Determination of the average lifetime of b -baryons

P. Abreu et al.,Eduardo Cortina Gil,E Agasi,E Boudinov,W Hao,D J Holthuizen, P Kluit,B Koene,M Merk,M Nieuwenhuizen,W Ruckstuhl,I Siccama,J Timmermans,D Z Toet,Apeldoorn G W Van,Dam P H A Van,Eldik J E Van,D Bertrand,Charles Bricman,Futian F Cao, Max M Chen,A Deghorain,S De Brabandere,Catherine De Clercq,P Herquet,S Hoorelbeke,K Huet, V Lefebure,J Lemonne,A Tomaradze,Catherine Vander Velde,Walter Van Doninck,F Verbeure,J H Wickens,W Adam,T Adye,I Ajinenko, R Aleksan, G D Alekseev,R Alemany, P P Allport,S Almehed,U Amaldi,S Amato,A Andreazza,M L Andrieux,P Antilogus,W D Apel,Y Arnoud, B Asman,Je Augustin, A Augustinus, P Baillon, P Bambade, F Barao,R Barate,M Barbi,D Y Bardin, A Baroncelli,O Barring,J A Barrio,W Bartl,M J Bates,Marco Battaglia,M Baubillier,J Baudot, Kh Becks,M Begalli,P Beilliere,Yu Belokopytov,K Belous,A C Benvenuti,M Berggren,F Bianchi,M Bigi,M S Bilenky,P Billoir,D Bloch,M Blume,S Blyth,T Bolognese,M Bonesini,W Bonivento,P S L Booth,G Borisov,C Bosio,S Bosworth,O Botner,B Bouquet, C Bourdarios,T J V Bowcock,M Bozzo,P Branchini,K D Brand,T Brenke, R Brenner,L Brillault,R C A Brown,P Bruckman,Jm Brunet, L Bugge, T Buran,T Burgsmueller,P Buschmann,A Buys,S Cabrera,M Caccia, M Calvi,A J Camacho Rozas,T Camporesi, V Canale,M Canepa,K Cankocak, F Carena,L Carroll, C Caso,M V Castillo Gimenez, A Cattai, F R Cavallo, L Cerrito,V Chabaud,M Chapkin,Ph Charpentier,L Chaussard, J Chauveau, P Checchia,G A Chelkov, Meili Chen, R Chierici,P Chliapnikov, P Chochula,V Chorowicz,J Chudoba, V Cindro,P Collins,J L Contreras,R Contri,G Cosme, F Cossutti,H B Crawley,D Crennell, G Crosetti,J Cuevas Maestro, S Czellar,E Dahljensen,J Dahm,B Dalmagne,M Dam,G Damgaard, P D Dauncey,M Davenport,W Da Silva,C Defoix,G Della Ricca, P Delpierre, N Demaria,A De Angelis,W De Boer,C De La Vaissiere,B De Lotto,A De Min,L De Paula,C De Saintjean,H Dijkstra,L Di Ciaccio, F Djama,J Dolbeau,M Donszelmann, K Doroba,M Dracos, J Drees,K A Drees, M Dris,Y Dufour,D Edsall,R Ehret,G Eigen,Tord Ekelof,G Ekspong, M Elsing,Jp Engel,N Ershaidat,B Erzen,E Falk, D Fassouliotis, M Feindt,A Ferrer,T A Filippas,A Firestone,Peter Fischer,H Foeth,E Fokitis,F Fontanelli,F Formenti,Beverly S Franek,P Frenkiel,D C Fries,A G Frodesen, R Fruhwirth,F Fuldaquenzer,J Fuster,A Galloni,D Gamba,M Gandelman,C Garcia,Jesus Manuel Vizan Garcia,C Gaspar, U Gasparini,Ph Gavillet,E N Gazis, D Gele,Jp Gerber,L N Gerdyukov, M R J Gibbs, R Gokieli,B Golob,G P Gopal,L Gorn,Maciej Gorski,Yu Gouz,V Gracco,Enrico Graziani,G Grosdidier,K Grzelak,S Gumenyuk,P Gunnarsson,M Gunther,J Guy,F Hahn,S Hahn, Z Hajduk, A Hallgren,K Hamacher,F J Harris, V Hedberg,R Henriques,J J Hernandez,H Herr,T L Hessing,E Higon,H J Hilke,T S Hill,So Holmgren,P J Holt, M Houlden, J Hrubec, K Hultqvist, J N Jackson,R Jacobsson,P Jalocha,R Janik,Ch Jarlskog, G Jarlskog, P Jarry, B Jeanmarie,E K Johansson,Leif J Jonsson,P Jonsson, C Joram, P Juillot,Mary Elizabeth Kaiser,F Kapusta,K Karafasoulis,Magnus Karlsson,E Karvelas,S Katsanevas,E C Katsoufis,R Keranen,Yu A Khokhlov,B A Khomenko,N N Khovanski,Barry King,N J Kjaer, Hansjorg Klein,A Klovning,P Kokkinias,M Koratzinos, K Korcyl, C Kourkoumelis,O Kouznetsov,P H Kramer,M Krammer,C Kreuter,I Kronkvist,Z Krumstein,W Krupinski,P Kubinec,W Kucewicz,K Kurvinen, C Lacasta,I Laktineh,S Lamblot,J W Lamsa,L Lanceri,D W Lane,P Langefeld,Jp Laugier,R Lauhakangas,G Leder,F Ledroit,C K Legan, R Leitner,Y Lemoigne, G Lenzen,V Lepeltier,T Lesiak, D Liko,R Lindner, A Lipniacka,I Lippi,B Loerstad,J G Loken,J M Lopez,D Loukas,P Lutz, L Lyons,J Macnaughton,G Maehlum, A Maio,V Malychev,F Mandl,J Marco,Rafael Marco,B Marechal, M Margoni,Jc Marin, C Mariotti, A Markou,T Maron,C Martinezrivero,F Martinezvidal,S Marti I Garcia, J Masik, F Matorras, C Matteuzzi, Giorgio Matthiae, M Mazzucato,M Mc Cubbin,R Mc Kay,R Mc Nulty,J Medbo, C Meroni,S S Meyer, W T Meyer,M Michelotto, E Migliore, L Mirabito,W Mitaroff,U Mjoernmark, T Moa,R Moeller,K Moenig,M R Monge, P Morettini,H Mueller, L Mundim, W J Murray,B Muryn,G Myatt,F Naraghi, F L Navarria,S Navas, K Nawrocki,P Negri, S Nemecek,W Neumann,N Neumeister, R Nicolaidou,B S Nielsen, V Nikolaenko,P Niss,A Nomerotski,A Normand,W Oberschultebeckmann,V Obraztsov,A G Olshevski,A Onofre, R Orava,K Osterberg, A Ouraou, P Paganini, M Paganoni,P Pages,H Palka,Th D Papadopoulou,K Papageorgiou, L Pape,C Parkes,F Parodi,A Passeri, M Pegoraro,L Peralta, H Pernegger, A Perrotta, C Petridou, A Petrolini,M Petrovyck,H T Phillips,G Piana,F Pierre,M Pimenta,M Pindo,S Plaszczynski,O Podobrin, M E Pol,G Polok,P Poropat,V Pozdniakov,M Prest,P Privitera,N Pukhaeva, A Pullia, D Radojicic,Stefano Ragazzi,H Rahmani, P N Ratoff, A L Read,M Reale,P Rebecchi, N Redaelli,M Regler,D Reid,P Renton,L K Resvanis,F Richard, J A Richardson,J Ridky,G Rinaudo,I Ripp, A Romero,I Roncagliolo, P Ronchese, L Roos,E I Rosenberg,E Rosso,P Roudeau, T Rovelli,V Ruhlmannkleider,A Ruiz,K Rybicki,H Saarikko,Y Sacquin,A Sadovsky, G Sajot, J Salt,J Sanchez, M Sannino,M Schimmelpfennig,H Schneider,U Schwickerath,M A E Schyns, G Sciolla, F Scuri,P Seager,Y Sedykh,A M Segar,A Seitz,R Sekulin,R C Shellard, P Siegrist,S Simonetti, F Simonetto,A N Sisakian,B Sitar,T B Skaali,G Smadja, N Smirnov,O Smirnova,G R Smith,O Solovianov,R Sosnowski,D Souzasantos,T Spassov,E Spiriti,P Sponholz,S Squarcia,C Stanescu, S Stapnes,I Stavitski,F Stichelbaut, A Stocchi, Johann Strauss,R Strub, B Stugu,M Szczekowski,M Szeptycka,T Tabarelli,J P Tavernet,O G Tchikilev,A Tilquin,L G Tkatchev, T Todorov,B Tome,A Tonazzo,L Tortora,G Transtromer, D Treille, W Trischuk,G Tristram,A Trombini, C Troncon, A Tsirou,M L Turluer,I A Tyapkin, M Tyndel,S Tzamarias,B Ueberschaer,O Ullaland,V Uvarov, G Valenti,E Vallazza,N Vassilopoulos, G Vegni,L Ventura,W Venus,M Verlato,L S Vertogradov, D Vilanova, Pierre Vincent,L Vitale, E Vlasov,A S Vodopyanov, V Vrba, H Wahlen,C Walck,F Waldner,M Weierstall,P Weilhammer, C Weiser,A M Wetherell, D Wicke, M Wielers,G Wilkinson,W S C Williams,M Winter,M Witek,K Woschnagg,K Yip,O Yushchenko,F Zach,A M Zaitsev,A Zalewska, P Zalewski,D Zavrtanik,E Zevgolatakos,N I Zimin,M Zito,D Zontar,R Zuberi,G C Zucchelli, G Zumerle

Zeitschrift für Physik C Particles and Fields（1996）

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摘要

The average lifetime of b-baryons has been studied using 3 x 10(6) hadronic Z(0) decays collected by the DELPHI detector at LEP. Three methods have been used, based on the measurement of different observables: the proper decay time distribution of 206 vertices reconstructed with a Lambda, a lepton and an oppositely charged pion; the impact parameter distribution of 441 muons with high transverse momentum accompanied by a Lambda in the same jet; and the proper decay time distribution of 125 Lambda(c)-lepton decay vertices with the Lambda(c) exclusively reconstructed through its pK pi, pK(0) and Lambda 3 pi decay modes. The combined result is:[GRAPHICS]where the first systematic error is due to experimental uncertainties and the second to the uncertainties in the modelling of the b-baryon production and semi-leptonic decay, Including the measurement recently published by DELPHI based on a sample of proton-muon vertices, the average b-baryon lifetime is:[GRAPHICS][GRAPHICS]

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关键词

Invariant Mass, Time Projection Chamber, Primary Vertex, DELPHI Collaboration, Decay Vertex

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