Introduction

Electron reconstruction in ATLAS combines the information from the Inner detector and the electromagnetic calorimeter. The electron identification and trigger efficiencies are crucial for benchmark processes W,Z in early data.

The Tag-and-Probe Method

Comments on the InsituPerformance framework.

Selection Criteria

Cuts.png

Fit Signal and Background

Extended Maximum Likelihood (EML) :

SignalPdf.png

Breit-Wigner: $$BW(M_Z, \Gamma_Z; M_{ee}) = \frac{\Gamma_Z}{2\pi} \frac{1}{(M_{ee} - M_Z)^2 + \Gamma_Z^2}$$

Approximate parton luminosity term: $$( \frac{M_Z}{M_{ee}} )^\beta$$

Crystal Ball: $$A$$

Datasets

Datasets.png

Results

Systematics

ATLAS: HongboZhu/ElectronID (last edited 2010-06-07 13:25:27 by HongboZhu)