Production of Xi(0)(c) and Xi(b) in Z decays and lifetime measurement of Xi(b)

Summary, in English

The charmed strange baryon Xi(c)(0) was searched for in the decay channel Xi(c)(0) -> Xi(-)pi(+), and the beauty strange baryon Xi(b) in the inclusive channel Xi(b) -> Xi(-)l(-)(nu) over barX, using the 3.5 million hadronic Z events collected by the DELPHI experiment in the years 1992-1995. The Xi(-) was reconstructed through the decay AT, using a constrained fit method for cascade decays. An iterative discriminant analysis was used for the Xi(c)(0) and Xi(b) selection. The production rates were measured to be f(Xi c)(0) x BR(Xi(c)(0) -> Xi(-)pi(+) = (4.7 +/- 1.4(stat.) +/- 1.1(syst.)) x 10(-4) per hadronic Z decay, and BR(b -> Xi(b))xBR(Xi(b) -> Xi(-)l(-)X) = (3.0 +/- 1.0(stat.) +/- 0.3(syst.)) x 10(-4) for each lepton species (electron or muon). The lifetime of the Xi(b) baryon was measured to be tau(Xi b) = 1.45(-0.43)(+0.55)(stat.)+/- 0.13(syst.) ps. A combination with the previous DELPHI lifetime measurement gives tau(Xi b) = 1.48(-0.31)(+0.40)(stat.)+/- 0.12(syst.) ps.

• Author: J Abdallah; P Abreu; W Adam; P Adzic; T Albrecht; T Alderweireld; R Alemany-Fernandez; T Allmendinger; PP Allport; U Amaldi; N Amapanel; S Amato; E Anashkin; A Andreazza; S Andringa; N Anjos; P Antilogus; WD Apel; Y Arnoud; S Ask; B Asman; JE Augustin; A Augustinus; P Baillon; A Ballestrero; P Bambade; R Barbier; D Bardin; GJ Barker; A Baroncelli; M Battaglias; M Baubillier; KH Becks; M Begalli; A Behrmann; E Ben-Haim; N Benekos; A Benvenuti; C Berat; M Berggren; L Berntzon; D Bertrand; M Besancon; N Besson; D Bloch; M Blom; M Bluj; M Bonesini; M Boonekamp; PSL Booth; G Borisov; O Botner; B Bouquet; TJV Bowcoek; I Boyko; M Bracko; R Brenner; E Brodet; P Bruckman; JM Brunet; P Buschmann; M Calvi; T Camporesi; V Canale; F Carena; N Castro; F Cavallo; M Chapkin; P Charpentier; P Checchia; R Chierici; P Chliapnikov; J Chudoba; SU Chung; K Cieslik; P Collins; R Contri; G Cosme; F Cossutti; MJ Costa; D Crennell; J Cuevas; J D'Hondt; J Dalmau; T da Silva; W Da Silva; 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; G Eigen; T Ekelof; M Ellert; M Elsing; MCE Santo; G Fanourakis; D Fassouliotis; M Feindt; J Fernandez; A Ferrer; F Ferro; U Flagmeyer; H Foeth; E Fokitis; F Fulda-Quenzer; J Fuster; M Gandelman; C Garcia; P Gavillet; E Gazis; R Gokieli; B Golob; G Gomez-Ceballos; P Goncalves; E Graziani; G Crosdidier; K Grzelak; J Guy; C Haag; A Hallgren; K Hamacher; K Hamilton; S Haug; F Hauler; Vincent Hedberg; M Hennecke; H Herr; J Hoffman; SO Holmgren; PJ Holt; MA Houlden; K Hultqvist; JN Jackson; Göran Jarlskog; P Jarry; D Jeans; EK Johansson; PD Johansson; P Jonsson; C Joram; L Jungermann; F Kapusta; S Katsanevas; E Katsoufis; G Kernel; BP Kersevan; U Kerzel; BT King; NJ Kjaer; P Kluit; P Kokkinias; C Kourkoumelis; O Kouznetson; Z Krumstein; M Kucharczyk; J Lamsa; G Leder; F Ledroit; L Leinonen; R Leitner; J Lemonne; V Lepeltier; T Lesiak; W Liebig; D Liko; A Lipniacka; JH Lopes; JM Lopez; D Loukas; P Lutz; L Lyons; J MacNaughton; A Malek; S Maltezos; F Mandl; J Marco; R Marco; B Marechal; M Margoni; JC Marin; C Mariottis; A Markou; C Martinez-Rivero; J Masik; N Mastroyiannopoulos; F Matorras; C Matteuzzi; F Mazzucato; M Mazzucato; R Mc Nulty; C Meroni; E Mighore; W Mitaroff; Ulf Mjörnmark; 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; A Oblakowska-Mucha; V Obraztsov; A Olshevski; A Onofre; R Orava; K Osterberg; A Ouraou; A Oyanguren; M Paganoni; S Paiano; JP Palacios; H Palka; TD Papadopoulou; L Pape; C Parkes; F Parodi; U Parzefall; A Passeri; O Passo; L Peralta; V Perepelitsa; A Perrotta; A Petrolini; J Piedra; L Pieri; F Pierre; M Pimenta; E Piotto; T Podobnik; V Poireau; AE Pol; G Polok; V Pozdniakov; N Pukhaeva; A Pullia; J Rames; A Read; P Rebecchi; J Rehn; D Reid; R Reinhardt; P Renton; F Richard; J Ridky; M Rivero; D Rodriguez; A Romero; P Ronchese; P Roudea; T Rovelli; V Ruhlmann-Kleider; D Ryabtchikov; A Sadovsky; L Salmi; J Salt; C Sander; A Savoy-Navarro; U Schwickerath; A Segar; R Sekulin; M Siebel; A Sisakian; G Smadja; Oxana Smirnova; A Sokolov; A Sopezak; R Sosnowski; T Spassov; M Stanitzki; A Stocchi; J Strauss; B Stugu; M Szczekowski; M Szeptycka; T Szumlak; T Tabarelli; AC Taffard; F Tegenfeldt; J Timmermans; L Tkatchev; M Tobin; S Todorovova; B Tome; A Tonazzo; P Tortosa; P Travnicek; D Treille; G Tristram; M Trochimczuk; C Troncon; ML Turluer; IA Tyapkin; P Tyapkin; S Tzamarias; V Uvarov; G Valenti; P Van Dam; J Van Eldik; N van Remortel; I Van Vulpen; G Vegni; F Veloso; W Venus; P Verdier; V Verzi; D Vilanona; L Vitale; V Vrba; H Wahlen; AJ Washbrook; C Weiser; D Wicke; J Wickens; G Wilkinson; A Winter; M Witek; O Yushchenko; A Zalewska; P Zalewski; D Zavrtanik; V Zhuravlov; NI Zimin; A Zintchenko; M Zupan
• Department/s: Particle and nuclear physics
• Publishing year: 2005
• Language: English
• Pages: 299-309
• Publication/Series: European Physical Journal C. Particles and Fields
• Volume: 44
• Issue: 3
• Links: http://dx.doi.org/10.1140/epjc/s2005-02388-4
• Document type: Journal article
• Publisher: Springer
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1434-6044