Measurement of the 
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. 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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）
引用 9|浏览255
摘要
Two measurements of
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,
is found to be 0.2209±0.0041(stat.)±0.0042(syst.)±0.0018
.
更多 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,
is found to be 0.2209±0.0041(stat.)±0.0042(syst.)±0.0018
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