Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector

A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ<sup>0</sup>b→J/ψ(μ+μ-)Λ<sup>0</sup>(pπ-) is reported. The analysis is based on 1400 Λ<sup>0</sup>b and Λ<sup>0</sup>¯b baryons selected in...

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Física
Ciencias Exactas
Parity-violating asymmetry
ATLAS detector
Quantum chromodynamics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85215
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85215
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Ciencias Exactas
Parity-violating asymmetry
ATLAS detector
Quantum chromodynamics
spellingShingle Física
Ciencias Exactas
Parity-violating asymmetry
ATLAS detector
Quantum chromodynamics
Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector
topic_facet Física
Ciencias Exactas
Parity-violating asymmetry
ATLAS detector
Quantum chromodynamics
description A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λ<sup>0</sup>b→J/ψ(μ+μ-)Λ<sup>0</sup>(pπ-) is reported. The analysis is based on 1400 Λ<sup>0</sup>b and Λ<sup>0</sup>¯b baryons selected in 4.6 fb-1 of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λb0 and Λ<sup>0</sup>¯b samples under the assumption of CP conservation, the value of αb is measured to be 0.30±0.16(stat)±0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector
title_short Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector
title_full Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector
title_fullStr Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector
title_full_unstemmed Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λ<sup>0</sup>b →j /ψ Λ<sup>0</sup> with the ATLAS detector
title_sort measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay λ<sup>0</sup>b →j /ψ λ<sup>0</sup> with the atlas detector
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85215
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