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Measurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE

The ALICE Collaboration at the LHC studies heavy-ion collisions to investigate the properties of the Quark-Gluon Plasma (QGP). Heavy quarks (charm and beauty) are effective probes for this purpose. Both their energy loss in the medium as well as their possible thermalization yield information about...

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Autor principal: Völk, Martin
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1742-6596/612/1/012037
http://cds.cern.ch/record/2159042
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author Völk, Martin
author_facet Völk, Martin
author_sort Völk, Martin
collection CERN
description The ALICE Collaboration at the LHC studies heavy-ion collisions to investigate the properties of the Quark-Gluon Plasma (QGP). Heavy quarks (charm and beauty) are effective probes for this purpose. Both their energy loss in the medium as well as their possible thermalization yield information about the medium properties. In ALICE, the reconstruction of exclusive decays is currently accessible for charm, but not for beauty hadrons. For hadrons with beauty valence quarks a promising strategy is the measurement of their decay electrons. To separate these from the background electrons (mainly from charm hadron decays, photon conversions or light-meson decays) the large decay length of beauty hadrons can be utilized. It leads to a relatively large typical impact parameter of the decay electrons. By comparing the impact parameter distribution of the signal electrons with those from the background sources, the signal can be statistically separated from the background. For this purpose a maximum likelihood fit is employed using impact parameter distribution templates from simulations. The resulting nuclear modification factor for electrons from beauty-hadron decays shows a sizeable suppression for p(T) > 3 GeV/c, albeit still with large uncertainties.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
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spelling oai-inspirehep.net-13719842019-09-30T06:29:59Zdoi:10.1088/1742-6596/612/1/012037http://cds.cern.ch/record/2159042engVölk, MartinMeasurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICEParticle Physics - ExperimentThe ALICE Collaboration at the LHC studies heavy-ion collisions to investigate the properties of the Quark-Gluon Plasma (QGP). Heavy quarks (charm and beauty) are effective probes for this purpose. Both their energy loss in the medium as well as their possible thermalization yield information about the medium properties. In ALICE, the reconstruction of exclusive decays is currently accessible for charm, but not for beauty hadrons. For hadrons with beauty valence quarks a promising strategy is the measurement of their decay electrons. To separate these from the background electrons (mainly from charm hadron decays, photon conversions or light-meson decays) the large decay length of beauty hadrons can be utilized. It leads to a relatively large typical impact parameter of the decay electrons. By comparing the impact parameter distribution of the signal electrons with those from the background sources, the signal can be statistically separated from the background. For this purpose a maximum likelihood fit is employed using impact parameter distribution templates from simulations. The resulting nuclear modification factor for electrons from beauty-hadron decays shows a sizeable suppression for p(T) > 3 GeV/c, albeit still with large uncertainties.oai:inspirehep.net:13719842015
spellingShingle Particle Physics - Experiment
Völk, Martin
Measurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE
title Measurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE
title_full Measurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE
title_fullStr Measurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE
title_full_unstemmed Measurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE
title_short Measurement of beauty-hadron decay electrons in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE
title_sort measurement of beauty-hadron decay electrons in pb–pb collisions at $\sqrt{s_{nn}}$ = 2.76 tev with alice
topic Particle Physics - Experiment
url https://dx.doi.org/10.1088/1742-6596/612/1/012037
http://cds.cern.ch/record/2159042
work_keys_str_mv AT volkmartin measurementofbeautyhadrondecayelectronsinpbpbcollisionsatsqrtsnn276tevwithalice