Measurement of the branching fraction

K Doroba,M Battaglia,R Mc Nulty,R Mc Kay,M Mc Cubbin,J Dolbeau,M E Huber,K Huet, A Baroncelli, M Mazzucato,F Mazzucato,G Matthiae,C Matteuzzi,A Malek,L Di Ciaccio, N Ghodbane,D Jeans,E K Johansson,P Jonsson, C Joram,N Van Remortel, P Juillot,H Palka,Daniel Wicke,G J Barker,D Y Bardin, T Moa,I Gonzalez Caballero,P Goncalves,L Jungermann,R Barbier, G Barbiellini,F Barao, P Bambade, P Baillon,V Lefebure,L Leinonen,T Tabarelli,F Kapusta,K Karafasoulis,S Katsanevas,M Szeptycka,A Leisos,Th D Papadopoulou, L Mirabito,W Mitaroff,U Mjoernmark,A Zalewska,V Chorowicz,J Chudoba,K Cieslik,T Spassov,H M Blom, D Bloch,Ma Bizouard, M S Bilenky,A Behrmann,G Kernel,B P Kersevan,Jp Laugier,W De Boer,A De Angelis,N Demaria,P Zalewski, D Zavrtanik,R Leitner,M Szczekowski, W Liebig,J Libby,S Marti I Garcia,J Lemonne, G Lenzen, E Spiriti, M Lethuillier, A Hallgren,J Cuevas Maestro, F R Cavallo, A Cattai,M V Castillo Gimenez, C Caso,Linda J Carroll, J Hrubec,E Kriznic,P Kokkinias, V Kostioukhine,Manfred 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Gandelman,S Gamblin,C Muletmarquis,R Muresan,W J Murray,B Muryn,G Myatt,T Myklebust,F Naraghi,M Nassiakou, M E Pol,G Polok,B Marechal,G Tristram,S Squarcia,Cristian Stanescu,D Bertrand,P Poropat,V Pozdniakov,P Privitera,N Pukhaeva, A Pullia, D Radojicic,Stefano Ragazzi,H Rahmani,J Rames, P N Ratoff,B Stugu,R Strub,Josef Strauss,S Cabrera,P Buschmann,B Buschbeck, T Buran,T Lesiak,S Stanic, M Stanitzki,Kurt B Stevenson, A Stocchi,G Borisov, A L Read,P Rebecchi, N Redaelli,M Regler,J Rehn,D Reid,R Reinhardt,P Renton,L K Resvanis,F Richard,J Ridky,G Rinaudo,C Bosio, O Botner,I Rippbaudot, O Rohne, A Romero,D Gamba,A Galloni,Henk A Dijkstra,O Yushchenko,J Yi,G Wolf,M Witek,M Winter,L De Paula,A De Min,F Martinezvidal,G Wilkinson,J H Wickens,P Beilliere,R Sosnowski, P Chochula

Physics Letters B（2000）

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摘要

A study of b semileptonic decays into D, Dπ± and D∗π± final states is presented. The D0, 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→D0ℓ−ν̄ℓX)=(7.04±0.34(stat)±0.36(syst.exp)±0.17(BRD))%,BR(b→D+ℓ−ν̄ℓX)=(2.72±0.19(stat)±0.16(syst.exp)±0.18(BRD))%,BR(b→D∗+ℓ−ν̄ℓX)=(2.75±0.17(stat)±0.13(syst.exp)±0.09(BRD))%,where the D0 and D+ results include also contributions from D∗0 and D∗+ decays. A fit to the distribution of the π± impact parameter to the primary interaction vertex provides a measurement of the b semileptonic branching fractions into the D0π±X, D+π±X and D∗+π±X final states. Assuming that single pion decay modes of B mesons dominate, the partial rates for B̄→Dπℓ−νℓ̄ and B̄→D∗πℓ−νℓ̄ have been obtained, corresponding to a total branching fraction:BR(B̄→Dπℓ−νℓ̄)+BR(B̄→D∗πℓ−νℓ̄)=(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 B̄→Dℓ−νℓ̄ and D∗ℓ−νℓ̄ branching fractions.

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decay,resonance

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