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Measurement of top quark polarization in t¯t lepton+jets final states
D0 Collaboration
D0 Collaboration
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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.
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2017-01-09
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American Physical Society
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D0Collaboration_2017.pdf
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Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., ... & Atkins, S. (2017). Measurement of top quark polarization in t¯ t lepton+ jets final states. Physical Review D, 95(1), 011101.