Measurement of the Λ[superscript 0 over subscript b] lifetime and mass in the ATLAS experiment
A measurement of the Λ[superscript 0 over subscript b] lifetime and mass in the decay channel Λ[superscript 0 over subscript b]→J/ψ(μ[superscript +]μ[superscript -])Λ[superscript 0](pπ[superscript -]) is presented. The analysis uses a signal sample of about 2200 Λ[superscript 0 over subscript b] and...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/78613 https://orcid.org/0000-0002-7586-7253 |
| Summary: | A measurement of the Λ[superscript 0 over subscript b] lifetime and mass in the decay channel Λ[superscript 0 over subscript b]→J/ψ(μ[superscript +]μ[superscript -])Λ[superscript 0](pπ[superscript -]) is presented. The analysis uses a signal sample of about 2200 Λ[superscript 0 over subscript b] and Λ̅ [superscript 0 over subscript b] decays that are reconstructed in 4.9 fb[superscript -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 Λ[superscript 0 over subscript b] lifetime and mass. They are measured to be τ[subscript Λb]=1.449±0.036(stat)±0.017(syst) ps and mΛb=5619.7±0.7(stat)±1.1(syst) MeV. |
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