Measurement of the Λb0 Lifetime in Λb0→Λc+π- Decays in pp̅ Collisions at √s=1.96  TeV

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URI: http://hdl.handle.net/10902/2002
ISSN: 0031-9007
ISSN: 1079-7114
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Author
Aaltonen, Timo Antero; Álvarez González, Bárbara; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, Gervasio; Rodrigo Anoro, TeresaAutoridad Unican; Ruiz Jimeno, AlbertoAutoridad Unican; Scodellaro, Luca; Vila Álvarez, Iván; Vilar Cortabitarte, RocíoAutoridad Unican
Date
2010-03-11
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© 2010 The American Physical Society
Publicado en
Physical Review Letters, 2010, 104, 102002
Publisher
American Physical Society
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Abstract:
We report a measurement of the lifetime of the Λb0 baryon in decays to the Λc+π- final state in a sample corresponding to 1.1  fb-1 collected in pp̅ collisions at √s=1.96  TeV by the CDF II detector at the Tevatron collider. Using a sample of about 3000 fully reconstructed Λb0 events we measure τ(Λb0)=1.401±0.046(stat)±0.035(syst)  ps (corresponding to cτ(Λb0)=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 B0 lifetime yields τ(Λb0)/τ(B0)=0.918±0.038 (stat) and (syst), in good agreement with recent theoretical predictions.
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