Spin correlation in ttbar production (D0)
Yvonne Peters · Proceedings of 36th International Conference on High Energy Physics — PoS(ICHEP2012) · 2013
The heaviest known elementary particle today, the top quark, has been discovered in 1995 by the CDF and D0 collaborations at the Tevatron collider at Fermilab.Its high mass and short lifetime, shorter than the timescale for hadronization, makes the top quark a special particle to study.Due to the short lifetime, the top quark's spin information is preserved in the decay products.In this article we discuss the studies of t t spin correlations at D0, testing the full chain from production to decay.In particular, we present a measurement using angular information and an analysis using a matrix-element based technique.The application of the matrix-element based technique to the t t dilepton and semileponic final state resulted in the first evidence for non-vanishing t t spin correlations.