Evidence for B S0 meson production in Z 0 decays

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Bjarne,J Timmermans,V Perevozchikov,M.D.M De Fez Laso,I Lippi,G Borisov,M Szczekowski,C Caso,D Crennell,E Daubie,F Cao,G Polok,K Kurvinen,R Lindner,P Vaz,P Lutz,C Bosio,E Vallazza,M Davenport,F Pierre,B De Lotto,H Foeth,I Roncagliolo,B Golob,G Smadja,H Mueller,G Voulgaris,M Chapkin,P Negri,G Leder,S Francon,A Daum,M Feindt,V Chorowicz,F Bianchi,M Battaglia,R Orava,R Holmes,R Contri,M Weierstall,H Schneider,R Strub,G Lenzen,M De Beer,B Loerstad,S Tzamarias,F Fulda-Quenzer,G Matthiae,C Walck,P Weilhammer,H Wahlen,A Stocchi,R Sosnowski,Yu Belokopytov,I Hietanen,T Henkes,U Kruener-Marquis,M Tyndel,A Zalewska,G Ekspong,G Hamel De Mochenault,R Zukanovich Funchal,M Pimenta,G Vegni,B Nijjhar,G Meola,R Sekulin,S Braibant,S Almehed,V Kostioukhine,P Collins,P Delpierre,M Crozon,F Fontanelli,P Branchini,A Katargin,M Pernicka,O Ullaland,G Cosme,R Barate,W Klempt,A Algeri,K Belous,D Fassouliotis,M Mc Cubbin,F Ledroit,E Zevgolatakos,G Sajot,P Roudeau,B Franek,H Saarikko,P.S.L Booth,F Naraghi,F 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Fernández Alonso ,W Trischuk ,F R Cavallo ,M Caccia ,T L Hessing ,P Jałocha ,M Calvi ,A G Frodesen ,B Grossetête ,A Goobar ,R Brenner ,P O Hulth ,J E Hooper ,F Matorras ,A Chan ,M Lokajı́ček ,P Ioannou ,G Jarlskog ,D Z Toet ,A Hallgren ,M Sannino ,S J Alvsvaag ,Ch De La Vaissière ,V M Ronjin ,Stefan Delorme ,B Boštjančič ,C Kourkoumelis ,L K Resvanis ,E N Tsyganov ,C Meroni ,A Romero ,A Augustinus ,G Zumerle ,J Wickens ,N Demaria ,M Wayne ,B Jean‐Marie ,T Rovelli ,M J Bates ,J M Brunet ,J Maillard ,J M Lévy ,G Darbo ,D Radojičić ,V Uvarov ,J Loken ,J L Fousset ,P N Ratoff ,S Rossi ,G Sciolla ,R Cirio ,E Vlasov ,J J Gomez Y Cadenas ,J E Augustin ,S Martí ,W Mitaroff ,P Chliapnikov ,G D Alekseev ,A M Wetherell ,E Anassontzis ,J Salt ,V G Timofeev ,K Mönig ,W D Apel ,N Brümmer ,V Nikolaenko ,C Lacasta ,B S Nielsen ,N N Khovanski ,A Korytov ,L G Tkatchev ,P Baillon ,P Juillot ,M Begalli ,P Allen ,A Ostankov ,O Bärring ,M T Trainor ,M Winter ,H Borner ,H B Crawley ,S Stapnes ,M Houlden ,S Ragazzi ,C Rönnqvist ,C Troncon ,L Cerrito ,A Cattai ,A Tsirou ,P Dauncey ,P Checchia ,T A Filippas ,E Torassa ,O Kouznetsov ,L Mirabito ,M.p Clara ,J Fuster ,S Tavernier ,H Pałka ,R C Shellard ,M Hahn ,G R Smith ,Erik Johansson ,D Y Bardin ,M L Turluer ,T Ekelöf ,H Fürstenau ,K Woschnagg ,V Lapin ,M E Pol ,K.a.j Forbes ,T Adye ,J Hrubec ,P.e.s Nilsen ,M Dam ,M Dracos ,G Kalkanis ,J A Valls Ferrer ,J M Vizan Garcia ,S D Hodgson ,A Perrotta ,C Bricman ,H J Hilke ,J Řídký ,R Leitner ,P Szymański ,K Korcyl ,P Jarry ,F Grard ,E Higón ,C O Higgins ,P F Honoré ,A M Segar ,J P Laugier ,M A E Schyns ,J Buytaert ,G Mæhlum ,W S C Williams ,J Lozano ,C Beeston ,A Tilquin ,B T King ,K F Read ,P Beillière ,J L Contreras ,T B Skaali ,C Petridou ,D Loukas ,F Scuri ,M Dris ,J Cuevas ,J Marco ,E N Gazis ,F Djama ,M Turała ,J Lämsä ,E Gross ,J Królikowski ,G Stavropoulos ,L Pape ,M V Castillo Gimenez ,R.c.a Brown ,F J Harris ,J Lemonne ,A Baroncelli ,J Sánchez ,J Gerber ,P Billoir ,K Doroba ,R Frühwirth ,M Paganoni ,P David ,T.e Pettersen ,P Privitera ,K H Becks ,N Redaelli ,A Vodopyanov ,M Pegoraro ,K Hamacher ,C Garćıa ,A M Zaitsev ,A N Sisakian ,S Czellár ,L Chevalier ,J J Hernández ,M Karlsson ,J A Barrio ,K Österberg ,J Zúñiga

doi:10.1016/0370-2693(92)91385-m

Abstract

Seven unambiguous events out of a sample of 270 000 Z0 decays, contain in the same jet a Ds meson and a muon at large transverse momentum relative to the jet axis. These events are direct evidence for Bs 0 meson production in hadronic Z0 decays. The production rate of these events, relative to all hadronic Z0 decays is (18 ± 8) × 10-5, this number including the relevant branching fractions of the Bs 0 and Ds. The value of the Bs 0 meson lifetime relative to the average B meson lifetime is measured to be 0.8 ± 0.4.

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