Publication: Measurement of top quark polarization in tt¯ lepton+jets final states
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We present a measurement of top quark polarization in tt- pair production in pp- collisions at 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 tt- production. The observed distributions are consistent with standard model predictions of nearly no polarization.
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English
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Physical Review D, v. 95, n. 1, 2017.
