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Measurement of the forward-backward asymmetries of $e^+e^- \rightarrow Z \rightarrow b\overline{b}$ and $e^+e^- \rightarrow Z \rightarrow c\overline{c}$ using prompt leptons

J. Abdallah 1 P. Abreu W. Adam P. Adzic T. Albrecht T. Alderweireld R. Alemany-Fernandez T. Allmendinger P. Allport U. Amaldi N. Amapane S. Amato E. Anashkin A. Andreazza S. Andringa N. Anjos P. Antilogus 1 W-D. Apel Y. Arnoud 2 S. Ask B. Asman J.-E. Augustin 1 A. Augustinus P. Baillon A. Ballestrero P. Bambade 3 R. Barbier 4 D. Bardin G. Barker A. Baroncelli M. Battaglia M. Baubillier 1 K.-H. Becks M. Begalli A. Behrmann E. Ben-Haim 3 N. Benekos A. Benvenuti C. Berat 2 M. Berggren 1 L. Berntzon D. Bertrand M. Besancon N. Besson D. Bloch 5 M. Blom M. Bluj M. Bonesini M. Boonekamp L. Booth G. Borisov O. Botner B. Bouquet 3 V. Bowcock I. Boyko M. Bracko R. Brenner E. Brodet P. Bruckman J.-M. Brunet 6 L. Bugge P. Buschmann M. Calvi T. Camporesi V. Canale F. Carena N. Castro F. Cavallo M. Chapkin Ph. Charpentier P. Checchia R. Chierici P. Chliapnikov J. Chudoba U. Chung K. Cieslik P. Collins R. Contri G. Cosme 3 F. Cossutti J. Costa D. Crennell J. Cuevas J. d'Hondt J. Dalmau T. da Silva W. da Silva 1 G. Della Ricca A. de Angelis W. de Boer C. de Clercq B. de Lotto N. de Maria A. de Min L. de Paula L. Di Ciaccio A. Di Simone K. Doroba J. Drees M. Dris G. Eigen T. Ekelof M. Ellert M. Elsing C. Espirito Santo G. Fanourakis D. Fassouliotis M. Feindt J. Fernandez A. Ferrer F. Ferro U. Flagmeyer H. Foeth E. Fokitis F. Fulda-Quenzer 3 J. Fuster M. Gandelman C. Garcia Ph. Gavillet E. Gazis R. Gokieli B. Golob G. Gomez-Ceballos P. Goncalves E. Graziani G. Grosdidier 3 K. Grzelak J. Guy C. Haag A. Hallgren K. Hamacher K. Hamilton S. Haug F. Hauler V. Hedberg M. Hennecke H. Herr Jakobus Hoffman S-O. Holmgren J. Holt A. Houlden K. Hultqvist N. Jackson G. Jarlskog P. Jarry D. Jeans K. Johansson D. Johansson P. Jonsson 4 C. Joram L. Jungermann F. Kapusta 1 S. Katsanevas 4 E. Katsoufis G. Kernel P. Kersevan U. Kerzel A. Kiiskinen T. King J. Kjaer P. Kluit P. Kokkinias C. Kourkoumelis O. Kouznetsov Z. Krumstein M. Kucharczyk J. Lamsa G. Leder F. Ledroit 2 L. Leinonen R. Leitner J. Lemonne V. Lepeltier 3 T. Lesiak W. Liebig D. Liko A. Lipniacka H. Lopes Morgan Lopez D. Loukas P. Lutz L. Lyons J. Macnaughton A. Malek S. Maltezos F. Mandl J. Marco R. Marco B. Marechal M. Margoni J-C. Marin C. Mariotti A. Markou C. Martinez-Rivero J. Maik N. Mastroyiannopoulos F. Matorras C. Matteuzzi F. Mazzucato M. Mazzucato R. Mc Nulty C. Meroni E. Migliore W. Mitaroff U. Mjoernmark T. Moa M. Moch K. Moenig R. Monge J. Montenegro D. Moraes S. Moreno P. Morettini U. Mueller K. Muenich M. Mulders L. Mundim W. Murray B. Muryn G. Myatt T. Myklebust M. Nassiakou F. Navarria K. Nawrocki R. Nicolaidou M. Nikolenko 5 A. Ob Lakowska-Mucha V. Obraztsov A. Olshevski A. Onofre R. Orava K. Osterberg A. Ouraou A. Oyanguren M. Paganoni S. Paiano P. Palacios H. Palka D. Papadopoulou L. Pape C. Parkes F. Parodi U. Parzefall A. Passeri O. Passon L. Peralta V. Perepelitsa A. Perrotta A. Petrolini J. Piedra L. Pieri F. Pierre M. Pimenta E. Piotto T. Podobnik V. Poireau E. Pol G. Polok P. Poropat V. Pozdniakov N. Pukhaeva A. Pullia J. Rames L. Ramler A. Read P. Rebecchi J. Rehn D. Reid R. Reinhardt P. Renton F. Richard 3 J. Ridky M. Rivero D. Rodriguez A. Romero P. Ronchese P. Roudeau 3 T. Rovelli V. Ruhlmann-Kleider D. Ryabtchikov A. Sadovsky L. Salmi J. Salt A. Savoy-Navarro 1 U. Schwickerath A. Segar R. Sekulin M. Siebel A. Sisakian G. Smadja 4 O. Smirnova A. Sokolov A. Sopczak R. Sosnowski T. Spassov M. Stanitzki A. Stocchi 3 J. Strauss B. Stugu M. Szczekowski M. Szeptycka T. Szumlak T. Tabarelli C. Taffard F. Tegenfeldt J. Timmermans L. Tkatchev M. Tobin S. Todorovova B. Tome A. Tonazzo Pablo Tortosa P. Travnicek D. Treille G. Tristram 6 M. Trochimczuk C. Troncon M-L. Turluer A. Tyapkin P. Tyapkin S. Tzamarias V. Uvarov G. Valenti P. van Dam J. van Eldik A. van Lysebetten N. van Remortel I. van Vulpen G. Vegni F. Veloso W. Venus P. Verdier 4 V. Verzi D. Vilanova L. Vitale V. Vrba H. Wahlen J. Washbrook C. Weiser D. Wicke J. Wickens G. Wilkinson M. Winter 5 M. Witek O. Yushchenko A. Zalewska D. Zavrtanik V. Zhuravlov I. Zimin A. Zintchenko M. Zupan
Abstract : The forward-backward asymmetries of the processes $e^+e^- \rightarrow Z \rightarrow b \overline{b}$ and $e^+e^- \rightarrow Z \rightarrow c \overline{c}$ were measured from a sample of hadronic Zdecays collected by the DELPHI experiment between 1993 and 1995. Enriched samples of $b\bar{b}$ and $c\bar{c}$ events were obtained using lifetime information. The tagging of b and c quarks in these samples was based on the semileptonic decay channels $b/c \rightarrow X + \mu $ and $ b/c \rightarrow X + e $ combined with charge flow information from the hemisphere opposite to the lepton. Combining the $A_{\mathrm{FB}}^{\mathrm{b\overline{\mathrm{b}}}}$ and $A_{\mathrm{FB}}^{\mathrm{c\overline{\mathrm{c}}}}$ measurements presented in this paper with published results based on 1991 and 1992 DELPHI data samples, the following pole asymmetries were obtained: \begin{displaymath}\mbox{$A_{\mathrm{FB}}^{\mathrm{0, b}}$}= 0.1021 \pm 0.0052 \mathrm{~(stat)} \pm 0.0024 \mathrm{~(syst)} \end{displaymath} \begin{displaymath}\mbox{$A_{\mathrm{FB}}^{\mathrm{0, c}}$}= 0.0728 \pm 0.0086 \mathrm{~(stat)} \pm 0.0063 \mathrm{~(syst)}\end{displaymath} The effective value of the weak mixing angle derived from these measurements is \begin{displaymath}\mbox{$\sin ^2 \theta_{\mathrm{W,eff}}^{\mathrm{lept}}$}= 0.23170 \pm 0.00097 .\end{displaymath}
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J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, et al.. Measurement of the forward-backward asymmetries of $e^+e^- \rightarrow Z \rightarrow b\overline{b}$ and $e^+e^- \rightarrow Z \rightarrow c\overline{c}$ using prompt leptons. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2004, 34, pp.109-125. ⟨10.1140/epjc/s2004-01708-6⟩. ⟨in2p3-00021837⟩

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