Measurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experiment

A measurement of the helicity amplitudes and the parity violating decay asymmetry parameter, $\alpha_b$ for the $\Lambda_b^0$ hyperon decay $\Lambda_b^0\to J/\psi\Lambda^0$ is reported. The analysis is based on about 1400 $\Lambda_b^0$ and $\bar{\Lambda}_b^0$ baryons selected in 4.6 fb$^{-1}$ of pro...

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Detalles Bibliográficos
Autores principales: Cheng, H, Zhang, D
Lenguaje:eng
Publicado: 2014
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/1665455
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author Cheng, H
Zhang, D
author_facet Cheng, H
Zhang, D
author_sort Cheng, H
collection CERN
description A measurement of the helicity amplitudes and the parity violating decay asymmetry parameter, $\alpha_b$ for the $\Lambda_b^0$ hyperon decay $\Lambda_b^0\to J/\psi\Lambda^0$ is reported. The analysis is based on about 1400 $\Lambda_b^0$ and $\bar{\Lambda}_b^0$ baryons selected in 4.6 fb$^{-1}$ of proton-proton collision data recorded by the ATLAS experiment at the LHC with a center-of-mass energy of 7 TeV. By combining the $\Lambda_b^0$ and $\bar{\Lambda}_b^0$ samples under the assumption of CP conservation, the value of $\alpha_b$ was measured to be $0.28\pm0.16 ({\rm stat})\pm 0.06 ({\rm syst})$.
id cern-1665455
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2014
record_format invenio
spelling cern-16654552019-09-30T06:29:59Zhttp://cds.cern.ch/record/1665455engCheng, HZhang, DMeasurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experimentDetectors and Experimental TechniquesA measurement of the helicity amplitudes and the parity violating decay asymmetry parameter, $\alpha_b$ for the $\Lambda_b^0$ hyperon decay $\Lambda_b^0\to J/\psi\Lambda^0$ is reported. The analysis is based on about 1400 $\Lambda_b^0$ and $\bar{\Lambda}_b^0$ baryons selected in 4.6 fb$^{-1}$ of proton-proton collision data recorded by the ATLAS experiment at the LHC with a center-of-mass energy of 7 TeV. By combining the $\Lambda_b^0$ and $\bar{\Lambda}_b^0$ samples under the assumption of CP conservation, the value of $\alpha_b$ was measured to be $0.28\pm0.16 ({\rm stat})\pm 0.06 ({\rm syst})$.ATL-PHYS-SLIDE-2014-082oai:cds.cern.ch:16654552014-02-27
spellingShingle Detectors and Experimental Techniques
Cheng, H
Zhang, D
Measurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experiment
title Measurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experiment
title_full Measurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experiment
title_fullStr Measurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experiment
title_full_unstemmed Measurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experiment
title_short Measurement of helicity amplitudes of the decay $\Lambda_b^0 \to J/\psi +\Lambda^0$ in the ATLAS experiment
title_sort measurement of helicity amplitudes of the decay $\lambda_b^0 \to j/\psi +\lambda^0$ in the atlas experiment
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1665455
work_keys_str_mv AT chengh measurementofhelicityamplitudesofthedecaylambdab0tojpsilambda0intheatlasexperiment
AT zhangd measurementofhelicityamplitudesofthedecaylambdab0tojpsilambda0intheatlasexperiment

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