Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 44: Bottom-Produktion II

T 44.9: Talk

Thursday, March 31, 2011, 18:45–19:00, 30.22: 022

ATLAS inclusive electron spectrum measurement — •Tuan Vu Anh — Johannes Gutenberg-Universitaet Mainz

In ATLAS four sources of electron candidates are generally present in any physics process containing electron(s) in the event final state: light hadrons, mostly charged pions π^±, satisfying the experimental definition of electron object, electrons from photon conversions in the tracker volume, the photons themselves being dominantly produced in neutral pions π⁰ decays, non-isolated electrons in semi-leptonic decays of the charm and beauty hadrons, and isolated electrons from J/ψ, W^±, Z resonances, etc. Understanding each of these sources is crucial to electron signature physics studies such as the electroweak bosons production or supersymmetry searches. Limited to the low energy region, it leads to a quantitative comparison with the theory of the charm and beauty hadrons production. We will describe here novel statistical techniques to extract the electron sources and present results based on the first LHC collisions data at 7 TeV in the center of mass collected by the ATLAS experiment.