Measurement of the forward-backward asymmetry of charm and bottom quarks at theZ pole usingD*± mesons
P. Abreu,W. Adam,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,M. L. Andrieux,P. Antilogus,W. D. Apel,Y. Arnoud,B. Åsman,J. E. Augustin,A. Augustinus,P. Baillon,P. Bambade,F. Barao,R. Barate,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,M. Blume,S. Blyth,V. Bocci,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,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,M. Caccia,M. Calvi,A. J. Camacho Rozas,T. Camporesi,V. Canale,M. Canepa,K. Cankocak,F. Cao,F. Carena,P. Carrilho,L. Carroll,C. Caso,V. Cassio,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,P. Chochula,V. Chorowicz,J. T. M. Chrin,V. Cindro,P. Collins,J. L. Contreras,R. Contri,E. Cortina,G. Cosme,F. Cossutti,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,A. Daum,P. D. Dauncey,M. Davenport,W. Da Silva,C. Defoix, G. Dellaricca,G. Della Ricca,P. Delpierre,N. Demaria,A. De Angelis,H. De Boeck,W. De Boer,S. De Brabandere,C. De Clereq,M. D. M. De Fez Laso,C. De La Vaissiere,B. De Lotto,A. De Min,A. De Paula,C. De Saint-Jean,H. Dijkstra,L. Di Ciaccio,F. Djama,J. Dolbeau,M. Donszelmann,K. Doroba,M. Dracos,J. Drees,K.-A. 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. Filippas,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,D. Gillespie,R. Gokieli,B. Golob,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,R. Janik,G. Jarlskog,P. Jarry,B. Jean-Marie,E. K. Johansson,L. Jonsson,P. Juillot,M. Kaiser,G. Kalmus,F. Kapusta,M. Karlsson,E. Karvelas,A. Katargin,S. Katsanevas,E. C. Katsoufis, R. Keranen,B. A. Khomenko,N. M. Khovanski,B. King,N. J. Kjaer,H. Klein,A. Klovning,P. Kluit,J. H. Koehne,B. Koene,P. Kokkinias,M. Koratzinos,V. Kostioukhine,C. Kourkoumelis,O. Kouznetsov,P.-H. 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,J. W. Lamsa,L. Lanccri,P. Langefeld,V. Lapin,I. Last,J. P. Laugier,R. Lauhakangas,G. Leder,F. Ledroit,V. Lefebure,R. LeitnerNC Y. Lemoigne,J. Lemonne, G. Lenzen,V. Lepeltier,T. Lesiak,J. M. Levy,D. Liko,R. Lindner,A. Lipniacka,I. Lippi,B. Loerstad,M. Lokajicek, J. G. Loken,A. Lopez-Fernandez,M. A. Lopez Aguera,D. Loukas,J. J. Lozano,P. Lutz,L. Lyons,G. Maehlum,J. Maillard,A. Maio,A. Maltezos,V. Malychev,F. Mandl,J. Marco,B. Marechal,M. Margoni,J. C. Marin,C. Mariotti,A. Markou,T. Maron,C. Martinez-Rivero,F. Martinez-Vidal,S. Marti i Garcia,F. Matorras,C. Matteuzzi,G. Matthiae,M. Mazzucato, M. Mc Kay,R. Mc Kay,R. Mc Nulty,J. Medbo,C. Meroni,W. T. Meyer,M. Michelotto,E. Migliore,I. Mikulec,L. Mirabito,W. A. Mitaroff,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,S. Navas,P. Negri,S. Nemecek,W. Neumann,N. Neumeister,R. Nicolaidou,B. S. Nielsen,V. Nikolaenko,P. Niss,A. Nomerotski,A. Normand,W. Oberschulte-Beckmann,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,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,A. Sadovsky,G. Sajot,J. Salt,J. Sanchez,M. Sannino,H. Schneider,M. A. E. Schyns,G. Sciolla,F. Scuri,Y. Sedykh,A. M. Segar,A. Seitz,R. Sekulin,R. C. Shellard,I. Siccama,P. Siegrist,S. Simonetti,F. Simonetto,A. N. Sisakian,B. Sitar,T. B. Skaali,G. Smadja,N. Smirnov,O. Smirnova,G. R. Smith,R. Sosnowski,D. Souza-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,R. Strub,B. Stugu,M. Szczekowski,M. Szeptycka,T. Tabarelli,O. Tchikilev,G. E. Theodosiou,Z. Thome,A. Tilquin,J. Timmermans,L. G. Tkatchev,T. Todorov,D. Z. Toet,A. Tomaradze,B. Tome,E. Torassa,L. Tortora,G. Transtromer,D. Treille,W. Trischuk,G. Tristram,C. Troncon,A. Tsirou,M. L. Turleur,T. Tuuva,I. A. Tyapkin,M. Tyndel,S. Tzamarias,B. Ueberschaer,S. Ueberschaer,O. Ullaland,G. Valenti,E. Vallazza,J. A. Valls Ferrer,C. Vander Velde,G. W. Van Apeldoorn,P. Van Dam,W. K. Van Doninck,J. Van Eldik,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. Voutilainen,V. Vrba,H. Wahlen,C. Walck,F. Waldner,A. Wehr,M. Weierstall,P. Weilhammer,A. M. Wetherell,D. Wicke,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. C. Zucchelli,G. Zumerle
European Physical Journal C(1995)
引用 29|浏览239
摘要
The forward-backward asymmetries for the processes
and
at theZ resonance are measured using identifiedD*± mesons. In 905,000 selected hadronic events, taken in 1991 and 1992 with the DEL-PHI detector at LEP, 4757D*+?D0p+ decays are reconstructed. Thec andb quark forward-backward asymmetries are determined to be:
$$\begin{gathered} A_{FB}^{c\bar c} = 0.077 \pm 0.029(stat) \pm 0.012(sys), \hfill \\ A_{FB}^{b\bar b} = 0.059 \pm 0.062(stat) \pm 0.024(sys). \hfill \\ \end{gathered} $$
Constraining theb asymmetry to the value measured by DELPHI using independent analyses, the charm asymmetry is determined to be:
$$A_{FB}^{c,const} = 0.068 \pm 0.027(stat) \pm 0.011(sys).$$
. This result corresponds to an effective electroweak mixing angle measured using charm quark events of:
$$\sin ^2 \theta _{eff}^{lept} = 0.2307 \pm 0.0062(stat) \pm 0.0026(sys).$$
更多![$$e^ + e^ - \to c\bar c$$](/fulltext-image.asp?format=htmlnonpaginated&src=P2165WN111783172_html\10052_2005_Article_BF01556359_TeX2GIFIE1.gif)
![$$e^ + e^ - \to b\bar b$$](/fulltext-image.asp?format=htmlnonpaginated&src=P2165WN111783172_html\10052_2005_Article_BF01556359_TeX2GIFIE2.gif)
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