A study of charm and anti-charm production in beauty decays with the OPAL detector at LEP. G Abbiendi , C Ainsely , P F Akesson , Gideon Alexander , J Allison , P Amaral , G Anagnostou , K J Anderson , S Arcelli , S Asai , D Axen , G Azuelos , I Bailey , E Barberio , R J Barlow , Richard Batley , P Bechtle , T Behnke , K W Bell , P J Bell , G Bella , A Bellerive , G Benelli , Siegfried Bethke , O Biebel , O Boeriu , P Bock , M Boutemeur , S Braibant , L Brigliadori , R M Brown , K Buesser , H Burchhart , S Campana , R K Carnegie , B Caron , A A Carter , J R Carter , C Y Chang , D G Charlton , A Csilling , M Cuffiani , S Dado , A De Roeck , E A De Wolf , K Desch , B Dienes , M Donkers , J Dubbert , E Duchovni , G Duckeck , I P Duerdoth , E Etzion , Fabrizio Fabbri , L Feld , P Ferrari , F Fiedler , I Fleck , M Ford , A Frey , A Furtjes , P Gagnon , J W Gary , G Gaycken , C Geichgimbel , G Giacomelli , P Giacomelli , M Giunta , J Goldberg , Eilam Gross , J Grunhaus , M Gruwe , P O Gunther , Atul Gupta , C Hajdu , M Hamann , G G Hanson , K Harder , A Harel , M Harindirac , M Hauschild , C M Hawkes , Richard John Hawkings , R J Hemingway , C Hensel , G Herten , R D Heuer , J C Hill , K D Hoffman , D Horvath , P Igokemenes , K Ishii , H Jeremie , P Jovanovic , T R Junk , Naoko Kanaya , J Kanzaki , G Karapetian , D Karlen , K Kawagoe , T Kawamoto , R Keeler , R G Kellogg , B W Kennedy , D H Kim , K K Klein , A Klier , S Kluth , Tetsuo Kobayashi , M Kobel , S Komamiya , L L Kormos , T Kramer , P Krieger , J Von Krogh , K Kruger , T Kuhl , M Kupper , G D Lafferty , H Landsman , D Lanske , J G Layter , A Leins , D Lellouch , J Letts , L Levinson , J Lillich , S L Lloyd , F K Loebinger , Jing Lu , J Ludwig , A Macpherson , W F Mader , S Marcellini , A Martin , G Masetti , T Mashimo , P Mattig , W J Mcdonald , J A Mckenna , T J Mcmahon , R A Mcpherson , F Meijers , W Menges , F S Merritt , H Mes , A Michelini , S Mihara , G Mikenberg , D J Miller , S Moed , W Mohr , T Mori , A Mutter , K Nagai , I Nakamura , H Nanjo , H A Neal , R Nisius , S W Oneale , Alexander Oh , A Okpara , M J Oreglia , S Orito , Christoph Pahl , Gabriella Pasztor , J R Pater , G N Patrick , J E Pilcher , J L Pinfold , D E Plane , B Poli , J Polok , O Pooth , M Pryzybycien , A Quadt , K Rabbertz , C Rembser , P Renkel , J M Roney , S Rosati , Y Rozen , K Runge , K Sachs , T Saeki , E K G Sarkisyan , A D Schaile , O Schaile , P Scharffhansen , J Schieck , T Schornersadenius , M Schroder , M Schumacher , C Schwick , W G Scott , R Seuster , T Shears , B C Shen , P Sherwood , G P Siroli , A Skuja , A M Smith , R Sobie , S Soldnerrembold , F Spano , Achim Stahl , K Stephens , D Strom , R Strohmer , S Tarem , M Tasevsky , R J Taylor , R J Teuscher , Mark Thomson , E Torrence , D Toya , P Tran , Isabel Marian Trigger , Zoltan Laszlo Trocsanyi , E Tsur , M F Turnerwatson , Ikuo Ueda , B Ujvari , C F Vollmer , P Vannerem , R Vertesi , M Verzocchi , H Voss , J H Vossebeld , D Waller , C P Ward , D R Ward , P M Watkins , A T Watson , N K Watson , P S Wells , T Wengler , N Wermes , D Wetterling , G W Wilson , J A Wilson , G Wolf , T R Wyatt , S Yamashita , D Zerzion , L Zivkovic European Physical Journal C（2004）
摘要
The branching ratio of beauty hadrons to final states containing two charm hadrons, Br(b-->D (D) over barX), has been measured using an inclusive method in hadronic Z(0) decays with the OPAL detector at LEP. The impact parameter significance of tracks opposite tagged b-jets is used to differentiate b-->D (D) over barX decays from other decays. The result isBr(b-->D (D) over barX) = (10.0 +/- 3.2 (stat.)(-2.9)(+2.4)(det.)(-9.0)(+10.4) (phys.))%,where det. is the systematic uncertainty due to the modelling of the detector, and phys. is the systematic uncertainty due to the modelling of the underlying physics. Using this result, the average number of charm plus anti-charm quarks produced in a beauty quark decay, n(c), is found to be 1.12(-0.10)(+0.11).
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关键词
beauty decays, opal detector, anti-charm
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