MEASUREMENT OF THE B0 AND B- MESON LIFETIMES IN ALEPH

The lifetimes of the [Formula: see text] and B- meson lifetimes are measured using data recorded on the Z peak with the ALEPH detector at LEP. An improved analysis based on partially reconstructed [Formula: see text] and [Formula: see text] decays is presented.

SEARCH FOR THE STANDARD MODEL HIGGS BOSON WITH THE ALEPH DETERCTOR AT LEP2

As the LEP collider at CERN has increased its maximum center-of-mass energy to 209 GeV, a total integrated luminosity of 99.8 pb -1 has been collected in the ALEPH detector. The ALEPH searches for Higgs bosons have been updated, But no firm evidence for Higgs production has been observed. Standard Model Higgs boson production is excluded at 95% confidence level for Higgs masses less than 111.1 GeV/c 2, and the combined LEP results exclude Higgs masses below 113.3 GeV/c 2. The recently-granted LEP extension will allow the a currently 2σ fluctuation from background expectation at m H = 115 GeV/c 2 to become more significant if it is truly due to Higgs production.