Measurement Of The Lambda(0)(B) Decay Form Factor

J Abdallah,P Abreu,W Adam,P Adzic,T Albrecht,T Alderweireld,R Alemany-Fernandez,T Allmendinger,Pp Allport,U Amaldi,N Amapane,S Amato,E Anashkin,A Andreazza,S Andringa,N Anjos,P Antilogus,Wd Apel,Y Arnoud,S Ask,B Asman,Je Augustin, S Augustinus,P Baillon,A Ballestrero,P Bambade,R Barbier,D Bardin,G Barker,A Baroncelli,M Battaglia,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 Bowcock,I Boyko,M Bracko,R Brenner,E Brodet,P Bruckman,Jm Brunet,L Bugge,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,B Crawley,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,M Dris,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 Grosdidier, K Grzelek,J Guy,C Haag,A Hallgren,K Hamacher,K Hamilton,S Haug,F Hauler,V Hedberg,M Hennecke,H Herr,J Hoffman,So Holmgren,Pj Holt,Ma Houlden,K Hultqvist,Jn Jackson,G 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,A Kiiskinen,Bt King,Nj Kjaer,P Kluit,P Kokkinias,C Kourkoumelis,O Kouznetsov,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 Mariotti,A Markou,C Martinez-Rivero,J Masik,N Mastroyiannopoulos,F Matorras,C Matteuzzi,F Mazzucato,M Mazzucato,R Mcnulty,C Meroni,Wt Meyer,A Miagkov,E Migliore,W Mitaroff,U Mjoernmark,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 Passon,L Peralta,V Perepelitsa,A Perrotta,A Petrolini,J Piedra,L Pieri,F Pierre,M Pimenta,E Piotto,T Podobnik,V Poireau,Me Pol,G Polok,P Poropat,V Pozdniakov,N Pukhaeva,A Pullia,J Rames,L Ramler,A Read,P Rebecchi,J Rehn,D Reid,R Reinhardt,P Renton,F Richard,J Ridky,M Rivero,D Rodriguez,A Romero,P Ronchese,E Rosenberg,P Roudeau,T Rovelli,V Ruhlmann-Kleider,D Ryabtchikov,A Sadovsky,L Salmi,J Salt,A Savoy-Navarro,U Schwickerath,A Segar,R Sekulin,M Siebel,A Sisakian,G Smadja,O Smirnova,A Sokolov,A Sopczak,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,A Van Lysebetten,N Van Remortel,I Vanvulpen,G Vegni,F Veloso,W Venus,P Verdier,V Verzi,D Vilanova,L Vitale,V Vrba,H Wahlen,Aj Washbrook,C Weiser,D Wicke,J Wickens,G Wilkinson,M Winter,M Witek,O Yushchenko,A Zalewska,P Zalewski,D Zavrtanik,V Zhuravlov,Ni Zimin,A Zintchenko,M Zupan

Physics Letters B（2004）

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摘要

The form factor of A(o)(b) baryons is estimated using 3.46 x 10(6) hadronic Z decays collected by the DELPM experiment between 1992 and 1995. Charmed A(c)(+) baryons fully reconstructed in the pK(-)pi(+), pK(o)(s), and Api(+)pi(+)pi(-) modes, are associated to a c S lepton with opposite charge in order to select A(o)(b) --> A(c)(+)l(-)v(l) decays. From a combined likelihood and event rate fit to the b C distribution of the Isgur-Wise variable w, and using the Heavy Quark Effective Theory (HQET), the slope of the b-baryon form factor is measured to bep(2)=2.03+/-0.46(stat)(-1.00)(+0.72)(syst).The exclusive semileptonic branching fraction Br(A(b)(o) --> A(c)(+)l(-)v(l)) can be derived from p(2) and is found to be (5.0(-0.8)(+1.1)(stat)(-1.2)(+1.6) (syst))%. Limits on other branching fractions are also obtained. (C) 2004 Published by Elsevier B.V.

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