Abstract
An overview of the recent measurements of top quark charge, spin correlations, and top quark and W boson polarisation in tevents is presented. The measurements were performed at the Fermilab Tevatron collider in p ¯ p collision data at p s = 1:96 TeV by the CDF and D0 experiments and in pp collision data at p s = 7 TeV by the ATLAS and CMS experiments
Highlights
The existence of the top quark was required in the Standard Model (SM) as an isospin partner of the b-quark with its properties well defined expect for the mass
This technique relies on calculating a likelihood for each event based on the leading order (LO) matrix element (ME) for ttsignal which depends on the W helicity fractions and the dominant W+jets
In the template method W helicity fractions are extracted from the binned Poisson likelihood fit to data of the sum of background and right-handed, left-handed, and longitudinal helicity templates for the signal
Summary
The existence of the top quark was required in the Standard Model (SM) as an isospin partner of the b-quark with its properties well defined expect for the mass. The LHC with its high rate of top pair production provides a unique opportunity to perform precision measurements of the top quark production and decay properties. The dilepton and single lepton channels are typically used to study top quark properties due to their clean signatures and manageable backgrounds. The dilepton ttsignal is characterized by two high-pT isolated charged leptons, missing transverse momentum corresponding to the undetected neutrinos from the two leptonically decaying W bosons, and two b-jets. Due to the small backgrounds dominated by the Z+jets and diboson production this channel offers an opportunity to study top quark properties without a b-tagged jet requirement to avoid the associated systematic uncertainty
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