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

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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 sqrt(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, ℓPCPC=−0.035±0.014(stat)±0.037(syst) and ℓPCPV=0.020±0.016(stat)+0.013−0.017(syst), are in good agreement with the standard model prediction of negligible top quark polarization.

Autore Pugliese

Tutti gli autori

  • G. AAD , M. BIANCO , G. CHIODINI , E. GORINI , M. PRIMAVERA , S. SPAGNOLO , A. VENTURA , ET AL.

Titolo volume/Rivista

PHYSICAL REVIEW LETTERS

Anno di pubblicazione

2013

ISSN

0031-9007

ISBN

Non Disponibile

Numero di citazioni Wos

29

Ultimo Aggiornamento Citazioni

28/04/2018

Numero di citazioni Scopus

28

Ultimo Aggiornamento Citazioni

28/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile