Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at √s=7TeV using the ATLAS detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at √s=7TeV using the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, D93(1), 012002. American Physical Society 10.1103/PhysRevD.93.012002

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A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and 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 √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 θ₁ and θ₂ between the charged leptons and the direction of motion of the parent quarks in the tt rest frame are sensitive to the spin information, and the distribution of cosθ₁ ⋅cosθ₂ is sensitive to the spin correlation between the t and t quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.

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