Physical review / D 95(1), 011101 (2017). doi:10.1103/PhysRevD.95.011101
We present a measurement of top quark polarization in $t \overline{t}$ pair production in $p \overline{p}$ collisions at $\sqrt{s}$ = 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 tt¯ 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 $t \overline{t}$ production. The observed distributions are consistent with standard model predictions of nearly no polarization.
Published by Inst., Woodbury, NY