A Precise Measurement of B Meson Lifetimes with Inclusive Dilepton Events

Details A Precise Measurement of B Meson Lifetimes with Inclusive Dilepton Events A Precise Measurement of B Meson Lifetimes with Inclusive Dilepton Events

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprs14012k&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We measure B meson lifetimes and lifetime ratio in a sample of B mesons selected and tagged via their semileptonic decays. To separate signal leptons from cascade and fake leptons we have used a method which combines several discriminating variables in a neural network. A slow pion tag was used to separate the sample into two independent samples with significantly different fractions of B^± events. With an integrated luminosity of 20.6 fb-1 collected on the Υ(4S) resonance by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the B meson lifetimes to be τ_B^0 = 1.557± 0.028(stat) ± 0.027(syst)± 0.004(Δ m) ps and τ_B^± = 1.655± 0.027(stat)± 0.027(syst)± 0.002(Δ m) ps. The lifetime ratio r_τ ≡ τ_B^± / τ_B^0 is measured as 1.064± 0.031(stat) ± 0.026(syst)± 0.002(Δ m).

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