@misc{10481/58026,
year = {2019},
month = {3},
url = {http://hdl.handle.net/10481/58026},
abstract = {The efficiency of the photon identification criteria
in the ATLAS detector is measured using 36.1 fb1 to
36.7 fb1 of pp collision data at
√
s = 13 TeV collected in
2015 and 2016. The efficiencies are measured separately for
converted and unconverted isolated photons, in four different
pseudorapidity regions, for transverse momenta between
10 GeV and 1.5 TeV. The results from the combination of
three data-driven techniques are compared with the predictions
from simulation after correcting the variables describing
the shape of electromagnetic showers in simulation for
the average differences observed relative to data. Data-tosimulation
efficiency ratios are determined to account for
the small residual efficiency differences. These factors are
measured with uncertainties between 0.5% and 5% depending
on the photon transverse momentum and pseudorapidity.
The impact of the isolation criteria on the photon identification
efficiency, and that of additional soft pp interactions, are
also discussed. The probability of reconstructing an electron
as a photon candidate ismeasured in data, and compared with
the predictions from simulation. The efficiency of the reconstruction
of photon conversions is measured using a sample
of photon candidates from Z → μμγ events, exploiting the
properties of the ratio of the energies deposited in the first
and second longitudinal layers of the ATLAS electromagnetic
calorimeter.},
organization = {We thank CERN for the very successful operation
of the LHC, as well as the support staff from our institutions
without whom ATLAS could not be operated efficiently. We acknowledge
the support of ANPCyT, Argentina; YerPhI, Armenia; ARC,
Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC,
Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada;
CERN; CONICYT, Chile; CAS,MOST and NSFC, China; COLCIENCIAS,
Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic;
DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU,
France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT,
Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center,
Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO,
The Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT,
Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian
Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and
MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and
Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, UK;
DOE and NSF, USA. In addition, individual groups and members have
received support fromBCKDF,CANARIE,CRCandComputeCanada,
Canada; COST, ERC, ERDF, Horizon 2020, and Marie Skłodowska-
Curie Actions, European Union; Investissements d’ Avenir Labex and
Idex, ANR, France; DFG and AvH Foundation, Germany; Herakleitos,
Thales and Aristeia programmes co-financed by EU-ESF and the Greek
NSRF,Greece; BSF-NSF and GIF, Israel;CERCAProgramme Generalitat
de Catalunya, Spain; The Royal Society and Leverhulme Trust, UK.
The crucial computing support from all WLCG partners is acknowledged
gratefully, in particular from CERN, the ATLAS Tier-1 facilities
at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CCIN2P3
(France), KIT/GridKA (Germany), INFN-CNAF (Italy), NLT1
(The Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and
BNL (USA), the Tier-2 facilities worldwide and large non-WLCG
resource providers.},
publisher = {Springer},
title = {Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run 2 data collected in 2015 and 2016},
doi = {10.1140/epjc/s10052-019-6650-6},
author = {Aaboud, M. and Aguilar Saavedra, Juan Antonio and Atlas Collaboration},
}