Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Tese |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | http://www.teses.usp.br/teses/disponiveis/43/43134/tde-29042019-053130/ |
Resumo: | In this thesis it is performed the measurement of electrons from heavy-flavor hadron decays, with the use of the ALICE detector, at LHC. Two analysis are performed. The first one consists in the measurement of the invariant cross section of electrons from open heavy-flavor (charm or beauty) hadron decays in pp collisions at s = 13 TeV, the largest center of mass energy generated by LHC up to now, in the transverse momentum interval 0.5 < pT < 4 GeV/c. The experimental cross-section is compared to the pQCD-based prediction given by FONLL, and it sits on the upper edge of the theoretical uncertainty band over the full momentum range. The ratios between this experimental result and the equivalent measurements performed at lower center of mass energy have the potential to bring constrains to the FONLL calculation. The second analysis consists in the measurement of the nuclear modification factor, RAA , of electrons from beauty-hadron decays in the 10% most central Pb-Pb collisions at sNN = 5.02 TeV, in the interval 2 < pT < 8 GeV/c. Electrons from beauty-hadron decays are extracted from the inclusive electron yield via fits to the impact parameter distribution using templates of electrons from different sources, obtained from Monte Carlo simulations. This measurement allows to probe the energy loss of beauty quarks when traversing the Quark-Gluon-Plasma (QGP), a color-deconfined medium produced in relativistic heavy-ion collisions. A suppression of about 40-50% is observed on the RAA for pT > 3 GeV/c and it is consistent, over the full momentum range and within experimental uncertainties, with the prediction of pQCD-based models that describe a mass-dependent energy loss of the heavy-quarks while traversing the QGP, interacting with its constituents via radiative and collisional processes. This analysis brings significant improvement of the experimental uncertainties with respect to the equivalent measurement performed with the run 1 data and consists in an important step in the study of the mass-dependence of the energy loss of heavy quarks inside the QGP at low pT . |
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Biblioteca Digital de Teses e Dissertações da USP |
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Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHCMedida de elétrons provenientes do decaimento de hadrons que contêm quarks pesados em colisões pp a s = 13 TeV e elétrons provenientes de hadrons que contêm quarks beauty em colisões Pb-Pb a sNN = 5.02 TeV pelo ALICE, no LHCBeauty quarks, Heavy-flavor electronsElétrons de heavy-flavor.Experimental physicsFsica experimentalHeavy quarksPlasma de quarks e glúonsQuark-Gluon-PlasmaQuarks pesados, Quarks beautyIn this thesis it is performed the measurement of electrons from heavy-flavor hadron decays, with the use of the ALICE detector, at LHC. Two analysis are performed. The first one consists in the measurement of the invariant cross section of electrons from open heavy-flavor (charm or beauty) hadron decays in pp collisions at s = 13 TeV, the largest center of mass energy generated by LHC up to now, in the transverse momentum interval 0.5 < pT < 4 GeV/c. The experimental cross-section is compared to the pQCD-based prediction given by FONLL, and it sits on the upper edge of the theoretical uncertainty band over the full momentum range. The ratios between this experimental result and the equivalent measurements performed at lower center of mass energy have the potential to bring constrains to the FONLL calculation. The second analysis consists in the measurement of the nuclear modification factor, RAA , of electrons from beauty-hadron decays in the 10% most central Pb-Pb collisions at sNN = 5.02 TeV, in the interval 2 < pT < 8 GeV/c. Electrons from beauty-hadron decays are extracted from the inclusive electron yield via fits to the impact parameter distribution using templates of electrons from different sources, obtained from Monte Carlo simulations. This measurement allows to probe the energy loss of beauty quarks when traversing the Quark-Gluon-Plasma (QGP), a color-deconfined medium produced in relativistic heavy-ion collisions. A suppression of about 40-50% is observed on the RAA for pT > 3 GeV/c and it is consistent, over the full momentum range and within experimental uncertainties, with the prediction of pQCD-based models that describe a mass-dependent energy loss of the heavy-quarks while traversing the QGP, interacting with its constituents via radiative and collisional processes. This analysis brings significant improvement of the experimental uncertainties with respect to the equivalent measurement performed with the run 1 data and consists in an important step in the study of the mass-dependence of the energy loss of heavy quarks inside the QGP at low pT .Nessa tese é feita a medida de elétrons provenientes do decaimento de hadrons que contêm quarks pesados (charm ou beauty), com o uso dos detectores do experimento ALICE, no LHC. Duas análises são realizadas. A primeira consiste na medida da seção de choque invariante de elétrons provenientes do decaimento de hadrons que contêm quarks charm ou beauty em colisões pp a s = 13 TeV, a maior energia de centro de massa gerada pelo LHC até então, na região de momento transversal 0.5 < pT < 4 GeV/c. Esse resultado é comparado com a previsão dada pelo FONLL (calculo baseado em QCD perturbativa) e se situa no limite superior da incerteza teórica, sobre toda a faixa de momento. As razões entre este resultado experimental e medidas equivalentes realizadas em mais baixa energia podem trazer informações importantes para tornar o cálculo teórico mais preciso. A segunda análise consiste na medida do fator de modificação nuclear, RAA , de elétrons provenientes do decaimento de hadrons que contêm quarks beauty, em colisões centrais de Pb-Pb a sNN = 5.02 TeV, no intervalo 2 < pT < 8 GeV/c. Elétrons provenientes de hadrons que contêm quarks beauty são extrados do conjunto de elétrons inclusivos a partir do ajuste da distribuição do parâmetro de impacto com templates de elétrons de diferentes fontes, extrados de simulações de Monte Carlo. Essa medida permite estudar a perda de energia dos quarks beauty ao atravessarem o Plasma de Quarks e Glúons (QGP), produzido em colisões entre ons pesados em altas energias. É observada uma supressão de 40-50% no RAA medido para pT > 3 GeV/c e esta é consistente, sobre toda a faixa de p T , com a previsão de modelos baseados em pQCD, que descrevem a perda de energia dos quarks pesados via processos elásticos e inelásticos com os constituintes do QGP, de maneira dependente da massa. Este resultado possui incertezas experimentais significativamente menores com relação à medida realizada com dados do run 1 e consiste num importante passo no estudo da dependência em massa da perda de energia dos quarks pesados no QGP em baixo pT .Biblioteca Digitais de Teses e Dissertações da USPMunhoz, Marcelo GameiroConti, Camila de2019-03-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfhttp://www.teses.usp.br/teses/disponiveis/43/43134/tde-29042019-053130/reponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USPLiberar o conteúdo para acesso público.info:eu-repo/semantics/openAccesseng2019-06-07T18:07:23Zoai:teses.usp.br:tde-29042019-053130Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212019-06-07T18:07:23Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC Medida de elétrons provenientes do decaimento de hadrons que contêm quarks pesados em colisões pp a s = 13 TeV e elétrons provenientes de hadrons que contêm quarks beauty em colisões Pb-Pb a sNN = 5.02 TeV pelo ALICE, no LHC |
title |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC |
spellingShingle |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC Conti, Camila de Beauty quarks, Heavy-flavor electrons Elétrons de heavy-flavor. Experimental physics Fsica experimental Heavy quarks Plasma de quarks e glúons Quark-Gluon-Plasma Quarks pesados, Quarks beauty |
title_short |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC |
title_full |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC |
title_fullStr |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC |
title_full_unstemmed |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC |
title_sort |
Measurement of electrons from open heavy-flavor hadron decays in pp at s = 13 TeV and electrons from beauty-hadron decays in Pb-Pb at sNN = 5.02 TeV collisions by ALICE at LHC |
author |
Conti, Camila de |
author_facet |
Conti, Camila de |
author_role |
author |
dc.contributor.none.fl_str_mv |
Munhoz, Marcelo Gameiro |
dc.contributor.author.fl_str_mv |
Conti, Camila de |
dc.subject.por.fl_str_mv |
Beauty quarks, Heavy-flavor electrons Elétrons de heavy-flavor. Experimental physics Fsica experimental Heavy quarks Plasma de quarks e glúons Quark-Gluon-Plasma Quarks pesados, Quarks beauty |
topic |
Beauty quarks, Heavy-flavor electrons Elétrons de heavy-flavor. Experimental physics Fsica experimental Heavy quarks Plasma de quarks e glúons Quark-Gluon-Plasma Quarks pesados, Quarks beauty |
description |
In this thesis it is performed the measurement of electrons from heavy-flavor hadron decays, with the use of the ALICE detector, at LHC. Two analysis are performed. The first one consists in the measurement of the invariant cross section of electrons from open heavy-flavor (charm or beauty) hadron decays in pp collisions at s = 13 TeV, the largest center of mass energy generated by LHC up to now, in the transverse momentum interval 0.5 < pT < 4 GeV/c. The experimental cross-section is compared to the pQCD-based prediction given by FONLL, and it sits on the upper edge of the theoretical uncertainty band over the full momentum range. The ratios between this experimental result and the equivalent measurements performed at lower center of mass energy have the potential to bring constrains to the FONLL calculation. The second analysis consists in the measurement of the nuclear modification factor, RAA , of electrons from beauty-hadron decays in the 10% most central Pb-Pb collisions at sNN = 5.02 TeV, in the interval 2 < pT < 8 GeV/c. Electrons from beauty-hadron decays are extracted from the inclusive electron yield via fits to the impact parameter distribution using templates of electrons from different sources, obtained from Monte Carlo simulations. This measurement allows to probe the energy loss of beauty quarks when traversing the Quark-Gluon-Plasma (QGP), a color-deconfined medium produced in relativistic heavy-ion collisions. A suppression of about 40-50% is observed on the RAA for pT > 3 GeV/c and it is consistent, over the full momentum range and within experimental uncertainties, with the prediction of pQCD-based models that describe a mass-dependent energy loss of the heavy-quarks while traversing the QGP, interacting with its constituents via radiative and collisional processes. This analysis brings significant improvement of the experimental uncertainties with respect to the equivalent measurement performed with the run 1 data and consists in an important step in the study of the mass-dependence of the energy loss of heavy quarks inside the QGP at low pT . |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-03-12 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.teses.usp.br/teses/disponiveis/43/43134/tde-29042019-053130/ |
url |
http://www.teses.usp.br/teses/disponiveis/43/43134/tde-29042019-053130/ |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
|
dc.rights.driver.fl_str_mv |
Liberar o conteúdo para acesso público. info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Liberar o conteúdo para acesso público. |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.coverage.none.fl_str_mv |
|
dc.publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
_version_ |
1815257418684170240 |