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Measurement of the B¯-- >D(*)πlν¯l branching fraction

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Measurement of the B¯-- >D(*)πlν¯l branching fraction

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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 D0 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