Observation of orbitally excited B mesons

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

doi:10.1016/0370-2693(94)01696-a

Abstract

Experimental evidence for the existence of orbitally excited B meson states is presented in an analysis of the Bπ and B ∗π distribution of Q = m(B ∗∗) − m(B (∗)) − m(π) using Z 0 decay data taken with the DELPHI detector at LEP. The mean Q-value of the decays B ∗∗ → B (∗)π is measured to be 284 ± 5 (stat.) ± 15 (syst.) MeV/c 2, and the Gaussian width of the signal is 79 ± 5 (stat.) ± 8 (syst.) MeV/c 2. This signal can be described as a single resonance of mass m = 5732 ± 5 (stat.) ± 20 (syst.) MeV/c 2 and full width Γ = 145 ± 28 MeV/c 2. The observed shape is also consistent with the production of several broad and narrow states as predicted by the quark model and partly observed in the D-meson sector. The production rate of B ∗∗ per b-jet is found to be 0.27 ± 0.02 (stat.) ± 0.06 (syst.).

Full Text