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Measurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector
ATLAS measurements of dimuons produced via $\gamma\gamma$ scattering processes in inelastic, non-ultra-peripheral Pb+Pb collisions at 5.02 TeV are presented using an integrated luminosity of 1.9 nb$^{−1}$. The $\gamma\gamma\rightarrow\mu^+\mu^-$ pairs are identified via selections on pair momentum a...
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Lenguaje: | eng |
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2020
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Acceso en línea: | http://cds.cern.ch/record/2720114 |
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author | Gilbert, Benjamin Jacob |
author_facet | Gilbert, Benjamin Jacob |
author_sort | Gilbert, Benjamin Jacob |
collection | CERN |
description | ATLAS measurements of dimuons produced via $\gamma\gamma$ scattering processes in inelastic, non-ultra-peripheral Pb+Pb collisions at 5.02 TeV are presented using an integrated luminosity of 1.9 nb$^{−1}$. The $\gamma\gamma\rightarrow\mu^+\mu^-$ pairs are identified via selections on pair momentum asymmetry and acoplanarity, and the contribution from the heavy flavor decay background is estimated using a template fit method. The pair yields are measured differentially as functions of the centrality, average transverse-momentum ($p_T$) and rapidity of the pair. The measurement shows a depletion in the number of muon pairs near zero acoplanarity in central events, resulting in the distributions peaking at non-zero values of acoplanarity. Fits to the perpendicular transverse momentum ($k_{\perp}$) distributions are used to estimate the centrality dependence of this peak position. The most probable is shown to increase from the most peripheral to the most central collisions, reaching a value of $k_{\perp}$=36$\pm$1 MeV in the 0-5$\%$ most-central collisions. The ability of these measurements to qualitatively differentiate between different physical origins of the observed centrality and $p_T$ dependence are discussed |
id | cern-2720114 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2020 |
record_format | invenio |
spelling | cern-27201142020-06-08T19:16:10Zhttp://cds.cern.ch/record/2720114engGilbert, Benjamin JacobMeasurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS DetectorParticle Physics - ExperimentATLAS measurements of dimuons produced via $\gamma\gamma$ scattering processes in inelastic, non-ultra-peripheral Pb+Pb collisions at 5.02 TeV are presented using an integrated luminosity of 1.9 nb$^{−1}$. The $\gamma\gamma\rightarrow\mu^+\mu^-$ pairs are identified via selections on pair momentum asymmetry and acoplanarity, and the contribution from the heavy flavor decay background is estimated using a template fit method. The pair yields are measured differentially as functions of the centrality, average transverse-momentum ($p_T$) and rapidity of the pair. The measurement shows a depletion in the number of muon pairs near zero acoplanarity in central events, resulting in the distributions peaking at non-zero values of acoplanarity. Fits to the perpendicular transverse momentum ($k_{\perp}$) distributions are used to estimate the centrality dependence of this peak position. The most probable is shown to increase from the most peripheral to the most central collisions, reaching a value of $k_{\perp}$=36$\pm$1 MeV in the 0-5$\%$ most-central collisions. The ability of these measurements to qualitatively differentiate between different physical origins of the observed centrality and $p_T$ dependence are discussedATL-PHYS-SLIDE-2020-176oai:cds.cern.ch:27201142020-06-08 |
spellingShingle | Particle Physics - Experiment Gilbert, Benjamin Jacob Measurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector |
title | Measurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector |
title_full | Measurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector |
title_fullStr | Measurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector |
title_full_unstemmed | Measurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector |
title_short | Measurement of Non-Exclusive Dimuon Pairs Produced via $\gamma\gamma$ Scattering in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector |
title_sort | measurement of non-exclusive dimuon pairs produced via $\gamma\gamma$ scattering in pb+pb collisions at $\sqrt{s_{nn}}$ = 5.02 tev with the atlas detector |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/2720114 |
work_keys_str_mv | AT gilbertbenjaminjacob measurementofnonexclusivedimuonpairsproducedviagammagammascatteringinpbpbcollisionsatsqrtsnn502tevwiththeatlasdetector |