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Abazov, V. M.; Abbott, B.; Acharya, B. S.; Nunnemann, T. and Sanders, M. P. (2017): Measurement of top quark polarization in t(t)over-bar lepton+jets final states. In: Physical Review D, Vol. 95, No. 1, 11101

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We present a measurement of top quark polarization in t (t) over bar pair production in p (p) over bar collisions at root s = 1.96 TeV using data corresponding to 9.7 fb(-1) of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. We consider final states containing a lepton and at least three jets. The polarization is measured through the distribution of lepton angles along three axes: the beam axis, the helicity axis, and the transverse axis normal to the t (t) over bar production plane. This is the first measurement of top quark polarization at the Tevatron using lepton + jet final states and the first measurement of the transverse polarization in t (t) over bar production. The observed distributions are consistent with standard model predictions of nearly no polarization.

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