Measurement Of The Gamma(B-B-Over-Bar)/Gamma(Had) Branching Ratio Of The Z By Double Hemisphere Tagging

P Abreu,W Adam,T Adye,E Agasi,I Ajinenko,R Aleksan,Gd Alekseev,Pp Allport,S Almehed, Fmi Almeida,Sj Alvsvaag,U Amaldi,A Andreazza,P Antilogus,Wd Apel,Rj Apsimon,Y Arnoud,B Asman,Je Augustin,A Augustinus,P Baillon,P Bambade,F Barao,R Barate,G Barbiellini,Dy Bardin,Gj Barker,A Baroncelli,O Barring,Ja Barrio,W Bartl,Mj Bates,M Battaglia,M Baubillier,J Baudot,Kh Becks,M Begalli,P Beilliere,Y Belokopytov,P Beltran,Ac Benvenuti,M Berggren,D Bertrand,F Bianchi,M Bigi,Ms Bilenky,P Billoir,J Bjarne,D Bloch,J Blocki,S Blyth,V Bocci,Pn Bogolubov,T Bolognese,M Bonesini,W Bonivento,Psl Booth,G Borisov,C Bosio,B Bostjancic,S Bosworth,O Botner,B Bouquet,C Bourdarios,Tjv Bowcock,M Bozzo,S Braibant,P Branchini,Kd Brand,Ra Brenner,H Briand,C Bricman,L Brillault,Rca Brown,P Bruckman,Jm Brunet,L Bugge,T Buran,A Buys,Jama Buytaert,M Caccia,M Calvi,Ajc Rozas,R Campion,T Camporesi,V Canale,K Cankocak,F Cao,F Carena,P Carrilho,L Carroll,R Cases,C Caso,Mvc Gimenez,A Cattai,Fr Cavallo,L Cerrito,V Chabaud,A Chan,P Charpentier,L Chaussard,J Chauveau,P Checchia,Ga Chelkov,P Chliapnikov,V Chorowicz,Jtm Chrin,V Cindro,P Collins,Jl Contreras,R Contri,E Cortina,G Cosme,F Couchot,Hb Crawley,D Crennell,G Crosetti,Jc Maestro,S Czellar,E Dahljensen,J Dahm,B Dalmagne,M Dam,G Damgaard,E Daubie,A Daum,Pd Dauncey,M Davenport,J Davies,W Dasilva,C Defoix,P Delpierre,N Demaria,A Deangelis,H Deboeck,W Deboer,S Debrabandere,C Declercq, Mdmf Laso,C Delavaissiere,B Delotto,A Demin,L Depaula,C Desaintjean,H Dijkstra,L Diciaccio,F Djama, F Dolbeau,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,Jp Engel,N Ershaidat,Me Santo,D Fassouliotis,M Feindt,A Fenyuk,A Ferrer,Ta Filippas,A Firestone,H Foeth,E Fokitis,F Fontanelli,F Formenti,Jl Fousset,B Franek,P Frenkiel,Dc Fries,Ag Frodesen,R Fruhwirth,F Fuldaquenzer,H Furstenau,J Fuster,D Gamba,M Gandelman,C Garcia,J Garcia,C Gaspar,U Gasparini,P Gavillet,En Gazis,D Gele,Jp Gerber,P Giacomelli,D Gillespie,R Gokieli,B Golob,Vm Golovatyuk, Jj 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,Fj Harris,V Hedberg,R Henriques,Jj Hernandez,Ja Hernando,P Herquet,H Herr,Tl Hessing,E Higon,Hj Hilke,Ts Hill,So Holmgren,Pj Holt,D Holthuizen,Pf Honore,M Houlden, H Hrubec,K Huet,K Hultqvist, P Ioanou,Ps Iversen,Jn Jackson,R Jacobsson,P Jalocha,G Jarlskog,P Jarry,B Jeanmarie,Ek Johansson,M Jonker,L Jonsson,P Juillot,M Kaiser,G Kalmus,F Kapusta,M Karlsson,E Karvelas,S Katsanevas,Ec Katsoufis,R Keranen,Ba Khomenko,Nn Khovanski,B King,Nj Kjaer,H Klein,A Klovning,P Kluit,A Kochmehrin,Jh Koehne,B Koene,P Kokkinias,M Koratzinos,Av Korytov,V Kostioukhine,C Kourkoumelis,O Kouznetsov,Ph Kramer,M Krammer,C Kreuter,J Krolikowski,I Kronkvist,W Krupinski,W Kucewicz,K Kulka,K Kurvinen,C Lacasta,I Laktineh,C Lambropoulos,Jw Lamsa,L Lanceri,P Langefeld,V Lapin,I Last,Jp Laugier,R Lauhakangas,G Leder,F Ledroit,R Leitner,Y Lemoigne,J Lemonne,G Lenzen,V Lepeltier,T Lesiak,Jm Levy,E Lieb,D Liko,R Lindner,A Lipniacka,I Lippi,B Loerstad,M Lokajicek,Jg Loken,A Lopezfernandez,Mal Aguera,M Los,D Loukas,Jj Lozano,P Lutz,L Lyons,G Maehlum,J Maillard,A Maio,A Maltezos,J Marco,B Marechal,M Margoni,Jc Marin,C Mariotti,A Markou,T Maron,S Marti,C Martinezrivero,F Martinezvidal,F Matorras,C Matteuzzi,G Matthiae,M Mazzucato, Mm Cubbin, Rm Mckay, Rm Mcnulty,J Medbo,C Meroni,Wt Meyer,M Michelotto,E Migliore,I Mikulec,L Mirabito,Wa Mitaroff,Gv Mitselmakher,U Mjoernmark,T Moa,R Moeller,K Moenig,Mr Monge,P Morettini,H Mueller,Wj Murray,B Muryn,G Myatt,F Naraghi,Fl Navarria,P Negri,S Nemecek,W Neumann,N Neumeister,R Nicolaidou,Bs Nielsen,V Nikolaenko,P Niss,A Nomerotski,A Normand,V Obraztsov,Ag Olshevski,R Orava,K Osterberg,A Ouraou,P Paganini,M Paganoni,R Pain,H Palka,Td 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,Ht Phillips,G Piana,F Pierre,M Pimenta,S Plaszczynski,O Podobrin,Me Pol,G Polok,P Poropat,V Pozdniakov,M Prest,P Privitera,A Pullia,D Radojicic,S Ragazzi,H Rahmani,J Rames,Pn Ratoff,Al Read,M Reale,P Rebecchi,Ng Redaelli,M Regler, Pb Reid,Pb Renton,Lk Resvanis,F Richard,J Richardson,J Ridky,G Rinaudo,I Ripp,A Romero,I Roncagliolo,P Ronchese,V Ronjin,L Roos,Ei Rosenberg,E Rosso,P Roudeau,T Rovelli,W Ruckstuhl,V Ruhlmannkleider,A Ruiz,H Saarikko,Y Sacquin,G Sajot,J Salt,J Sanchez,M Sannino,S Schael,H Schneider,Mae Schyns,G Sciolla,F Scuri,Am Segar,A Seitz,R Sekulin,M Sessa,R Seufert,Rc Shellard,I Siccama,P Siegrist,S Simonetti,F Simonetto,An Sisakian,Tb Skaali,G Smadja,N Smirnov,O Smirnova,Gr Smith,R Sosnowski,D Souzasantos,T Spassov,E Spiriti,S Squarcia,H Staeck,C Stanescu, D Stapnes, L 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,Ge Theodosiou,Z Thome,A Tilquin,J Timmermans,Vg Timofeev,Lg Tkatchev,T Todorov,Dz Toet,A Tomaradze,B Tome,E Torassa,L Tortora,G Transtromer,D Treille,G Tristram,C Troncon,A Tsirou,En Tsyganov,Ml Turluer,T Tuuva, La Tyapkin,M Tyndel,S Tzamarias,B Ueberschaer,S Ueberschaer,O Ullaland,V Uvarov,G Valenti,E Vallazza,Jav Ferrer,Cv Velde,Gw Vanapeldoorn,P Vandam,M Vanderheijden,Wk Vandoninck,J Vaneldik,P Vaz,G Vegni,L Ventura,W Venus,F Verbeure,M Verlato,Ls Vertogradov,D Vilanova,P Vincent,L Vitale,E Vlasov,As Vodopyanov,M Vollmer,M Voutilainen,V Vrba,H Wahlen,C Walck,F Waldner,A Wehr,M Weierstall,P Weilhammer,Am Wetherell,Jh Wickens,M Wielers,Gr Wilkinson,Wsc 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,Ni Zimin,M Zito,D Zontar,R Zuberi,G Zumerle

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1995）

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摘要

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

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