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Measurement of the Λb lifetime and mass

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Article number032002
<mark>Journal publication date</mark>4/02/2013
<mark>Journal</mark>Physical Review D – Particles and Fields
Issue number3
Volume87
Number of pages19
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A measurement of the Λb0 lifetime and mass in the decay channel Λb0→J/ψ(μ+μ-)Λ0(pπ-) is presented. The analysis uses a signal sample of about 2200 Λb0 and Λ̅ b0 decays that are reconstructed in 4.9  fb-1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Λb0 lifetime and mass. They are measured to be τΛb=1.449±0.036(stat)±0.017(syst)  ps and mΛb=5619.7±0.7(stat)±1.1(syst)  MeV.

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© 2013 CERN, for the ATLAS Collaboration