Measurement Of The Forward-Backward Asymmetry Of Charm And Bottom Quarks At The Z-Pole Using D-Asterisk(+/-)-Mesons

P Abreu,W Adam,T Adye,E Agasi,I Ajinenko,R Aleksan,Gd Alekseev,Pp Allport,S Almehed, Fml Almeida,Sj Alvsvaag,U Amaldi,A Andreazza,Ml Andrieux,P Antilogus,Wd Apel,Y Arnoud,B Asman,Je Augustin,A Augustinus,P Baillon,P Bambade,F Barao,R Barate,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,M Blume,S Blyth,V Bocci,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,P Branchini,Kd Brand,Ra Brenner,H Briand,C Bricman,L Brillault,Rca Brown,P Bruckman,Jm Brunet,L Bugge,T Buran,A Buys,M Caccia,M Calvi,Ajc Rozas,T Camporesi,V Canale,M Canepa,K Cankocak,F Cao,F Carena,P Carrilho,L Carroll, V 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,P Chochula,V Chorowicz,Jtm Chrin,V Cindro,P Collins,Jl Contreras,R Contri,E Cortina,G Cosme,F Cossutti,F Couchot,Hb Crawley,D Crennell,G Crosetti,Jc Maestro,S Czellar,E Dahljensen,J Dahm,B Dalmagne,M Dam,G Damgaard,A Daum,Pd Dauncey,M Davenport,W Dasilva,C Defoix,G Dellaricca,P Delpierre,N Demaria,A Deangelis,H Deboeck,W Deboer,S Debrabandere,C Declercq,Mdmd Laso, Cd Vaissiere,B Delotto,A Demin,L Depaula,C Desaintjean,H Dijkstra,L Diciaccio,F Djama,J Dolbeau,M Donszelmann,K Doroba,M Dracos,J Drees,Ka 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,D Gillespie,R Gokieli,B Golob,Jjgy 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,J Hrubec,K Huet,K Hultqvist,P Ioannou,Ps Iversen,Jn Jackson,R Jacobsson,P Jalocha,R Janik,G Jarlskog,P Jarry,B Jeanmarie,Ek Johansson,L Jonsson,P Juillot,M Kaiser,G Kalmus,F Kapusta,M Karlsson,E Karvelas,A Katargin,S Katsanevas,Ec Katsoufis,R Keranen,Ba Khomenko,Nn Khovanski,B King,Nj Kjaer,H Klein,A Klovning,P Kluit,Jh Koehne,B Koene,P Kokkinias,M Koratzinos,V Kostioukhine,C Kourkoumelis,O Kouznetsov,Ph Kramer,M Krammer,C Kreuter,J Krolikowski,I Kronkvist,Z Krumstein,W Krupinski,P Kubinec,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,V Lefebure,R Leitner, Ncy Lemoigne,J Lemonne,G Lenzen,V Lepeltier,T Lesiak,Jm Levy,D Liko,R Lindner,A Lipniacka,I Lippi,B Loerstad,M Lokajicek,Jg Loken,A Lopezfernandez,Mal Aguera,D Loukas,Jj Lozano,P Lutz,L Lyons,G Maehlum,J Maillard,A Maio,A Maltezos,V Malychev,F Mandl,J Marco,B Marechal,M Margoni,Jc Marin,C Mariotti,A Markou,T Maron,C Martinezrivero,F Martinezvidal,Smi Garcia,F Matorras,C Matteuzzi,G Matthiae,M Mazzucato,M Mccubbin,R Mckay,R Mcnulty,J Medbo,C Meroni,Wt Meyer,M Michelotto,E Migliore,I Mikulec,L Mirabito,Wa Mitaroff,U Mjoernmark,T Moa,R Moeller,K Moenig,Mr Monge,P Morettini,H Mueller,Wj Murray,B Muryn,G Myatt,F Naraghi,Fl Navarria,S Navas,P Negri,S Nemecek,W Neumann,N Neumeister,R Nicolaidou,Bs Nielsen,V Nikolaenko,P Niss,A Nomerotski,A Normand,W Oberschultebeckmann,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,A Perrotta,C Petridou,A Petrolini,Ht 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Toet,A Tomaradze,B Tome,E Torassa,L Tortora,G Transtromer,D Treille,W Trischuk,G Tristram,C Troncon,A Tsirou,Ml Turluer,T Tuuva,Ia Tyapkin,M Tyndel,S Tzamarias,B Ueberschaer,S Ueberschaer,O Ullaland,G Valenti,E Vallazza,Jav Ferrer,C Vandervelde,Gw Vanapeldoorn,P Vandam,Wk Vandoninck,J Vaneldik,G Vegni,L Ventura,W Venus,F Verbeure,M Verlato,Ls Vertogradov,D Vilanova,P Vincent,L Vitale,E Vlasov,As Vodopyanov,M Voutilainen,V Vrba,H Wahlen,C Walck,F Waldner,A Wehr,M Weierstall,P Weilhammer,Am Wetherell,D Wicke,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,Gc Zucchelli,G Zumerle

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1995）

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摘要

The forward-backward asymmetries for the processes e(+)e(-) --> c (c) over bar and e(+)e(-) --> b (b) over bar at the Z resonance are measured using identified D*(+/-) mesons. In 905,000 selected hadronic events, taken in 1991 and 1992 with the DELPHI detector at LEP, 4757 D*(+) --> D degrees pi(+) decays are reconstructed. The c and b quark forward-backward asymmetries are determined to be: A(FB)(c (c) over bar) = 0.077 +/- 0.029 (stat) +/- 0.012 (sys), A(FB)(b (b) over bar) = 0.059 +/- 0.062 (stat) +/- 0.025 (sys). Constraining the b asymmetry to the value measured by DELPHI using independent analyses, the charm asymmetry is determined to be: A(FB)(c,const) = 0.068 +/- 0.027 (stat) +/- 0.011 (sys). This result corresponds to an effective electroweak mixing angle measured using charm quark events of: sin2 theta(eff)(lept) = 0.2307 +/- 0.0062 (stat) +/- 0.0026 (sys).

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Field Theory, Elementary Particle, Quantum Field Theory, Particle Acceleration, Independent Analysis

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