The production fractions of charged and neutral b-hadrons in b-quark events from Z(0) decays have been measured with the DELPHI detector at LEP. An algorithm has been developed, based on a neural network, to estimate the charge of the weakly-decaying b-hadron by distinguishing its decay products from particles produced at the primary vertex. From the data taken in the years 1994 and 1995, the fraction of (b) over bar -quarks fragmenting into positively charged weakly-decaying b-hadrons has been measured to be: f(+) = (42.09+/-0.82(stat)+/-0.89(syst))%. Subtracting the rates for charged Xi(b)(+) and Omega(b)(+) baryons gives the production fraction of B+ mesons: f(Bu) = (40.99+/-0.82(stat)+/-1.11 (syst)) %. (C) 2003 Elsevier B.V. All rights reserved.



Titolo: A measurement of the branching fractions of the b-quark into charged and neutral b-hadrons
Autori: 
DE ANGELIS, Alessandro
DE LOTTO, Barbara
mostra contributor esterni 
Data di pubblicazione: 2003
Rivista: 
PHYSICS LETTERS. SECTION B  
Citazione: A measurement of the branching fractions of the b-quark into charged and neutral b-hadrons / Abdallah J; Abreu P; Adam W; Adzic P; Albrecht T; Alderweireld T; Alemany-Fernandez R; Allmendinger T; Allport PP; Amaldi U; Amapane N; Amato S; Anashkin E; Andreazza E; Andringa S; Anjos N; Antilogus P; Apel WD; Arnoud Y; Ask S; Asman B; Augustin JE; Augustinus A; Baillon P; Ballestrero A; Bambade P; Barbier R; Bardin D; Barker G; Baroncelli A; Battaglia M; Baubillier M; Becks KH; Begalli M; Behrmann A; Ben-Haim E; Benekos N; Benvenuti A; Berat C; Berggren M; Berntzon L; Bertrand D; Besancon M; Besson N; Bloch D; Blom M; Bluj M; Bonesini M; Boonekamp M; Booth PSL; Borisov G; Botner O; Bouquet B; Bowcock TJV; Boyko I; Bracko M; Brenner R; Brodet E; Bruckman P; Brunet JM; Bugge L; Buschmann P; Calvi M; Camporesi T; Canale V; Carena F; Castro N; Cavallo F; Chapkin M; Charpentier P; Checchia P; Chierici R; Chliapnikov P; Chudoba J; Chung SU; Cieslik K; Collins P; Contri R; Cosme G; Cossutti F; Costa MJ; Crawley B; Crennell D; Cuevas J; D'Hondt J; Dalmau J; Da Silva T; Da Silva W; Della Ricca G; De Angelis A; De Boer W; De Clercq C; De Lotto B; De Maria N; De Min A; De Paula L; Di Ciaccio L; Di Simone A; Doroba K; Drees J; Dris M; Eigen G; Ekelof T; Ellert M; Elsing M; Santo MCE; Fanourakis G; Fassouliotis D; Feindt M; Fernandez J; Ferrer A; Ferro F; Flagmeyer U; Foeth H; Fokitis E; Fulda-Quenzer F; Fuster J; Gandelman M; Garcia C; Gavillet P; Gazis E; Gokieli R; Golob B; Gomez-Ceballos G; Goncalves P; Graziani E; Grosdidier G; Grzelak K; Guy J; Haag C; Hallgren A; Hamacher K; Hamilton K; Haug S; Hauler F; Hedberg V; Hennecke M; Herr H; Hoffman J; Holmgren SO; Holt PJ; Houlden MA; Hultqvist K; Jackson JN; Jarlskog G; Jarry P; Jeans D; Johansson EK; Johansson PD; Jonsson P; Joram C; Jungermann L; Kapusta F; Katsanevas S; Katsoufis E; Kernel G; Kersevan BP; Kerzel U; Matteuzzi C; Mazzucato F; Mazzucato M; Mc Nulty R; Meroni C; Meyer WT; Migliore E; Mitaroff W; Mjoernmark U; Moa T; Moch M; Moenig K; Monge R; Montenegro J; Moraes D; Moreno S; Morettini P; Mueller U; Muenich K; Mulders M; Mundim L; Murray W; Muryn B; Myatt G; Myklebust T; Nassiakou M; Navarria F; Nawrocki K; Nicolaidou R; Nikolenko M; Oblakowska-Mucha A; Obraztsov V; Olshevski A; Onofre A; Orava R; Osterberg K; Ouraou A; Oyanguren A; Paganoni M; Paiano S; Palacios JP; Palka H; Papadopoulou TD; Pape L; Parkes C; Parodi F; Parzefall U; Passeri A; Passon O; Peralta L; Perepelitsa V; Perrotta A; Petrolini A; Piedra J; Pieri L; Pierre F; Pimenta M; Piotto E; Podobnik T; Poireau V; Pol ME; Polok G; Poropat P; Pozdniakov V; Pukhaeva N; Pullia A; Rames J; Ramler L; Read A; Rebecchi P; Rehn J; Reid D; Reinhardt R; Renton P; Richard F; Ridky J; Rivero M; Rodriguez D; Romero A; Ronchese P; Rosenberg E; Roudeau P; Rovelli T; Ruhlmann-Kleider V; Ryabtchikov D; Sadovsky A; Salmi L; Salt J; Savoy-Navarro A; Schwickerath U; Segar A; Sekulin R; Siebel M; Sisakian A; Smadja G; Smirnova O; Sokolov A; Sopczak A; Sosnowski R; Spassov T; Stanitzki M; Stocchi A; Strauss J; Stugu B; Szczekowski A; Szeptycka M; Szumlak T; Tabarelli T; Taffard AC; Tegenfeldt F; Timmermans J; Tkatchev L; Tobin M; Todorovova S; Tome B; Tonazzo A; Tortosa P; Travnicek P; Treille D; Tristram G; Trochimczuk M; Troncon C; Turluer ML; Tyapkin IA; Tyapkin P; Tzamarias S; Uvarov V; Valenti G; Van Dam P; Van Eldik J; Van Lysebetten A; van Remortel N; Van Vulpen I; Vegni G; Veloso F; Venus W; Verdier P; Verzi V; Vilanova D; Vitale L; Vrba V; Wahlen H; Washbrook AJ; Weiser C; Wicke D; Wickens J; Wilkinson G; Winter M; Witek M; Yushchenko O; Zalewska A; Zalewski P; Zavrtanik D; Zhuravlov V; Zimin NI; Zintchenko A; Zupan M. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 576:1-2(2003), pp. 29-42.
Abstract: The production fractions of charged and neutral b-hadrons in b-quark events from Z(0) decays have been measured with the DELPHI detector at LEP. An algorithm has been developed, based on a neural network, to estimate the charge of the weakly-decaying b-hadron by distinguishing its decay products from particles produced at the primary vertex. From the data taken in the years 1994 and 1995, the fraction of (b) over bar -quarks fragmenting into positively charged weakly-decaying b-hadrons has been measured to be: f(+) = (42.09+/-0.82(stat)+/-0.89(syst))%. Subtracting the rates for charged Xi(b)(+) and Omega(b)(+) baryons gives the production fraction of B+ mesons: f(Bu) = (40.99+/-0.82(stat)+/-1.11 (syst)) %. (C) 2003 Elsevier B.V. All rights reserved.
Handle: http://hdl.handle.net/11390/883340
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