# Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at $\sqrt{s}=7$TeV using the ATLAS detector

Abstract : A measurement of the correlations between the polar angles of leptons from the decay of pair-produced $t$ and $\bar{t}$ quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6fb$^{-1}$ at a center-of-mass energy of $\sqrt{s}=7$TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles $\theta_1$ and $\theta_2$ between the charged leptons and the direction of motion of the parent quarks in the $t\bar{t}$ rest frame are sensitive to the spin information, and the distribution of {\mbox{$\cos\theta_1\cdot\cos\theta_2$}} is sensitive to the spin correlation between the $t$ and $\bar{t}$ quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.
Type de document :
Article dans une revue
Physical Review D, American Physical Society, 2016, 93, pp.012002 〈10.1103/PhysRevD.93.012002〉
Liste complète des métadonnées

http://hal.in2p3.fr/in2p3-01220806
Contributeur : Emmanuelle Vernay <>
Soumis le : mardi 27 octobre 2015 - 07:54:48
Dernière modification le : mardi 13 février 2018 - 13:28:06

### Citation

G. Aad, S. Albrand, J. Collot, S. Crépé-Renaudin, P.A. Delsart, et al.. Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at $\sqrt{s}=7$TeV using the ATLAS detector. Physical Review D, American Physical Society, 2016, 93, pp.012002 〈10.1103/PhysRevD.93.012002〉. 〈in2p3-01220806〉

### Métriques

Consultations de la notice