Measurement of the Λ[superscript 0][subscript b] Lifetime in Λ[superscript 0][subscript b] → Λ[superscript +][subscript c]π[subscript −] Decays in p[¯ over p] Collisions at √s = 1.96 TeV
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PhysRevLett.104.102002.pdf
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Author(s)
Bauer, Gerry P
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Date Issued
March 2010
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaltonen, T., et al. “Measurement of the Λ[superscript 0][subscript b] Lifetime in Λ[superscript 0][subscript b] → Λ[superscript +][subscript c]π[subscript −] Decays in p[¯ over p] Collisions at √s = 1.96 TeV.” Physical Review Letters, vol. 104, no. 10, Mar. 2010. ©2010 American Physical Society
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Final published version
Abstract
We report a measurement of the lifetime of the Λ[superscript 0][subscript b] baryon in decays to the Λ[superscript +][superscript c]π[superscript −] final state in a sample corresponding to 1.1 fb[superscript −1] collected in p[¯ over p] collisions at √s=1.96 TeV by the CDF II detector at the Tevatron collider. Using a sample of about 3000 fully reconstructed Λ[superscript 0][subscript b] events we measure τ(Λ[superscript 0][subscript b]) =1.401±0.046(stat)±0.035(syst) ps (corresponding to cτ(Λ[superscript 0][subscript b])=420.1±13.7(stat)±10.6(syst) μm, where c is the speed of light). The ratio of this result and the world average B[superscript 0] lifetime yields
τ(Λ[superscript 0][subscript b])/τ(B[superscript 0])=0.918±0.038 (stat) and (syst), in good agreement with recent theoretical predictions. © 2010 American Physical Society
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.104.102002
