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Measurements of multi-parton interactions at ATLAS

Measurements of multiple parton scattering in proton-proton collisions provide insight into the structure and long-range low-momentum scale interactions of the proton. In this talk we present two recent measurements using proton-proton collision data collected by the ATLAS experiment. The first meas...

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Autor principal: Zenis, Tibor
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:http://cds.cern.ch/record/2689942
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author Zenis, Tibor
author_facet Zenis, Tibor
author_sort Zenis, Tibor
collection CERN
description Measurements of multiple parton scattering in proton-proton collisions provide insight into the structure and long-range low-momentum scale interactions of the proton. In this talk we present two recent measurements using proton-proton collision data collected by the ATLAS experiment. The first measurement determines the double-parton scattering contribution to four-lepton events at √s=8 TeV. An artificial neural net is used to optimise the analysis and an upper limit on the double-parton scattering fraction is set at 0.042, which corresponds to an effective cross section of 1mb. In the second measurement, the underlying event activity is studied in events containing a Z-boson in √s=13 TeV data. Unfolded differential cross sections are presented for charged particle multiplicity and charged particle transverse momentum in regions of azimuth measured with respect to the Z-boson direction. The data are compared to a wide variety of predictions from Monte Carlo event generators.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
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spelling cern-26899422019-09-30T06:29:59Zhttp://cds.cern.ch/record/2689942engZenis, TiborMeasurements of multi-parton interactions at ATLASParticle Physics - ExperimentMeasurements of multiple parton scattering in proton-proton collisions provide insight into the structure and long-range low-momentum scale interactions of the proton. In this talk we present two recent measurements using proton-proton collision data collected by the ATLAS experiment. The first measurement determines the double-parton scattering contribution to four-lepton events at √s=8 TeV. An artificial neural net is used to optimise the analysis and an upper limit on the double-parton scattering fraction is set at 0.042, which corresponds to an effective cross section of 1mb. In the second measurement, the underlying event activity is studied in events containing a Z-boson in √s=13 TeV data. Unfolded differential cross sections are presented for charged particle multiplicity and charged particle transverse momentum in regions of azimuth measured with respect to the Z-boson direction. The data are compared to a wide variety of predictions from Monte Carlo event generators.ATL-PHYS-SLIDE-2019-673oai:cds.cern.ch:26899422019-09-18
spellingShingle Particle Physics - Experiment
Zenis, Tibor
Measurements of multi-parton interactions at ATLAS
title Measurements of multi-parton interactions at ATLAS
title_full Measurements of multi-parton interactions at ATLAS
title_fullStr Measurements of multi-parton interactions at ATLAS
title_full_unstemmed Measurements of multi-parton interactions at ATLAS
title_short Measurements of multi-parton interactions at ATLAS
title_sort measurements of multi-parton interactions at atlas
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2689942
work_keys_str_mv AT zenistibor measurementsofmultipartoninteractionsatatlas