Measurement of top quark polarization in top-antitop events from proton-proton collisions at âs=7 TeV using the ATLAS detector.
Phys Rev Lett
; 111(23): 232002, 2013 Dec 06.
Article
in En
| MEDLINE
| ID: mdl-24476258
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 âs=7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of α(â)P, 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, α(â)P(CPC)=-0.035±0.014(stat)±0.037(syst) and α(â)P(CPV)=0.020±0.016(stat)(-0.017)(+0.013)(syst), are in good agreement with the standard model prediction of negligible top quark polarization.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Journal:
Phys Rev Lett
Year:
2013
Document type:
Article
Affiliation country:
Alemania