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T: Fachverband Teilchenphysik

T 79: Experimentelle Methoden II

T 79.8: Talk

Tuesday, March 29, 2011, 18:30–18:45, 30.23: 2-1

Study of the Electron Charge-Flip Process in ATLAS — •Patricia Sauer, Sebastian Schätzel, and André Schöning — Physikalisches Institut, Universität Heidelberg

Same-charge dileptons are a promising search channel for New Physics because Standard Model background is small. However, electrons can undergo a charge-flip process by radiating a hard Bremsstrahlung photon which subsequently converts asymmetrically, imparting most of its energy to a positron. In this way, most of the electron energy is transferred to a positron and an opposite-charge event–of which there are plenty in the Standard Model–is reconstructed as a same-charge event. We study the electron charge-flip using Z → ee events recorded in ATLAS and develop strategies to suppress this background.