Skip to Main content Skip to Navigation
Journal articles

Electron reconstruction in CMS

Abstract : The reconstruction of the energy and momentum of isolated electrons in CMS combining tracking and electromagnetic calorimetry information is described. The emphasis is put on primary electrons with transverse momentum below 50 GeV/c. The energy deposited in the electromagnetic calorimeter is measured in clusters of clusters (superclusters) which collect bremsstrahlung photons emitted along the electron trajectory in the tracker volume. The electron tracks are built from seeds in the pixel detector found via a cluster-driven pixel hit matching algorithm, followed by a reconstruction of trajectories in the silicon strip tracker with a Gaussian sum filter. Electrons are classified using observables sensitive to the pattern of bremsstrahlung emission and electromagnetic showering in the tracker material. Energy scale corrections depending on the electron class are applied to the supercluster and estimates of associated errors are obtained. The electron energy is deduced from a weighted combination of the corrected supercluster energy and tracker momentum measurements. The electron direction is that of the reconstructed electron track at interaction vertex. The pre-selection of isolated electron candidates for physics analysis is described. Class-dependent observables combining tracking and calorimetry information are discussed for electron identification.
keyword : PRS
Document type :
Journal articles
Complete list of metadata

Cited literature [6 references]  Display  Hide  Download

http://hal.in2p3.fr/in2p3-00140484
Contributor : Dominique Girod <>
Submitted on : Friday, April 6, 2007 - 1:47:28 PM
Last modification on : Monday, November 16, 2020 - 3:14:10 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 11:43:30 PM

File

NOTE2006_040.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

S. Baffioni, C. Charlot, F. Ferri, D. Futyan, P. Meridiani, et al.. Electron reconstruction in CMS. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2007, 49, pp.1099-1016. ⟨10.1140/epjc/s10052-006-0175-5⟩. ⟨in2p3-00140484⟩

Share

Metrics

Record views

424

Files downloads

934