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Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC

The production of low-mass dielectrons is one of the most promising tools to understand the properties of the quark--gluon plasma (QGP) created in ultra-relativistic heavy-ion collisions. In this contribution, heavy-flavor ($\rm c\bar{c}$ and $\rm b\bar{b}$) production in pp and p--Pb collisions at...

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Autor principal: Sekihata, Daiki
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.387.0047
http://cds.cern.ch/record/2798710
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author Sekihata, Daiki
author_facet Sekihata, Daiki
author_sort Sekihata, Daiki
collection CERN
description The production of low-mass dielectrons is one of the most promising tools to understand the properties of the quark--gluon plasma (QGP) created in ultra-relativistic heavy-ion collisions. In this contribution, heavy-flavor ($\rm c\bar{c}$ and $\rm b\bar{b}$) production in pp and p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV and the soft-dielectron excess in pp collisions at $\sqrt{s}$ = 13 TeV are presented. Dielectron production in p--Pb collisions plays an important role to investigate initial-state effects due to the presence of the cold nuclear matter in the collision. Heavy-flavor production cross sections have been extracted from the intermediate mass region by fitting to the dielectron invariant mass ($m_{\rm ee}$) and pair transverse momentum ($p_{\rm T,ee}$) in pp and p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, and the nuclear modification factor $R_{\rm pPb}$ as a function of $m_{\rm ee}$ is firstly extracted at the LHC energy. Results in pp collisions at $\sqrt{s}$ = 13 TeV with the reduced solenoid magnetic field at 0.2 T, allowing us to test very soft dielectron production, are also presented. An excess in the yields is observed at very low $p_{\rm T,ee}$ and the observed excess is described by neither hadronic bremsstrahlung nor thermal radiation.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2021
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spelling cern-27987102021-12-23T20:32:46Zdoi:10.22323/1.387.0047http://cds.cern.ch/record/2798710engSekihata, DaikiLow-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHCNuclear Physics - ExperimentParticle Physics - ExperimentThe production of low-mass dielectrons is one of the most promising tools to understand the properties of the quark--gluon plasma (QGP) created in ultra-relativistic heavy-ion collisions. In this contribution, heavy-flavor ($\rm c\bar{c}$ and $\rm b\bar{b}$) production in pp and p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV and the soft-dielectron excess in pp collisions at $\sqrt{s}$ = 13 TeV are presented. Dielectron production in p--Pb collisions plays an important role to investigate initial-state effects due to the presence of the cold nuclear matter in the collision. Heavy-flavor production cross sections have been extracted from the intermediate mass region by fitting to the dielectron invariant mass ($m_{\rm ee}$) and pair transverse momentum ($p_{\rm T,ee}$) in pp and p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, and the nuclear modification factor $R_{\rm pPb}$ as a function of $m_{\rm ee}$ is firstly extracted at the LHC energy. Results in pp collisions at $\sqrt{s}$ = 13 TeV with the reduced solenoid magnetic field at 0.2 T, allowing us to test very soft dielectron production, are also presented. An excess in the yields is observed at very low $p_{\rm T,ee}$ and the observed excess is described by neither hadronic bremsstrahlung nor thermal radiation.oai:cds.cern.ch:27987102021
spellingShingle Nuclear Physics - Experiment
Particle Physics - Experiment
Sekihata, Daiki
Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
title Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
title_full Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
title_fullStr Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
title_full_unstemmed Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
title_short Low-mass dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
title_sort low-mass dielectron measurements in pp, p-pb and pb-pb collisions with alice at the lhc
topic Nuclear Physics - Experiment
Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.387.0047
http://cds.cern.ch/record/2798710
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