Ερευνητικό υλικό ΕΚΠΑ

Determination of vertical bar V-ub vertical bar/vertical bar V-cb
vertical bar with DELPHI at LEP

Αγγλικά

{The ratio of the CKM quark-mixing matrix elements
\textbackslash{}V-ub\textbackslash{}/\textbackslash{}V-cb\textbackslash{
} 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)l (v)
over bar transitions are characterised by hadronic masses below those of
the D mesons produced in B --> X(c)l (v) over bar 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
\textbackslash{}V-ub\textbackslash{}/\textbackslash{}V-cb\textbackslash{
} = 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)l (v) over bar)= (1.57 +/- 0.35 (stat.) +/-
0.48(syst.) +/- 0.27(model)) x 10(-3). (C) 2000 Published by Elsevier
Science B.V. All rights reserved.}

2000

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Adam, W
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Albrecht, Z and
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Alekseev, GD
Alemany, R
Allmendinger, T and
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DELPHI Collaboration

PHYSICS LETTERS B

Elsevier

478

1-3

14-30

https://doi.org/10.1016/S0370-2693(00)00281-1

10.1016/S0370-2693(00)00281-1

https://pergamos.lib.uoa.gr/uoa/dl/object/3053282