Search for exclusive decays of the Λb baryon and measurement of its mass

P Abreu ,M Chen,Cdf D.C Fries,W Da Silva,Nc V Cindro,W Mitaroff ,A M Zaitsev ,F Fontanelli ,A Galloni ,W D Apel ,F Verbeure ,F Carena ,S Katsanevas ,G Polok ,M Schimmelpfennig ,R Ehret ,B De Lotto ,S Czellár ,M Bigi ,S Hoorelbeke ,O Yushchenko ,R Sekulin ,D Fassouliotis ,I Siccama ,O Kouznetsov ,G R Smith ,A Romero ,V Chorowicz ,G Myatt ,C Garćıa ,C Weiser ,C Martínez-Rivero ,R Brenner ,G Vegni ,W Neumann ,M Nieuwenhuizen ,P Baillon ,M Gandelman ,R.c.a Brown ,S O Holmgren ,N Pukhaeva ,P Langefeld ,P Delpierre ,A Tilquin ,J Fuster ,N Redaelli ,R Aleksan ,T Rovelli ,N Ershaidat ,B Bouquet ,E Katsoufis ,G Mæhlum ,G Eigen ,K Karafasoulis ,O Solovianov ,M Koratzinos ,E Migliore ,I Ripp ,A M Segar ,H J Hilke ,E Zevgolatakos ,L Gorn ,L Jönsson ,V Chabaud ,C Jarlskog ,A Cattai ,D Wicke ,J Guy ,F Parodi ,A Firestone ,G Leder ,A Buys ,I Lippi ,A Stocchi ,F Djama ,T Adye ,J P Tavernet ,P Lutz ,M Berggren ,J E Augustin ,G Grosdidier ,M Szeptycka ,F Barão ,B Loerstad ,F Scuri ,H Wahlen ,U Amaldi ,F Stichelbaut ,S Meyer ,J Mašík ,Rui Henriques ,P Sponholz ,C Caso ,G Smadja ,S Gumenyuk ,C De Clercq ,P Niss ,B T King ,M Merk ,T Ekelöf ,K Grzelak ,P N Ratoff ,O Podobrin ,Yu.a Khokhlov ,B S Nielsen ,S Marti-Garcia ,B Sitár ,M Zito ,J Řídký ,M Tyndel ,H T Phillips ,A Ruiz ,A De Angelis ,K Korcyl ,S Plaszczynski ,P J Holt ,P Roudeau ,G Lenzen ,M R Monge ,K Österberg ,R Moeller ,V Ruhlmann-Kleider ,L Mundim ,T B Skaali ,M Battaglia ,P Jarry ,D Y Bardin ,E Graziani ,M Baubillier ,T Camporesi ,R Alemany ,R Keränen ,R Frühwirth ,W J Murray ,Kathy Huet ,E Fokitis ,B Maréchal ,M Gibbs ,P Gunnarsson ,M Witek ,T J V Bowcock ,A De Min ,A C Benvenuti ,E Spiriti ,V Lepeltier ,F Waldner ,W S C Williams ,P Jönsson ,M Mc Cubbin ,J M Brunet ,F Simonetto ,B Ueberschaer ,L Peralta ,Α Μάρκου ,A Tomaradze ,C Walck ,M Szczekowski ,R Barate ,P Negri ,M Karlsson ,Aurelio Juste Rozas ,F Matorras ,G Della Ricca ,P Zalewski ,Ch De La Vaissière ,R Contri ,M J Bates ,M Weierstall ,J Gerber ,L S Vertogradov ,P Herquet ,W Krupinski ,L Cerrito ,A Baroncelli ,B Jean‐Marie ,J Sánchez ,C Petridou ,M Dam ,Z Krumstein ,J M Vizan Garcia ,L Vitale ,F R Cavallo ,S Stapnes ,H Klein ,A Tonazzo ,B Franek ,B Dalmagne ,J Loken ,I Kronkvist ,C Matteuzzi ,I Ajinenko ,P Branchini ,D Crennell ,T Lesiak ,D Vilanova ,Y Sacquin ,Y Sedykh ,H Foeth ,F Formenti ,R Janik ,H Mueller ,J Salt ,K F Read ,M Canepa ,V Vrba ,P Weilhammer ,J Dolbeau ,T Buran ,T L Hessing ,G Tristram ,A Tsirou ,P Kubinec ,P Rebecchi ,G Cosme ,M V Castillo Gimenez ,M Mazzucato ,M Michelotto ,H Pernegger ,J Timmermans ,M Winter ,P Morettini ,E I Rosenberg ,Daniel Bertrand ,L Bugge ,O Bärring ,C Gaspar ,U Mjoernmark ,A Augustinus ,N I Zimin ,N Neumeister ,L Lanceri ,M Pernicka ,V Lefébure ,W Kucewicz ,M Sannino ,W Ruckstuhl ,K H Becks ,P Jałocha ,T A Filippas ,J Cuevas Maestro ,M L Andrieux ,T Todorov ,P Kramer ,P Checchia ,S Blyth ,A N Sisakian ,H Dijkstra ,Y Arnoud ,P Buschmann ,B A Khomenko ,C Kourkoumelis ,W Oberschulte-Beckmann ,J Drees ,D Loukas ,V Canale ,R Lauhakangas ,F Zach ,N Demaria ,F J Harris ,D Gelé ,W Bonivento ,H Herr ,T Bologneşe ,L G Tkatchev ,B Golob ,F Hahn ,R Orava ,T Maron ,M Bozzo ,P P Allport ,A Andreazza ,M Chapkin ,R Mc Kay ,H Rahmani ,M Reale ,J Dahm ,C Defoix ,G W Van Apeldoorn ,Miroslav Novák ,F Martínez-Vidal ,G Crosetti ,C Vander Velde ,E Dahl‐Jensen ,Y Dufour ,L Chaussard ,C Bourdarios ,C Stănescu ,I Stavitski ,P D Dauncey ,A Klovning ,S Bosworth ,K Rybicki ,G Sciolla ,C Kreuter ,G Sajot ,W K Van Doninck ,M Elsing ,L Mirabito ,N N Khovanski ,K Hultqvist ,M Górski ,R Gokieli ,J L Contreras ,J Strauss ,S Simonetti ,C Meroni ,D Gamba ,A Zalewska ,H Pałka ,E Rosso ,J Medbo ,D Žontar ,M Dönszelmann ,J Van Eldik ,L Carroll ,P Kluit ,A M Wetherell ,M A E Schyns ,B Koene ,P Bambade ,M Barbi ,I Last ,E Karvelas ,M S Bilenky ,P Siegrist ,K A Drees ,M Margoni ,F Ledroit ,A Vodopyanov ,F Mandl ,M Petrovyck ,C Troncon ,T Burgsmueller ,L Pape ,P Fischer ,J C Marin ,A G Olshevski ,G Tranströmer ,D Holthuizen ,J M Lopez ,A Ouraou ,I A Tyapkin ,A Seitz ,P Frenkiel ,O Botner ,R Chierici ,J Baudot ,J A Barrio ,A Perrotta ,P Chliapnikov ,J J Hernández ,S Ragazzi ,M Calvi ,R Lindner ,R Strub ,S R Hahn ,H B Crawley ,M Pegoraro ,P Billoir ,S Almehed ,O Tchikilev ,L Tortora ,G D Alekseev ,Y Lemoigne ,M Wielers ,H Schneider ,A Ferrer ,O Smirnova ,R Nicolaidou ,P Paganini ,V Hedberg ,I Roncagliolo ,W De Boer ,G Chelkov ,L Ventura ,M Paganoni ,A B Fenyuk ,F L Navarria ,F Kapusta ,M Günther ,C K Legan ,N Smirnov ,D Radojičić ,G Ekspong ,Erik Johansson ,M Pindo ,A Pullia ,S Sánchez Navas ,P Van Dam ,O Ullaland ,J Hrubec ,K Doroba ,A Nomerotski ,F Naraghi ,G Damgaard ,P Pagès ,P Ronchese ,C Bosio ,D Souza-Santos ,R Jacobsson ,W Adam ,D Z Toet ,W Trischuk ,E Falk ,A G Frodesen ,T Tabarelli ,L Lyons ,B Åsman ,C Lacasta ,M Caccia ,M Regler ,D Blöch ,M Pimenta ,D Zavrtanik ,M Bonesini ,G Valenti ,T Moa ,Z Hajduk ,S Lamblot ,Yu Belokopytov ,M L Turluer ,K Papageorgiou ,C Parkes ,K Moenig ,J P Laugier ,Yu Gouz ,P.s.l Booth ,P Collins ,V Gracco ,R Zuberi ,W Vénus ,S Cabrera ,L Roos ,J Lämsä ,F Cossutti ,R Mc Nulty ,E Agasi ,F Fulda-Quenzer ,L Di Ciaccio ,A Sadovsky ,L Brillault ,K Cankoçak ,A Hallgren ,G Piana ,T Spassov ,E N Gazis ,P Vincent ,P Seager ,C Bricman ,G C Zucchelli ,C Mariotti ,W T Meyer ,G Jarlskog ,T S Hill ,S De Brabandere ,U Schwickerath ,M Feindt ,J Marco ,D Reid ,P Renton ,N J Kjaer ,E Vallazza ,N Vassilopoulos ,P Beillière ,V Malychev ,E Higón ,M Verlato ,U Gasparini ,K Nawrocki ,J Chauveau ,G Wilkinson ,A Trombini ,M Houlden ,P Chochula ,M Esṕırito Santo ,M Prest ,M Blume ,V Nikolaenko ,B Muryn ,L K Resvanis ,R C Shellard ,A Petrolini ,V Uvarov ,B Stugu ,Ph Charpentier ,V Obraztsov ,D Liko ,G P Gopal ,J Chudoba ,D W Lane ,L De Paula ,J Wickens ,R Leitner ,W Hao ,P Poropat ,S Amato ,M Dris ,Ph Gavillet ,A Normand ,R Sosnowski ,M Begalli ,E Vlasov ,F Richard ,Th D Papadopoulou ,V Pozdniakov ,P Brückman ,C Joram ,W Bartl ,C De Saint-Jean ,K D Brand ,G Matthiae ,G Borisov ,M E Pol ,J Richardson ,K Kurvinen ,J Macnaughton ,J N Jackson ,A Lipniacka ,R Marco ,A Deghorain ,K Hamacher ,P Juillot ,B Tomé ,D Edsall ,S Tzamarias ,M Dracos ,E Boudinov ,F Cao ,P Antilogus ,I B Laktineh ,M Kaiser ,J P Engel ,A Passeri ,E Cortina ,F Bianchi ,K Yip ,J Lemonne ,P Privitera ,M Davenport ,G Rinaudo ,K Woschnagg ,B Erzen ,F Pierre ,S Squarcia ,D Treille ,P Kokkinias ,T Brenke ,H Saarikko ,G Zumerle

doi:10.1016/0370-2693(96)00306-1

Search for exclusive decays of the Λb baryon and measurement of its mass

P Abreu , M Chen + Show 547 more

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https://doi.org/10.1016/0370-2693(96)00306-1

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#Beauty Baryon #DELPHI Detector + Show 8 more

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Abstract

A search for fully reconstructed Λ b 0 beauty baryons is performed using about 3 million Z decays collected with the DELPHI detector at LEP. The analysis relies on the combined use of the accurate tracking and of the hadron identification capabilities of DELPHI. A total of four events has been found, three in the Λ c + π − channel and one in the Λ c + a 1 − channel over a small background. The Λ b 0 beauty baryon mass is measured to be (5668 ± 16 (stat.) ± 8 (syst.)) MeV/c 2.

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