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  • Determination of ▫$|V_{ub}| / |V_{cb}|$▫ with DELPHI at LEP
    Abreu, P. ...
    The ratio of the CKM quark-mixing matrix elements |V[sub](ub)| / |V[sub](cb)| has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M[sub]X of the secondary ... hadronic system produced in association with an identified lepton. Since B [to] X[sub]u [ell] v[bar] transitions are characterised by hadronic masses below those of the D mesons produced in B [to] X[sub]c [ell] v[bar] transitions, events with a reconstructed value of M[sub]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 [to] u enriched and depleted samples with M[sub]X above and below 1.6 GeV/c[sup]2 and to the shapes of the lepton energy distribution in the B rest frame gives |V[sub](ub)| / |V[sub](cb)| = (0.103[sub]-0.012)[sup]+0.011 (stat.) [plus minus] 0.016(syst.) [plus minus] 0.010(model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B [to]X[sub]u [ell] v[bar]) = (1.57 [plus minus] 0.35 (stat.) [plus minus] 0.48 (syst.) [plus minus] 0.27(model)) [times] 10[sup]-3.
    Vir: Physics letters. Section B. - ISSN 0370-2693 (Vol. 478, 2000, str. 14-30)
    Vrsta gradiva - članek, sestavni del
    Leto - 2000
    Jezik - angleški
    COBISS.SI-ID - 124923

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