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Electroweak bosons in Pb+Pb and p+Pb collisions from ATLAS
Electroweak boson ($W$, $Z$, $\gamma$) measurements in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV and in $p$+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV are presented with the ATLAS detector at the LHC. In Pb+Pb, electroweak boson yields are shown to be independent of centrality. Differential measur...
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Lenguaje: | eng |
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2015
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Acceso en línea: | http://cds.cern.ch/record/2064962 |
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author | Balestri, Thomas |
author_facet | Balestri, Thomas |
author_sort | Balestri, Thomas |
collection | CERN |
description | Electroweak boson ($W$, $Z$, $\gamma$) measurements in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV and in $p$+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV are presented with the ATLAS detector at the LHC. In Pb+Pb, electroweak boson yields are shown to be independent of centrality. Differential measurements in absolute pseudorapidity are used to investigate nuclear effects to the free-proton parton distribution function (PDF). The distributions lack the experimental precision to unambiguously identify the presence of nuclear modifications. In $p$+Pb, the $Z$ boson cross section is measured as a function of center-of-mass rapidity $y_{Z}^{*}$ and the momentum fraction of the lead-going parton (Bjorken $x_{Pb}$). The distributions are asymmetric and model predictions underestimate the data at large $x_{Pb}$. The overall shape is best described by including nuclear effects. The differential cross section is also measured in different centrality classes and shows evidence of spatially-dependent nuclear PDFs. The $Z$ boson production yields are measured as a function of the mean number of participants using Glauber and Glauber-Gribov color fluctuation models. Binary scaling of the yields is observed utilizing the standard Glauber model after applying a centrality-bias correction. |
id | cern-2064962 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2015 |
record_format | invenio |
spelling | cern-20649622023-03-14T19:31:30Zhttp://cds.cern.ch/record/2064962engBalestri, ThomasElectroweak bosons in Pb+Pb and p+Pb collisions from ATLASNuclear Physics - ExperimentElectroweak boson ($W$, $Z$, $\gamma$) measurements in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV and in $p$+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV are presented with the ATLAS detector at the LHC. In Pb+Pb, electroweak boson yields are shown to be independent of centrality. Differential measurements in absolute pseudorapidity are used to investigate nuclear effects to the free-proton parton distribution function (PDF). The distributions lack the experimental precision to unambiguously identify the presence of nuclear modifications. In $p$+Pb, the $Z$ boson cross section is measured as a function of center-of-mass rapidity $y_{Z}^{*}$ and the momentum fraction of the lead-going parton (Bjorken $x_{Pb}$). The distributions are asymmetric and model predictions underestimate the data at large $x_{Pb}$. The overall shape is best described by including nuclear effects. The differential cross section is also measured in different centrality classes and shows evidence of spatially-dependent nuclear PDFs. The $Z$ boson production yields are measured as a function of the mean number of participants using Glauber and Glauber-Gribov color fluctuation models. Binary scaling of the yields is observed utilizing the standard Glauber model after applying a centrality-bias correction.Electroweak boson ($W$, $Z$, $\gamma$) measurements in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV and in $p$+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV are presented with the ATLAS detector at the LHC. In Pb+Pb, electroweak boson yields are shown to be independent of centrality. Differential measurements in absolute pseudorapidity are used to investigate nuclear effects to the free-proton parton distribution function (PDF). The distributions lack the experimental precision to unambiguously identify the presence of nuclear modifications. In $p$+Pb, the $Z$ boson cross section is measured as a function of center-of-mass rapidity $y_{Z}^{*}$ and the momentum fraction of the lead-going parton (Bjorken $x_{Pb}$). The distributions are asymmetric and model predictions underestimate the data at large $x_{Pb}$. The overall shape is best described by including nuclear effects. The differential cross section is also measured in different centrality classes and shows evidence of spatially-dependent nuclear PDFs. The $Z$ boson production yields are measured as a function of the mean number of participants using Glauber and Glauber-Gribov color fluctuation models. Binary scaling of the yields is observed utilizing the standard Glauber model after applying a centrality-bias correction.arXiv:1511.01142oai:cds.cern.ch:20649622015-11-03 |
spellingShingle | Nuclear Physics - Experiment Balestri, Thomas Electroweak bosons in Pb+Pb and p+Pb collisions from ATLAS |
title | Electroweak bosons in Pb+Pb and p+Pb collisions from ATLAS |
title_full | Electroweak bosons in Pb+Pb and p+Pb collisions from ATLAS |
title_fullStr | Electroweak bosons in Pb+Pb and p+Pb collisions from ATLAS |
title_full_unstemmed | Electroweak bosons in Pb+Pb and p+Pb collisions from ATLAS |
title_short | Electroweak bosons in Pb+Pb and p+Pb collisions from ATLAS |
title_sort | electroweak bosons in pb+pb and p+pb collisions from atlas |
topic | Nuclear Physics - Experiment |
url | http://cds.cern.ch/record/2064962 |
work_keys_str_mv | AT balestrithomas electroweakbosonsinpbpbandppbcollisionsfromatlas |