engleski

Electron reconstruction: e Classes, E scale Corrections and E-p combination

The reconstruction of the four-momentum of electrons in CMS combining tracking and electromagnetic calorimetry information is described.Electrons in the energy range from 5 to 100 GeV are considered. Different electron topologies, depending on the amount of bremsstrahlung and re-interaction in the inner tracker material, are identified to select the most adapted energy scale correction for the electron supercluster and to estimate the associated error. The electron tracks are built starting from a cluster-driven seed finding in the pixel detector, followed by a Gaussian Sum Filter technique to build and fit trajectories in the Silicon Tracker Detectors. The electron four-momentum is deduced from a combination of the supercluster energy and tracker momentum measurements, with the direction taken from the electron track at interaction vertex.

electron reconstruction; CMS; corrections

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