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Determination of |Vub|/|Vcb| with DELPHI at LEP

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Determination of |Vub|/|Vcb| with DELPHI at LEP

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Alemany Fernández, Reyes
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	Martínez Vidal, Fernando
dc.contributor.author	Navas Concha, Sergio
dc.contributor.author	Salt Cairols, José
dc.date.accessioned	2014-03-29T12:20:53Z
dc.date.available	2014-03-29T12:20:53Z
dc.date.issued	2000
dc.identifier.citation	DELPHI Collaboration Alemany, R. Cabrera Urbán, Susana Castillo Giménez, María Victoria Cortina, E. Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gil, I. Hernández Rey, Juan José Higón Rodríguez, Emilio Martínez Vidal, Fernando Navas, S. Salt Cairols, José 2000 Determination of \|Vub\|/\|Vcb\| with DELPHI at LEP Physics Letters B 478 14 30
dc.identifier.uri	http://hdl.handle.net/10550/33800
dc.description.abstract	The ratio of the CKM quark-mixing matrix elements \|Vub\|/\|Vcb\| has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M_X of the secondary hadronic system produced in association with an identified lepton. Since B -> X_u lepton anti-nu transitions are characterised by hadronic masses below those of the D mesons produced in B -> X_c lepton anti-nu transitions, events with a reconstructed value of M_X significantly below the D mass are selected. Further signal enrichments are obtained using the topology of reconstructed decays and hadron identification. A fit to the numbers of decays in the b -> u enriched and depleted samples with M_X above and below 1.6 GeV/c^2 and to the shapes of the lepton energy distribution in the B rest frame gives \|Vub\|/\|Vcb\|= 0.103^{+0.011}_{-0.012} (stat.) +/- 0.016 (syst.) +/- 0.010 (model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B -> X_u lepton anti-nu) = (1.57 +/- 0.35 (stat.) +/- 0.48 (syst.) +/- 0.27 (model)) x 10^{-3}.
dc.relation.ispartof	Physics Letters B, 2000, vol. 478, p. 14-30
dc.subject	Física nuclear
dc.subject	Partícules (Física nuclear)
dc.title	Determination of \|Vub\|/\|Vcb\| with DELPHI at LEP
dc.type	journal article	es_ES
dc.date.updated	2014-03-29T12:20:53Z
dc.identifier.doi	10.1016/S0370-2693(00)00281-1
dc.identifier.idgrec	006705
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1016/S0370-2693(00)00281-1