Photon Reconstruction and Identification with the ATLAS detector

Journal Article · Wed Feb 10 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3327706· OSTI ID:21371587

Donega, Mauro ^[1]

---

1. Department of Physics and Astronomy-University of Pennsylvania, Philadelphia (United States)

The understanding of the photons reconstruction will be one of the key issues at the start-up of data-taking with the ATLAS experiment at the LHC. Large statistics samples of photons produced in association with jets are expected over a wide range of E{sub T}.The photon reconstruction is based on an electromagnetic-cluster-seeded algorithm which classifies as photons those clusters which have no matching prompt track. These are then subdivided into converted or non-converted photon candidates depending on the presence of one or more tracker-reconstructed electron-positron pairs pointing to it. The precise knowledge of the material upstream the calorimeter and a correct treatment of the converted photons are critical for a correct photon reconstruction and identification.The photon identification is based almost entirely on the analysis of the shower shapes in the calorimeter. The goal is to achieve an efficient photon selection in the range from 20 GeV to several hundreds GeV with a rejection of 10{sup 3}-10{sup 4} against QCD jets in the moderate transverse momentum region of 20 to 100 GeV, which is the relevant one for H->gammagamma searches.

• OSTI ID: 21371587
• Journal Information: AIP Conference Proceedings, Vol. 1200, Issue 1; Conference: SUSY09: 17. international conference on supersymmetry and the unification of fundamental interactions, Boston, MA (United States), 5-10 Jun 2009; Other Information: DOI: 10.1063/1.3327706; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGORITHMS
CERN LHC
ELECTRONS
GAMMA DETECTION
GEV RANGE
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE TRACKS
PHOTONS
POSITRONS
SHOWER COUNTERS
TRANSVERSE ENERGY
TRANSVERSE MOMENTUM
ACCELERATORS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
CYCLIC ACCELERATORS
DETECTION
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
FERMIONS
KINETIC ENERGY
LEPTONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MATHEMATICAL LOGIC
MATTER
MEASURING INSTRUMENTS
RADIATION DETECTION
RADIATION DETECTORS
SPECTROMETERS
STORAGE RINGS
SYNCHROTRONS