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Física Experimental de Alta Energía

Publicaciones

Measurement of top quark polarization in top-antitop events from proton-proton collisions at s√ = 7 TeV using the ATLAS detector

Publicaciones

Measurement of top quark polarization in top-antitop events from proton-proton collisions at s√ = 7 TeV using the ATLAS detector

Research areas:

Física Experimental de Alta Energía

Year:

2013

Type of Publication:

In Proceeding

Authors:

Journal:

Phys. Rev. Lett

Volume:

111

Pages:

6

Abstract:

This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7  fb-1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at s=7  TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of αℓP, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving or a maximally CP violating production process. The measurements obtained, αℓPCPC=-0.035±0.014(stat)±0.037(syst) and αℓPCPV=0.020±0.016(stat)-0.017+0.013(syst), are in good agreement with the standard model prediction of negligible top quark polarization.

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