Measurement of the Λ<SUP>0</SUP><SUB>b</SUB> lifetime and mass in the ATLAS experiment

A measurement of the Λ<SUP>0</SUP><SUB>b</SUB> lifetime and mass in the decay channel Λ<SUP>0</SUP><SUB>b</SUB> →J/ψ(μ<SUP>+</SUP>μ¯)Λ<SUP>0</SUP>(pπ¯) is presented. The analysis uses a signal sample of about 2200 Λ<SUP>0&...

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Detalles Bibliográficos
Autores principales:	Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2013
Materias:	Ciencias Exactas Física Collisions Proton–proton collisions
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/85372
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

Descripción
Sumario:	A measurement of the Λ<SUP>0</SUP><SUB>b</SUB> lifetime and mass in the decay channel Λ<SUP>0</SUP><SUB>b</SUB> →J/ψ(μ<SUP>+</SUP>μ¯)Λ<SUP>0</SUP>(pπ¯) is presented. The analysis uses a signal sample of about 2200 Λ<SUP>0</SUP><SUB>b</SUB> and Λ¯<SUP>0</SUP><SUB>b</SUB> decays that are reconstructed in 4.9 fb<SUP>-1</SUP> 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<SUP>0</SUP><SUB>b</SUB> lifetime and mass. They are measured to be τ<SUB>Λ<sub>b</sub></SUB>=1.449±0.036(stat) ±0.017(syst) ps and m<SUB>Λ<sub>b</sub></SUB>=5619.7±0. 7(stat)±1.1(syst) MeV.