Measurement of the $$\Gamma _{b\bar b} /\Gamma _{had} $$ branching ratio of thez by double hemisphere tagging

P. Abreu,W. Adam,T. Adye,E. Agasi,I. Ajinenko,R. Aleksan,G. D. Alekseev,P. P. Allport,S. Almehed,F. M. L. Almeida,S. J. Alvsvaag,U. Amaldi,A. Andreazza,P. Antilogus,W. D. Apel,R. J. Apsimon,Y. Arnoud,B. Asman,J. E. Augustin,A. Augustinus,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,Yu. Belokopytov,P. Beltran,A. C. Benvenuti,M. Berggren,D. Bertrand,F. Bianchi,M. Bigi,M. S. Bilenky,P. Billoir,J. Bjarne,D. Bloch,J. Blocki,S. Blyth,V. Bocci,P. N. Bogolubov,T. Bolognese,M. Bonesini,W. Bonivento,P. S. L. Booth,G. Borisov,C. Bosio,B. Bostjancic,S. Bosworth,O. Botner,B. Bouquet,C. Bourdarios,T. J. V. Bowcock,M. Bozzo,S. Braibant,P. Branchini,K. D. Brand,R. A. Brenner,H. Briand,C. Bricman,L. Brillault,R. C. A. Brown,P. Bruckman,J. M. Brunet,L. Bugge,T. Buran,A. Buys,J. A. M. A. Buytaert,M. Caccia,M. Calvi,A. J. Camacho Rozas,R. Campion,T. Camporesi,V. Canale,K. Cankocak,F. Cao,F. Carena,P. Carrilho,L. Carroll,R. Cases,C. Caso,M. V. Castillo Gimenez,A. Cattai,F. R. Cavallo,L. Cerrito,V. Chabaud,A. Chan,Ph. Charpentier,L. Chaussard,J. Chauveau,P. Checchia,G. A. Chelkov,P. Chliapnikov,V. Chorowicz,J. T. M. Chrin,V. Cindro,P. Collins,J. L. Contreras,R. Contri,E. Cortina,G. Cosme,F. Couchot,H. B. Crawley,D. Crennell,G. Crosetti,J. Cuevas Maestro,S. Czellar,E. Dahl-Jensen,J. Dahm,B. Dalmagne,M. Dam,G. Damgaard,E. Daubie,A. Daum,P. D. Dauncey,M. Davenport,J. Davies,W. Da Silva,C. Defoix,P. Delpierre,N. Demaria,A. De Angelis,H. De Boeck,W. De Boer,S. De Brabandere,C. De Clercq,M. D. M. De Fez Laso,C. De La Vaissiere,B. De Lotto,A. De Min,L. De Paula,C. De Saint-Jean,H. Dijkstra,L. Di Ciaccio,F. Djama,J. Dolbeau,M. Donszelmann,K. Doroba,M. Dracos,J. Drees,M. Dris,Y. Dufour,F. Dupont,D. Edsall,R. Ehret,T. Ekelof,G. Ekspong,M. Elsing,J. P. Engel,N. Ershaidat,M. Espirito Santo,D. Fassouliotis,M. Feindt,A. Fenyuk,A. Ferrer,T. A. Fillippas,A. Firestone,H. Foeth,E. Fokitis,F. Fontanelli,F. Formenti,J. L. Fousset,B. Franek,P. Frenkiel,D. C. Fries,A. G. Frodesen,R. Fruhwirth,F. Fulda-Quenzer,H. Furstenau,J. Fuster,D. Gamba,M. Gandelman,C. Garcia,J. Garcia,C. Gaspar,U. Gasparini,Ph. Gavillet,E. N. Gazis,D. Gele,J. P. Gerber,P. Giacomelli,D. Gillespie,R. Gokieli,B. Golob,V. M. Golovatyuk,J. J. Gomez Y Cadenas,G. Gopal,L. Gorn,M. Gorski,V. Gracco,F. Grard,E. Graziani,G. Grosdidier,P. Gunnarsson,J. Guy,U. Haedinger,F. Hahn,M. Hahn,S. Hahn,S. Haider,Z. Hajduk,A. Hakansson,A. Hallgren,K. Hamacher,W. Hao,F. J. Harris,V. Hedberg,R. Henriques,J. J. Hernandez,J. A. Hernando,P. Herquet,H. Herr,T. L. Hessing,E. Higon,H. J. Hilke,T. S. Hill,S. O. Holmgren,P. J. Holt,D. Holthuizen,P. F. Honore,M. Houlden,J. Hrubec,K. Huet,K. Hultqvist,P. Ioannou,P. S. Iversen,J. N. Jackson,R. Jacobsson,P. Jalocha,G. Jarlskog,P. Jarry,B. Jean-Marie,E. K. Johansson,M. Jonker,L. Jonsson,P. Juillot,M. Kaiser,G. Kalmus,F. Kapusta,M. Karlsson,E. Karvelas,S. Katsanevas,E. C. Katsoufis,R. Keranen,B. A. Khomenko,N. N. Khovanski,B. King,N. J. Kjaer,H. Klein,A. Klovning,P. Kluit,A. Koch-Mehrin,J. H. Koehne,B. Koene,P. Kokkinias,M. Koratzinos,A. V. Korytov,V. Kostioukhine,C. Kourkoumelis,O. Kouznetsov,P. H. Kramer,M. Krammer,C. Kreuter,J. Krolikowski,I. Kronkvist,W. Krupinski,W. Kucewicz,K. Kulka,K. Kurvinen,C. Lacasta,I. Laktineh,C. Lambropoulos,J. W. Lamsa,L. Lanceri,P. Langefeld,V. Lapin,I. Last,J. P. Laugier,R. Lauhakangas,G. Leder,F. Ledroit,R. Leitner,Y. Lemoigne,J. Lemonne,G. Lenzen,V. Lepeltier,T. Lesiak,J. M. Levy,E. Lieb,D. Liko,R. Lindner,A. Lipniacka,I. Lippi,B. Loerstad,M. Lokajicek,J. G. Loken,A. Lopez-Fernandez,M. A. Lopez Aguera,M. Los,D. Loukas,J. J. Lozano,P. Lutz,L. Lyons,G. Maehlum,J. Maillard,A. Maio,A. Maltezos,J. Marco,B. Marechal,M. Margoni,J. C. Marin,C. Mariotti,A. Markou,T. Maron,S. Marti,C. Martinez-Rivero,F. Martinez-Vidal,F. Matorras,C. Matteuzzi,G. Matthiae,M. Mazzucato,M. Mc. Cubbin,R. Mc Kay,R. Mc Nulty,J. Medbo,C. Meroni,W. T. Meyer,M. Michelotto,E. Migliore,I. Mikulec,L. Mirabito,W. A. Mitaroff,G. V. Mitselmakher,U. Mjoernmark,T. Moa,R. Moeller,K. Moenig,M. R. Monge,P. Morettini,H. Mueller,W. J. Murray,B. Muryn,G. Myatt,F. Naraghi,F. L. Navarria,P. Negri,S. Nemecek,W. Neumann,N. Neumeister,R. Nicolaidou,B. S. Nielsen,V. Nikolaenko,P. Niss,A. Nomerotski,A. Normand,V. Obraztsov,A. G. Olshevski,R. Orava,K. Osterberg,A. Ouraou,P. Paganini,M. Paganoni,R. Pain,H. Palka,Th. D. Papadopoulou,L. Pape,F. Parodi,A. Passeri,M. Pegoraro,J. Pennanen,L. Peralta,V. Perevozchikov,H. Pernegger,M. Pernicka,A. Perrotta,C. Petridou,A. Petrolini,H. T. Phillips,G. Piana,F. Pierre,M. Pimenta,S. Plaszczynski,O. Podobrin,M. E. Pol,G. Polok,P. Poropat,V. Pozdniakov,M. Prest,P. Privitera,A. Pullia,D. Radojicic,S. Ragazzi,H. Rahmani,J. Rames,P. N. Ratoff,A. L. Read,M. Reale,P. Rebecchi,N. G. Redaelli,M. Regler,D. Reid,P. B. Renton,L. K. Resvanis,F. Richard,J. Richardson,J. Ridky,G. Rinaudo,I. Ripp,A. Romero,I. Roncagliolo,P. Ronchese,V. Ronjin,L. Roos,E. I. Rosenberg,E. Rosso,P. Roudeau,T. Rovelli,W. Ruckstuhl,V. Ruhlmann-Kleider,A. Ruiz,H. Saarikko,Y. Sacquin,G. Sajot,J. Salt,J. Sanchez,M. Sannino,S. Schael,H. Schneider,M. A. E. Schyns,G. Sciolla,F. Scuri,A. M. Segar,A. Seitz,R. Sekulin,M. Sessa,R. Seufert,R. C. Shellard,I. Siccama,P. Siegrist,S. Simonetti,F. Simonetto,A. N. Sisakian,T. B. Skaali,G. Smadja,N. Smirnov,O. Smirnova,G. R. Smith,R. Sosnowski,D. Douza-Santos,T. Spassov,E. Spiriti,S. Squarcia,H. Staeck,C. Stanescu,S. Stapnes,I. Stavitski,G. Stavropoulos,K. Stepaniak,F. Stichelbaut,A. Stocchi,J. Strauss,J. Straver,R. Strub,B. Stugu,M. Szczekowski,M. Szeptycka,T. Tabarelli,O. Tchikilev,G. E. Theodosiou,Z. Thome,A. Tilquin,J. Timmermans,V. G. Timofeev,L. G. Tkatchev,T. Todorov,D. Z. Toet,A. Tomaradze,B. Tome,E. torassa,L. Tortora,G. Transtromer,D. Treille,G. Tristram,C. Troncon,A. Tsirou,E. N. Tsyganov,M. L. Turluer,T. Tuuva,I. A. Tyapkin,M. Tyndel,S. Tzamarias,B. Ueberschaer,S. Ueberschaer,O. Ullaland,V. Uvarov,G. Valenti,E. Vallazza,J. A. Valls Ferrer,C. Vander Velde,G. W. Van Apeldoorn,P. Van Dam,M. Van Der Heijden,W. K. Van Doninck,J. Van Eldik,P. Vaz,G. Vegni,L. Ventura,W. Venus,F. Verbeure,M. Verlato,L. S. Vertogradov,D. Vilanova,P. Vincent,L. Vitale,E. Vlasov,A. S. Vodopyanov,M. Vollmer,M. Voutilainen,V. Vrba,H. Wahlen,C. Walck,F. Waldner,A. Wehr,M. Weierstall,P. Weilhammer,A. M. Wetherell,J. H. Wickens,M. Wielers,G. R. Wilkinson,W. S. C. Williams,M. Winter,M. Witek,G. Wormser,K. Woschnagg,K. Yip,O. Yushchenko,F. Zach,A. Zaitsev,A. Zalewska,P. Zalewski,D. Zavrtanik,E. Zevgolatakos,N. I. Zimin,M. Zito,D. Zontar,R. Zuberi,G. Zumerle

European Physical Journal C(1995)

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摘要
Two measurements of 
$$\Gamma _{b\bar b} /\Gamma _{had} $$
are presented. Both measurements use 250000Z decays taken with the DELPHI detector in 1991 and rely mainly on the precision of the microvertex detector. One tagging method is as simple as possible so that background rates can be reliably predicted by simulation. The other one uses a more involved tagging technique and reduces the dependence on simulation as much as possible. Combining both results, 
$$\Gamma _{b\bar b} /\Gamma _{had} $$
is found to be 0.2209±0.0041(stat.)±0.0042(syst.)±0.0018 
$$\Gamma _{c\bar c} $$
.
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