Measurement of the anti-B0 and B- meson lifetimes - INSPIRE

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Measurement of the anti-B0 and B- meson lifetimes

ALEPH

Collaboration

•

D. Buskulic
(
- Annecy, LAPP
)

Mar, 1993

18 pages

Published in:

Phys.Lett.B 307 (1993) 194-208,
Phys.Lett.B 325 (1994) 537-538 (erratum)

DOI:

10.1016/0370-2693(93)90211-Y

PDG:

{{\mathit B}^{\pm}}

Report number:

CERN-PPE-93-42

Experiments:

CERN-LEP-ALEPH

View in:

CERN Document Server

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Abstract: (Elsevier)

The lifetimes of the B 0 and B − mesons have been measured with the ALEPH detector at LEP. Semileptonic decays of B 0 and B − mesons were partially reconstructed by identifying events containing a lepton with an associated D ∗+ or D 0 meson. The proper time of the B meson was estimated from the measured decay length and the momentum and mass of the D -lepton system. A fit to the proper time of 77 D ∗+ ℓ − and 77 D 0 ℓ − candidates, combined with a constraint on the lifetime ratio ( τ − τ 0 ) arising from the relative rates of observed D ∗+ ℓ − and D 0 ℓ − events, yielded the following lifetimes: τ 0 =1.52 −0.18 +0.20 ( stat. ) −0.13 +0.07 ( syst. ) ps , τ − = 1.47 −0.19 +0.22 ( stat. ) −0.14 +0.15 ( syst. ) ps , τ − τ 0 = 0.96 −0.15 +0.19 ( stat. ) −0.12 +0.18 ( syst. ) .

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
B: semileptonic decay
semileptonic decay: B

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