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Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data

2016-12-03Journal article Open access
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dc.contributor.authorATLAS collaboration (2856 authors)
dc.contributor.authorAguilar-Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAnjos, Nuno
dc.contributor.authorAraque, Juan Pedro
dc.contributor.authorCantrill, Robert
dc.contributor.authorCarvalho, João
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muiño, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGonçalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorLopes, Lourenco
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amélia
dc.contributor.authorManeira, José
dc.contributor.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, António
dc.contributor.authorPalma, Alberto
dc.contributor.authorPedro, Rute
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, João
dc.contributor.authorSilva, José
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-04T10:12:16Z
dc.date.available2019-02-04T10:12:16Z
dc.date.issued2016-12-03
dc.date.updated2019-02-04T10:12:15Z
dc.description.abstractThe algorithms used by the ATLAS Collaboration to reconstruct and identify prompt photons are described. Measurements of the photon identification efficiencies are reported, using 4.9 fb$^{-1}$ of pp collision data collected at the LHC at $\sqrt{s} = 7$   $\text {TeV}$ and 20.3 fb$^{-1}$ at $\sqrt{s} = 8$   $\text {TeV}$ . The efficiencies are measured separately for converted and unconverted photons, in four different pseudorapidity regions, for transverse momenta between 10  $\text {GeV}$ and 1.5  $\text {TeV}$ . The results from the combination of three data-driven techniques are compared to the predictions from a simulation of the detector response, after correcting the electromagnetic shower momenta in the simulation for the average differences observed with respect to data. Data-to-simulation efficiency ratios used as correction factors in physics measurements are determined to account for the small residual efficiency differences. These factors are measured with uncertainties between 0.5% and 10% in 7  $\text {TeV}$ data and between 0.5% and 5.6% in 8  $\text {TeV}$ data, depending on the photon transverse momentum and pseudorapidity.
dc.description.versionPeer Reviewed
dc.identifierEur.Phys.J. C76 (2016) 666; DOI 10.1140/epjc/s10052-016-4507-9
dc.identifier.urihttp://dx.doi.org/10.1140/epjc/s10052-016-4507-9
dc.identifier.urihttp://hdl.handle.net/10400.26/27102
dc.language.isoeng
dc.titleMeasurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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