Maestro;S. Czellar;E. DahlJensen;J. Dahm;B. Dalmagne;M. Dam;G. Damgaard;P. D. Dauncey;M. Davenport;W. DaSilva;C. Defoix;A. Deghorain;G. DellaRicca;P. Delpierre;N. Demaria;A. DeAngelis;H. DeBoeck;W. DeBoer;S. DeBrabandere;C. DeClercq;C. DeLaVaissiere;B. DeLotto;A. DeMin;L. DePaula;C. DeSaintJean;H. Dijkstra;L. DiCiaccio;F. Djama;J. Dolbeau;M. Donszelmann;K. Doroba;M. Dracos;J. Drees;K. A. Drees;M. Dris;Y. Dufour;F. Dupont;D. Edsall;R. Ehret;G. Eigen;T. Ekelof;G. Ekspong;M. Elsing;J. P. Engel;N. Ershaidat;B. Erzen;M. E. Santo;E. Falk;D. Fassouliotis;M. Feindt;A. Ferrer;T. A. Filippas;A. Firestone;P. A. Fischer;H. Foeth;E. Fokitis;F. Fontanelli;F. Formenti;B. Franek;P. Frenkiel;D. C. Fries;A. G. Frodesen;R. 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