Mostra el registre parcial de l'element
dc.contributor.author | DELPHI Collaboration | |
dc.contributor.author | Cabrera Urbán, Susana | |
dc.contributor.author | Castillo Giménez, María Victoria | |
dc.contributor.author | Cortina Gil, Eduardo | |
dc.contributor.author | Ferrer Soria, Antonio | |
dc.contributor.author | Fuster Verdú, Juan A. | |
dc.contributor.author | García García, Carmen | |
dc.contributor.author | Gil Botella, Inés | |
dc.contributor.author | Hernández Rey, Juan José | |
dc.contributor.author | Higón Rodríguez, Emilio | |
dc.contributor.author | Ferrer Soria, Antonio | |
dc.contributor.author | Tortosa Martínez, Pablo | |
dc.date.accessioned | 2014-03-28T13:33:39Z | |
dc.date.available | 2014-03-28T13:33:39Z | |
dc.date.issued | 2000 | |
dc.identifier.citation | DELPHI Collaboration Cabrera Urbán, Susana Castillo Giménez, María Victoria A. Ferrer Cortina, E. Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gil, I. Hernández Rey, Juan José Higón Rodríguez, Emilio Ferrer Soria, Antonio ,Tortosa Martínez, Pablo, 2000 Measurement of the B¯-- >D(*)πlν¯l branching fraction Physics Letters B 475 407 428 | |
dc.identifier.uri | http://hdl.handle.net/10550/33764 | |
dc.description.abstract | A study of b semileptonic decays into D, D pi+- and D* pi+- 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 -> D^0 \ell^- \bar{\nu}_{\ell} X) = (7.04 +/- 0.34 (stat) +/- 0.36 (syst.exp) +/- 0.17 (BR_D))% BR(b -> D^+ \ell^- \bar{\nu}_{\ell} X) = (2.72 +/- 0.19 (stat) +/- 0.16 (syst.exp) +/- 0.18 (BR_D))% BR(b -> D^{*+} \ell^- \bar{\nu}_{\ell} X) = (2.75 +/- 0.17 (stat) +/- 0.13 (syst.exp) +/- 0.09 (BR_D))% where the D0 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 D0 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 \bar{B} -> D \pi \ell^- \bar{\nu_{\ell}} and \bar{B} -> D^{*} \pi \ell^- \bar{\nu_{\ell}} have been obtained, corresponding to a total branching fraction: BR(\bar{B} -> D \pi \ell^- \bar{\nu_{\ell}}) + BR(\bar{B} -> D^{*} \pi \ell^- \bar{\nu_{\ell}}) = (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 \bar{B} -> D \ell^- \bar{\nu_{\ell}} and D^* \ell^- \bar{\nu_{\ell}} branching fractions. | |
dc.relation.ispartof | Physics Letters B, 2000, vol. 475, p. 407-428 | |
dc.subject | Física nuclear | |
dc.subject | Partícules (Física nuclear) | |
dc.title | Measurement of the B¯-- >D(*)πlν¯l branching fraction | |
dc.type | journal article | es_ES |
dc.date.updated | 2014-03-28T13:33:39Z | |
dc.identifier.doi | 10.1016/S0370-2693(00)00040-X | |
dc.identifier.idgrec | 006696 | |
dc.rights.accessRights | open access | es_ES |
dc.identifier.url | 10.1016/S0370-2693(00)00040-X |