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Search for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector

A search for Dark Matter (DM) is presented, exploiting final states containing a photon and missing transverse momentum, using 139 fb$^{-1}$ of data collected by the ATLAS experiment (LHC) at a centre-of-mass energy of 13 TeV. The discriminant variable is the missing transverse momentum (\met): seve...

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Autor principal: Piazza, Federica
Lenguaje:eng
Publicado: 2022
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.406.0098
http://cds.cern.ch/record/2857866
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author Piazza, Federica
author_facet Piazza, Federica
author_sort Piazza, Federica
collection CERN
description A search for Dark Matter (DM) is presented, exploiting final states containing a photon and missing transverse momentum, using 139 fb$^{-1}$ of data collected by the ATLAS experiment (LHC) at a centre-of-mass energy of 13 TeV. The discriminant variable is the missing transverse momentum (\met): several signal regions are defined in bins of \met\ to enhance the analysis sensitivity, and associated control regions (CRs) are built to derive background expectations by normalizing Monte Carlo (MC) yields to data through a likelihood fit simultaneously performed over all the CRs. This strategy allows combining inputs from all the CRs coherently, taking into account the correlations of systematic uncertainties among different regions. No deviations are observed relative to the predictions of the Standard Model and 95% confidence level (CL) upper limits between 2.4 fb and 0.5 fb are set on the visible cross section of physics beyond the Standard Model, in different ranges of \met. The results are interpreted as exclusion limits in simplified DM models, where weakly interacting DM candidates are pair-produced via an s-channel axial-vector or vector mediator. The search excludes mediator masses below 920-1470 GeV for DM candidate masses below 280-580 GeV at 95% CL, depending on the couplings. These results are translated into exclusion limits on the interaction cross-section between DM and nucleons as a function of the DM mass, and compared with the limits currently set by direct detection experiments, underlying a good complementarity between the two detection strategies. In addition, the results are expressed in terms of 95% CL limits on the parameters of a model with an axion-like particle produced in association with a photon.
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spelling cern-28578662023-05-05T18:57:08Zdoi:10.22323/1.406.0098http://cds.cern.ch/record/2857866engPiazza, FedericaSearch for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detectorParticle Physics - ExperimentA search for Dark Matter (DM) is presented, exploiting final states containing a photon and missing transverse momentum, using 139 fb$^{-1}$ of data collected by the ATLAS experiment (LHC) at a centre-of-mass energy of 13 TeV. The discriminant variable is the missing transverse momentum (\met): several signal regions are defined in bins of \met\ to enhance the analysis sensitivity, and associated control regions (CRs) are built to derive background expectations by normalizing Monte Carlo (MC) yields to data through a likelihood fit simultaneously performed over all the CRs. This strategy allows combining inputs from all the CRs coherently, taking into account the correlations of systematic uncertainties among different regions. No deviations are observed relative to the predictions of the Standard Model and 95% confidence level (CL) upper limits between 2.4 fb and 0.5 fb are set on the visible cross section of physics beyond the Standard Model, in different ranges of \met. The results are interpreted as exclusion limits in simplified DM models, where weakly interacting DM candidates are pair-produced via an s-channel axial-vector or vector mediator. The search excludes mediator masses below 920-1470 GeV for DM candidate masses below 280-580 GeV at 95% CL, depending on the couplings. These results are translated into exclusion limits on the interaction cross-section between DM and nucleons as a function of the DM mass, and compared with the limits currently set by direct detection experiments, underlying a good complementarity between the two detection strategies. In addition, the results are expressed in terms of 95% CL limits on the parameters of a model with an axion-like particle produced in association with a photon.oai:cds.cern.ch:28578662022
spellingShingle Particle Physics - Experiment
Piazza, Federica
Search for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector
title Search for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector
title_full Search for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector
title_fullStr Search for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector
title_full_unstemmed Search for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector
title_short Search for Dark Matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector
title_sort search for dark matter in association with an energetic photon in $pp$ collisions at $\sqrt s = 13$ tev with the atlas detector
topic Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.406.0098
http://cds.cern.ch/record/2857866
work_keys_str_mv AT piazzafederica searchfordarkmatterinassociationwithanenergeticphotoninppcollisionsatsqrts13tevwiththeatlasdetector