logo cctval 2018 logo utfsm 2018

header area inv 2

area2 480

area2 320

Experimental High Energy Physics

Publications

Measurement of the top quark pair production charge asymmetry in proton-proton collisions at s√ = 7 TeV using the ATLAS detector

Publicaciones

Measurement of the top quark pair production charge asymmetry in proton-proton collisions at s√ = 7 TeV using the ATLAS detector

Research areas:

Física Experimental de Alta Energía

Year:

2014

Type of Publication:

In Proceeding

Authors:

Journal:

JHEP

Volume:

1402

Pages:

38

 

Abstract:

This paper presents a measurement of the top quark pair (tt¯) production charge asymmetry AC using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A tt¯ enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b–quark, is selected. A likelihood fit is used to reconstruct the tt¯ event kinematics. A Bayesian unfolding procedure is employed to estimate AC at the parton–level. The measured value of the tt¯ production charge asymmetry is AC = 0.006± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential AC measurements as a function of the invariant mass, the rapidity and the transverse momentum of the tt¯-system are also presented. In addition, AC is measured for a subset of events with large tt¯ velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.

[Volver]