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

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. D 95, 011101(R) – Published 9 January 2017

Abstract

We present a measurement of top quark polarization in tt¯ pair production in pp¯ collisions at s=1.96TeV using data corresponding to 9.7fb1 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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  • Received 27 July 2016

DOI:https://doi.org/10.1103/PhysRevD.95.011101

© 2017 American Physical Society

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Particles & Fields

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Vol. 95, Iss. 1 — 1 January 2017

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