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Measurement of top quark polarization in $tt$ $lepton+jets$ final states

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  • D0 Collaboration
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Article number011101
<mark>Journal publication date</mark>9/01/2017
<mark>Journal</mark>Physical Review D
Issue number1
Volume95
Number of pages9
StatePublished
Original languageEnglish

Abstract

We present a measurement of top quark polarization in
t
¯
t
pair production in
p
¯
p
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
t
¯
t
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
production. The observed distributions are consistent with standard model predictions of nearly no polarization.