Measurement of the Λb0 lifetime and mass in the ATLAS experiment

Bartsch, V, Cerri, A, De Santo, A, Martin-Haugh, S, Potter, C J, Rose, A, Salvatore, F, Sutton, M R, Vivarelli, I and and the ATLAS Collaboration, (2013) Measurement of the Λb0 lifetime and mass in the ATLAS experiment. Physical Review D, 87 (3). 032002-032021. ISSN 1550-7998

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A measurement of the Λ0b lifetime and mass in the decay channel Λ0b → J/ψ(μ+μ−)Λ0(pπ−) is presented. The analysis uses a signal sample of about 2200 Λ0b and Λ ̄0b 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 Λ0b 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Alessandro Cerri
Date Deposited: 19 Aug 2013 14:05
Last Modified: 15 Mar 2017 01:07

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