Data di Pubblicazione:
1997
Abstract:
In a sample of 3.02 million hadronic Z(0) decays collected by the DELPHI detector, 270 J/psi --> e(+)e(-) candidates have been selected. A search for fully reconstructed B-c(+/-) mesons has yielded one B-c(+/-) --> J/psi pi(+/-) candidate, no B-c(+/-) --> J/psi e(+/-) nu(e) candidates, and one B-c(+/-) --> J/psi pi(+)pi(-)pi(+) candidate, consistent with expected background in each channel. The following 90% confidence level upper limits ate determined: Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)) < (1.05 to 0.84) x 10(-4) and Br(Z(d) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi e(+/-) nu(e)) < (5.8 to 5.0) x 10(-5), where the ranges quoted correspond to the range of predicted B-c(+/-) lifetimes from 0.4 to 1.4 ps, and Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)pi(-)pi(+/-)) < 1.75 x 10(-4), constant over the range of predicted B-c(+/-) lifetimes. (C) 1997 Elsevier Science B.V.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
P. Abreu;W. Adam;T. Adye;I. Ajinenko;G. D. Alekseev;R. Alemany;P. P. Allport;S. Almehed;U. Amaldi;S. Amato;A. Andreazza;M. L. Andrieux;P. Antilogus;W. D. Apel;B. Asman;J. E. Augustin;A. Agustinus;P. Baillon;P. Bambade;F. Barao;M. Barbi;G. Barbiellini;D. Y. Bardin;G. 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. Bertini;D. Bertrand;M. Besancon;F. Bianchi;M. Bigi;M. S. Bilenky;P. Billoir;M. A. Bizouard;D. Bloch;M. Blume;T. Bolognese;M. Bonesini;W. Bonivento;P. S. L.;G. Borisov;C. Bosio;O. Botner;E. Boudinov;B. Bouquet;C. Bourdarios;T. J. V.;M. Bozzo;P. Branchini;K. D. Brand;T. Brenke;R. A. Brenner;C. Bricman;R. C. A.;P. Bruckman;J. M. Brunet;L. Bugge;T. Buran;T. Burgsmueller;P. Buschmann;S. Cabrera;M. Caccia;M. Calvi;A. J. C.;T. Camporesi;V. Canale;M. Canepa;K. Cankocak;F. Cao;F. Carena;L. Carroll;C. Caso;M. V. C.;A. Cattai;F. R. Cavallo;V. Chabaud;P. Charpentier;L. Chaussard;P. Checchia;G. A. Chelkov;M. Chen;R. Chierici;P. Chliapnikov;P. Chochula;V. Chorowicz;V. Cindro;P. Collins;R. Contri;E. Cortina;G. Cosme;F. Cossutti;J. H. Cowell;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;W. DeBoer;S. DeBrabandere;C. DeClercq;C. DelaVaissiere;B. DeLotto;A. DeMin;L. DePaula;C. DeSaintJean;H. Dijkstra;L. DiCiaccio;A. DiDiodato;F. Djama;A. Djannati;J. Dolbeau;K. Doroba;M. Dracos;J. Drees;K. A. Drees;M. Dris;J. D. Durand;D. Edsall;R. Ehret;G. Eigen;T. Ekelof;G. Ekspong;M. Elsing;J. P. Engel;B. Erzen;M. E. Santo;E. Falk;D. Fassouliotis;M. Feindt;A. Fenyuk;A. Ferrer;S. Fichet;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. Fruhwirth;F. FuldaQuenzer;J. Fuster;A. Galloni;D. Gamba;M. Gandelman;C. Garcia;J. Garcia;C. Gaspar;U. Gasparini;P. Gavillet;E. N. Gazis;D. Gele;J. P. Gerber;L. Gerdyukov;R. Gokieli;B. Golob;G. Gopal;L. Gorn;M. Gorski;Y. Gouz;V. Gracco;E. Graziani;C. Green;A. Grefrath;P. Gris;G. Grosdidier;K. Grzelak;S. Gumenyuk;P. Gunnarsson;M. Gunther;J. Guy;F. Hahn;S. Hahn;Z. Hajduk;A. Hallgren;K. Hamacher;F. J. Harris;V. Hedberg;R. Henriques;J. J. Hernandez;P. Herquet;H. Herr;T. L. Hessing;J. M. Heuser;E. Higon;H. J. Hilke;T. S. Hill;S. O. Holmgren;P. J. Holt;D. Holthuizen;S. Hoorelbeke;M. Houlden;J. Hrubec;K. Huet;K. Hultqvist;J. N. Jackson;R. Jacobsson;P. Jalocha;R. Janik;C. Jarlskog;G. Jarlskog;P. Jarry;B. JeanMarie;E. K. Johansson;L. Jonsson;P. Jonsson;C. Joram;P. Juillot;M. Kaiser;F. Kapusta;K. Karafasoulis;M. Karlsson;E. Karvelas;S. Katsanevas;E. C. Katsoufis;R. Keranen;Y. Khokhlov;B. A. Khomenko;N. N. Khovanski;B. King;N. J. Kjaer;O. Klapp;H. Klein;A. Klovning;P. Kluit;B. Koene;P. Kokkinias;M. Koratzinos;K. Korcyl;V. Kostioukhine;C. Kourkoumelis;O. Kouznetsov;M. Krammer;C. Kreuter;I. Kronkvist;Z. Krumstein;W. Krupinski;P. Kubinec;W. Kucewicz;K. Kurvinen;C. Lacasta;I. Laktineh;J. W. Lamsa;L. Lanceri;D. W. Lane;P. Langefeld;J. P. Laugier;R. Lauhakangas;G. Leder;F. Ledroit;V. Lefebure;C. K. Legan;R. Leitner;J. Lemonne;G. Lenzen;V. Lepeltier;T. Lesiak;J. Libby;D. Liko;R. Lindner;A. Lipniacka;I. Lippi;B. Loerstad;J. G. Loken;J. M. Lopez;D. Loukas;P. Lutz;L. Lyons;J. MacNaughton;G. Maehlum;J. R. Mahon;A. Maio;T. G. M.;V. Malychev;E. Mandl;J. Marco;R. Marco;B. Marechal;M. Margoni;J. C. Marin;C. Mariotti;A. Markou;C. MartinezRivero;F. MartinezVidal;S. M. Garcia;F. Matorras;C. Matteuzzi;G. Matthiae;M. Mazzucato;
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