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Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 65: Top: Spin, Winkelverteilungen, Asymmetrie, Breite

T 65.6: Talk

Wednesday, March 11, 2015, 18:00–18:15, L.10.31 (HS 10)

Measurement of the charge asymmetry in dileptonic tt events at s=7 TeV using the ATLAS detectorSara Borroni1, Nello Bruscino2, Markus Cristinziani2, Frédéric Déliot3, Cécile Deterre1, Mazuza Ghneimat2, Sebastian Heer2, Vadim Kostyukhin2, Roman Lysák4, Evan Machefer2, •Liza Mijović2,3, Reinhild Yvonne Peters5, Ralf Schäfer1, and Kaven Yau Wong21DESY, Hamburg — 2Physikalisches Institut, Universität Bonn — 3CEA, Saclay — 4Acad. of Sciences of the Czech Rep. — 5University of Manchester

A measurement of the top-antitop (tt) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb−1 of LHC pp collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and missing transverse momentum are selected. Two charge asymmetry observables are studied, based on the identified charged leptons, ACℓℓ, or on the reconstructed tt final state, ACtt. The asymmetries are measured to be:

ACℓℓ=0.024 ± 0.015  (stat.) ± 0.009  (syst.),
ACtt=0.021 ± 0.025  (stat.) ± 0.017  (syst.).

The measured values are in agreement with the Standard Model predictions.

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