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, Alessandro; De Boer, W; De Clercq, C; De Lotto, Barbara; 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.

doi:10.1016/j.physletb.2003.09.070

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:	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, Alessandro De Boer W De Clercq C DE LOTTO, Barbara 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. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2003
Rivista:	PHYSICS LETTERS. SECTION B
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
Appare nelle tipologie:	1.1 Articolo in rivista

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