Time-dependent angular analysis of the decay B<sup>0</sup><sub>s</sub> → J/ψφ and extraction of ΔΓ<sub>s</sub> and the CP-violating weak phase φ<sub>s</sub> by ATLAS

A measurement of B<sup>0</sup><sub>s</sub> → J/ψϕ decay parameters, including the CP-violating weak phase ϕ<sub>s</sub> and the decay width difference ΔΓ<sub>s</sub> is reported, using 4.9 fb<sub>−1</sub> of integrated luminosity collected...

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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:Español
Publicado: 2012
Materias:
Física
Hadron-hadron scattering
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/81238
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-81238
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Física
Hadron-hadron scattering
spellingShingle Física
Hadron-hadron scattering
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Time-dependent angular analysis of the decay B<sup>0</sup><sub>s</sub> → J/ψφ and extraction of ΔΓ<sub>s</sub> and the CP-violating weak phase φ<sub>s</sub> by ATLAS
topic_facet Física
Hadron-hadron scattering
description A measurement of B<sup>0</sup><sub>s</sub> → J/ψϕ decay parameters, including the CP-violating weak phase ϕ<sub>s</sub> and the decay width difference ΔΓ<sub>s</sub> is reported, using 4.9 fb<sub>−1</sub> of integrated luminosity collected in 2011 by the ATLAS detector from LHC pp collisions at a centre-of-mass energy √s = 7 TeV. The mean decay width Γ<sub>s</sub> and the transversity amplitudes |A<sub>0</sub>(0)|<sup>2</sup> and |A<sub>∥</sub>(0)|<sup>2</sup> are also measured. The values reported for these parameters are: ϕ<sub>s</sub> = 0.22 ± 0.41 (stat.) ± 0.10 (syst.) rad ΔΓ<sub>s</sub> = 0.053 ± 0.021 (stat.) ± 0.010 (syst.) ps<sup>−1</sup> Γ<sub>s</sub> = 0.677 ± 0.007 (stat.) ± 0.004 (syst.) ps<sup>−1</sup> |A<sub>0</sub>(0)|<sup>2</sup> = 0.528 ± 0.006 (stat.) ± 0.009 (syst.) |A<sub>∥</sub>(0)|<sup>2</sup> = 0.220 ± 0.008 (stat.) ± 0.007 (syst.) where the values quoted for ϕ<sub>s</sub> and ΔΓ<sub>s</sub> correspond to the solution compatible with the external measurements to which the strong phase δ⊥ is constrained and where ΔΓ<sub>s</sub> is constrained to be positive. The fraction of S-wave KK or f<sub>0</sub> contamination through the decays Bsup>0</sup><sub>s</sub> → J/ψK+K− (f<sub>0</sub>) is measured as well and is found to be consistent with zero. Results for ϕ<sub>s</sub> and ΔΓ<sub>s</sub> are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations.
format Articulo
Articulo
author Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Alonso, Francisco
title Time-dependent angular analysis of the decay B<sup>0</sup><sub>s</sub> → J/ψφ and extraction of ΔΓ<sub>s</sub> and the CP-violating weak phase φ<sub>s</sub> by ATLAS
title_short Time-dependent angular analysis of the decay B<sup>0</sup><sub>s</sub> → J/ψφ and extraction of ΔΓ<sub>s</sub> and the CP-violating weak phase φ<sub>s</sub> by ATLAS
title_full Time-dependent angular analysis of the decay B<sup>0</sup><sub>s</sub> → J/ψφ and extraction of ΔΓ<sub>s</sub> and the CP-violating weak phase φ<sub>s</sub> by ATLAS
title_fullStr Time-dependent angular analysis of the decay B<sup>0</sup><sub>s</sub> → J/ψφ and extraction of ΔΓ<sub>s</sub> and the CP-violating weak phase φ<sub>s</sub> by ATLAS
title_full_unstemmed Time-dependent angular analysis of the decay B<sup>0</sup><sub>s</sub> → J/ψφ and extraction of ΔΓ<sub>s</sub> and the CP-violating weak phase φ<sub>s</sub> by ATLAS
title_sort time-dependent angular analysis of the decay b<sup>0</sup><sub>s</sub> → j/ψφ and extraction of δγ<sub>s</sub> and the cp-violating weak phase φ<sub>s</sub> by atlas
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/81238
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