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

Abazov, V. M. and Abbott, B. and Acharya, B. S. and Adams, M. and Agnew, J. P. and Alexeev, G. D. and Alkhazov, G. and Alton, A. and Askew, A. and Atkins, S. and Augsten, K. and Aushev, V. and Aushev, Y. and Avila, C. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D. V. and Barberis, E. and Baringer, P. and Bartlett, J. F. and Bassler, U. and Bazterra, V. and Begalli, M. and Bellantoni, L. and Bernardi, G. and Bernhard, R. and Bertram, I. and Besanifmmode çelse çon, M. and Beuselinck, R. and Bhat, P. C. and Bhatia, S. and Bhatnagar, V. and Blazey, G. and Blessing, S. and Bloom, K. and Boehnlein, A. and Boline, D. and Boos, E. E. and Borissov, G. and Borysova, M. and Brandt, A. and Brandt, O. and Brochmann, M. and Brock, R. and Bross, A. and Bu, X. B. and Price, D. and Ratoff, P. N. and Williams, M. R. J. (2017) Measurement of top quark polarization in $tt$ $lepton+jets$ final states. Physical Review D, 95 (1). ISSN 1550-7998

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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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Journal Article
Journal or Publication Title:
Physical Review D
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Deposited On:
20 Dec 2017 13:52
Last Modified:
30 Sep 2020 01:56