Measurement Of The (B)Over-Bar -> D-(*)Pi L(Nu)Over-Bar(L) Branching Fraction P Abreu , W Adam , T Adye , P Adzic , I Ajinenko , Z Albrecht , T Alderweireld , Gd Alekseev , R Alemany , T Allmendinger , Pp Allport , S Almehed , U Amaldi , N Amapane , S Amato , Eg Anassontzis , P Andersson , A Andreazza , S Andringa , P Antilogus , Wd Apel , Y Arnoud , B Asman , Je Augustin , A Augustinus , P Baillon , P Bambade , F Barao , G Barbiellini , R Barbier , Dy Bardin , G Barker , A Baroncelli , M Battaglia , M Baubillier , Kh Becks , M Begalli , A Behrmann , P Beilliere , Y Belokopytov , Nc Benekos , Ac Benvenuti , C Berat , M Berggren , D Bertini , D Bertrand , M Besancon , M Bigi , Ms Bilenky , Ma Bizouard , D Bloch , Hm Blom , M Bonesini , W Bonivento , M Boonekamp , Psl Booth , Aw Borgland , G Borisov , C Bosio , O Botner , E Boudinov , B Bouquet , C Bourdarios , Tjv Bowcock , I Boyko , I Bozovic , M Bozzo , M Bracko , P Branchini , Ra Brenner , P Bruckman , Jm Brunet , L Bugge , T Buran , B Buschbeck , P Buschmann , S Cabrera , M Caccia , M Calvi , T Camporesi , V Canale , F Carena , L Carroll , C Caso , Mvc Gimenez , A Cattai , Fr Cavallo , V Chabaud , P Charpentier , L Chaussard , P Checchia , Ga Chelkov , R Chierici , P Chliapnikov , P Chochula , V Chorowicz , J Chudoba , K Cieslik , P Collins , R Contri , E Cortina , G Cosme , F Cossutti , Hb Crawley , D Crennell , S Crepe , G Crosetti , Jc Maestro , S Czellar , M Davenport , W Da Silva , G Della Ricca , P Delpierre , N Demaria , A De Angelis , W De Boer , C De Clercq , B De Lotto , A De Min , L De Paula , H Dijkstra , L Di Ciaccio , J Dolbeau , K Doroba , M Dracos , J Drees , M Dris , A Duperrin , Jd Durand , G Eigen , T Ekelof , G Ekspong , M Ellert , M Elsing , Jp Engel , Me Santo , G Fanourakis , D Fassouliotis , J Fayot , M Feindt , P Ferrari , A Ferrer , E Ferrer-Ribas , F Ferro , S Fichet , A Firestone , U Flagmeyer , H Foeth , E Fokitis , F Fontanelli , B Franek , Ag Frodesen , R Fruhwirth , F Fulda-Quenzer , J Fuster , A Galloni , D Gamba , S Gamblin , M Gandelman , C Garcia , C Gaspar , M Gaspar , U Gasparini , P Gavillet , En Gazis , D Gele , L Gerdyukov , N Ghodbane , I Gil , F Glege , R Gokieli , B Golob , G Gomez-Ceballos , P Goncalves , Ig Caballero , G Gopal , L Gorn , V Gracco , J Grahl , E Graziani , P Gris , G Grosdidier , K Grzelak , J Guy , F Hahn , S Hanh , S Haider , A Hallgren , K Hamacher , J Hansen , Fj Harris , V Hedberg , S Heising , Jj Hernandez , P Herquet , H Herr , Tl Hessing , Jm Heuser , E Higon , So Holmgren , Pj Holt , S Hoorelbeke , M Houlden , J Hrubec , M Huber , K Huet , Gj Hughes , K Hultqvist , Jn Jackson , R Jacobsson , P Jalocha , R Janik , C Jarlskog , G Jarlskog , P Jarry , B Jean-Marie , D Jeans , Ek Johansson , P Jonsson , C Joram , P Juillot , L Jungermann , F Kapusta , K Karafasoulis , S Katsanevas , Ec Katsoufis , R Keranen , G Kernel , Bp Kersevan , Y Khokhlov , Ba Khomenko , Nn Khovanski , A Kiiskinen , B King , A Kinvig , Nj Kjaer , O Klapp , H Klein , P Kluit , P Kokkinias , V Kostioukhine , C Kourkoumelis , O Kouznetsov , M Krammer , E Kriznic , Z Krumstein , P Kubinec , J Kurowska , K Kurvinen , Jw Lamsa , Dw Lane , V Lapin , Jp Laugier , R Lauhakangas , G Leder , F Ledroit , V Lefebure , L Leinonen , A Leisos , R Leitner , J Lemonne , G Lenzen , V Lepeltier , T Lesiak , M Lethuillier , J Libby , W Liebig , D Liko , A Lipniacka , I Lippi , B Loerstad , Jg Loken , Jh Lopes , Jm Lopez , R Lopez-Fernandez , D Loukas , P Lutz , L Lyons , J Macnaughton , Jr Mahon , A Maio , A Malek , Tgm Malmgren , S Maltezos , V Malychev , F Mandl , J Marco , R Marco , B Marechal , M Margoni , Jc Marin , C Mariotti , A Markou , C Martinez-Rivero , F Martinez-Vidal , Smi Garcia , J Masik , N Mastroyiannopoulos , F Matorras , C Matteuzzi , G Matthiae , F Mazzucato , M Mazzucato , M Mccubbin , R Mckay , R Mcnulty , G Mcpherson , C Meroni , Wt Meyer , A Miagkov , E Migliore , L Mirabito , Wa Mitaroff , U Mjoernmark , T Moa , M Moch , R Moeller , K Moenig , Mr Monge , X Moreau , P Morettini , G Morton , U Mueller , K Muenich , M Mulders , C Mulet-Marquis , R Muresan , Wj Murray , B Muryn , G Myatt , T Myklebust , F Naraghi , M Nassiakou , Fl Navarria , S Navas , K Nawrocki , P Negri , N Neufeld , R Nicolaidou , Bs Nielsen , P Niezurawski , M Nikolenko , V Nomokonov , A Nygren , V Obraztsov , Ag Olshevski , A Onofre , R Orava , G Orazi , K Osterberg , A Ouraou , M Paganoni , S Paiano , R Pain , R Paiva , J Palacios , H Palka , Td Papadopoulou , K Papageorgiou , L Pape , C Parkes , F Parodi , U Parzefall , A Passeri , O Passon , T Pavel , M Pegoraro , L Peralta , M Pernicka , A Perrotta , C Petridou , A Petrolini , Ht Phillips , F Pierre , M Pimenta , E Piotto , T Podobnik , Me Pol , G Polok , P Poropat , V Pozdniakov , P Privitera , N Pukhaeva , A Pullia , D Radojicic , S Ragazzi , H Rahmani , J Rames , Pn Ratoff , Al Read , P Rebecchi , Ng Redaelli , M Regler , J Rehn , D Reid , R Reinhardt , Pb Renton , Lk Resvanis , F Richard , J Ridky , G Rinaudo , I Ripp-Baudot , O Rohne , A Romero , P Ronchese , Ei Rosenberg , P Rosinsky , P Roudeau , T Rovelli , C Royon , V Ruhlmann-Kleider , A Ruiz , H Saarikko , Y Sacquin , A Sadovsky , G Sajot , J Salt , D Sampsonidis , M Sannino , P Schwemling , B Schwering , U Schwickerath , F Scuri , P Seager , Y Sedykh , Am Segar , N Seibert , R Sekulin , Rc Shellard , M Siebel , L Simard , F Simonetto , An Sisakian , G Smadja , N Smirnov , O Smirnova , Gr Smith , A Sokolov , A Sopczak , R Sosnowski , T Spassov , E Spiriti , S Squarcia , C Stanescu , S Stanic , M Stanitzki , K Stevenson , A Stocchi , J Strauss , R Strub , B Stugu , M Szczekowski , M Szeptycka , T Tabarelli , A Taffard , F Tegenfeldt , F Terranova , J Thomas , J Timmermans , N Tinti , Lg Tkatchev , M Tobin , S Todorova , A Tomaradze , B Tome , A Tonazzo , L Tortora , P Tortosa , G Transtromer , D Treille , G Tristram , M Trochimczuk , C Troncon , Ml Turluer , Ia Tyapkin , S Tzamarias , O Ullaland , V Uvarov , G Valenti , E Vallazza , C Vander Velde , P Van Dam , W Van Den Boeck , Wk Van Doninck , J Van Eldik , A Van Lysebetten , N Van Remortel , I Van Vulpen , G Vegni , L Ventura , W Venus , F Verbeure , M Verlato , Ls Vertogradov , V Verzi , D Vilanova , L Vitale , E Vlasov , As Vodopyanov , G Voulgaris , V Vrba , H Wahlen , C Walck , Aj Washbrook , C Weiser , D Wicke , Jh Wickens , Gr Wilkinson , M Winter , M Witek , G Wolf , J Yi , O Yushchenko , A Zalewska , P Zalewski , D Savrtanik , E Zevgolatakos , Ni Zimin , A Zintchenko , P Zoller , Gc Zucchelli , G Zumerle PHYSICS LETTERS B（2000）
摘要
A study of b semileptonic decays into D, D pi(+/-) and D*pi(+/-) final states is presented. The D-0, D+ and D*(+) mesons are exclusively reconstructed in Z decay data recorded from 1992 to 1995 in the DELPHI experiment at LEP. The overall branching fractions are measured to be:BR(b --> D(0)l(-)<(upsilon)over bar>X-l) = (7.04 +/- 0.34(stat) +/- 0.36 (syst.exp) +/- 0.17(BRD))%,BR(b --> D(+)l(-)<(upsilon)over bar>X-l) = (2.72 +/- 0.19(stat) +/- 0.16(syst.exp) +/- 0.18(BRD))%,BR(b --> D*(+)l(-)<(upsilon)over bar>X-l) = (2.75 +/- 0.17(stat) +/- 0.13 (syst.exp) +/- 0.09 (BRD))%,where the D-0 and D+ results include also contributions from D*(0) and D*(+) decays. A fit to the distribution of the pi(+/-) impact parameter to the primary interaction vertex provides a measurement of the b semileptonic branching fractions into the D(0)pi(+/-)X, D(+)pi(+/-)X and D*(+)pi(+/-)X final states. Assuming that single pion decay modes of B mesons dominate, the partial rates for (B) over bar --> D pi l(-)<(upsilon)over bar>(l) and (B) over bar --> D*pi l(-)<(upsilon)over bar>(l) have been obtained, corresponding to a total branching fraction:BR((B) over bar --> D pi l(-)<(upsilon)over bar>(l)) + BR((B) over bar --> D*pi l(-)<(upsilon)over bar>(l)) = (3.40 +/- 0.52 (stat) +/- 0.32 (syst))%.This result agrees well with the observed difference between the total B semileptonic branching fraction and the sum of the (B) over bar --> Dl(-) upsilon(l) and D* l(-)<(upsilon)over bar>(l) branching fractions. (C) 2000 Elsevier Science B.V. All rights reserved.
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