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Title: Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV

Abstract

A description is provided of the performance of the CMS detector for photon reconstruction and identification in proton-proton collisions at a centre-of-mass energy of 8 TeV at the CERN LHC. Details are given on the reconstruction of photons from energy deposits in the electromagnetic calorimeter (ECAL) and the extraction of photon energy estimates. Furthermore, the reconstruction of electron tracks from photons that convert to electrons in the CMS tracker is also described, as is the optimization of the photon energy reconstruction and its accurate modelling in simulation, in the analysis of the Higgs boson decay into two photons. In the barrel section of the ECAL, an energy resolution of about 1% is achieved for unconverted or late-converting photons from H → γγ decays. Furthermore, different photon identification methods are discussed and their corresponding selection efficiencies in data are compared with those found in simulated events.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1221259
Report Number(s):
FERMILAB-PUB-15-069-CMS; CERN-PH-EP-2015-006; CMS-EGM-14-001
Journal ID: ISSN 1748-0221; arXiv eprint number arXiv:1502.02702
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 10; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; pattern recognition; cluster finding; calibration and fitting methods; performance of high energy physics detectors

Citation Formats

Khachatryan, Vardan. Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV. United States: N. p., 2015. Web. doi:10.1088/1748-0221/10/08/P08010.
Khachatryan, Vardan. Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV. United States. https://doi.org/10.1088/1748-0221/10/08/P08010
Khachatryan, Vardan. Mon . "Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV". United States. https://doi.org/10.1088/1748-0221/10/08/P08010. https://www.osti.gov/servlets/purl/1221259.
@article{osti_1221259,
title = {Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV},
author = {Khachatryan, Vardan},
abstractNote = {A description is provided of the performance of the CMS detector for photon reconstruction and identification in proton-proton collisions at a centre-of-mass energy of 8 TeV at the CERN LHC. Details are given on the reconstruction of photons from energy deposits in the electromagnetic calorimeter (ECAL) and the extraction of photon energy estimates. Furthermore, the reconstruction of electron tracks from photons that convert to electrons in the CMS tracker is also described, as is the optimization of the photon energy reconstruction and its accurate modelling in simulation, in the analysis of the Higgs boson decay into two photons. In the barrel section of the ECAL, an energy resolution of about 1% is achieved for unconverted or late-converting photons from H → γγ decays. Furthermore, different photon identification methods are discussed and their corresponding selection efficiencies in data are compared with those found in simulated events.},
doi = {10.1088/1748-0221/10/08/P08010},
journal = {Journal of Instrumentation},
number = ,
volume = 10,
place = {United States},
year = {Mon Aug 10 00:00:00 EDT 2015},
month = {Mon Aug 10 00:00:00 EDT 2015}
}

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