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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana
Perfil; Castillo Giménez, María Victoria
Perfil; Cortina Gil, Eduardo; Ferrer Soria, Antonio
Perfil; Fuster Verdú, Juan A.
Perfil; García García, Carmen
Perfil; Gil Botella, Inés; Hernández Rey, Juan José
Perfil; Higón Rodríguez, Emilio
Perfil; Martínez Vidal, Fernando
Perfil; Navas Concha, Sergio; Salt Cairols, José
Perfil |
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This document is a artículoDate2000
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Este documento está disponible también en :
http://dx.doi.org/10.1016/S0370-2693(00)00281-1
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Este documento está disponible también en :
http://hdl.handle.net/10550/33800
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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}.
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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 |
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http://dx.doi.org/10.1016/S0370-2693(00)00281-1
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