Aaltonen, T;
Amerio, S;
Amidei, D;
Anastassov, A;
Annovi, A;
Antos, J;
Apollinari, G;
... Zucchelli, S; + view all
(2016)
Measurement of the forward-backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set.
Physical Review D
, 93
(11)
, Article 112005. 10.1103/PhysRevD.93.112005.
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Abstract
We measure the forward–backward asymmetry of the production of top-quark and antiquark pairs in proton-antiproton collisions at center-of-mass energy √ s = 1.96 TeV using the full data set collected by the Collider Detector at Fermilab (CDF) in Tevatron Run II corresponding to an integrated luminosity of 9.1 fb − 1 . The asymmetry is characterized by the rapidity difference between top quarks and antiquarks ( Δ y ) and measured in the final state with two charged leptons (electrons and muons). The inclusive asymmetry, corrected to the entire phase space at parton level, is measured to be A t ¯ t FB = 0.12 ± 0.13 , consistent with the expectations from the standard model (SM) and previous CDF results in the final state with a single charged lepton. The combination of the CDF measurements of the inclusive A t ¯ t FB in both final states yields A t ¯ t FB = 0.160 ± 0.045 , which is consistent with the SM predictions. We also measure the differential asymmetry as a function of Δ y . A linear fit to A t ¯ t FB ( | Δ y | ) , assuming zero asymmetry at Δ y = 0 , yields a slope of α = 0.14 ± 0.15 , consistent with the SM prediction and the previous CDF determination in the final state with a single charged lepton. The combined slope of A t ¯ t FB ( | Δ y | ) in the two final states is α = 0.227 ± 0.057 , which is 2.0 σ larger than the SM prediction.
| Type: | Article |
|---|---|
| Title: | Measurement of the forward-backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.93.112005 |
| Publisher version: | http://doi.org/10.1103/PhysRevD.93.112005 |
| Language: | English |
| Additional information: | © 2016 American Physical Society. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, PROTON-PROTON COLLISIONS, CHARGE ASYMMETRY, ROOT-S=7 TEV, ATLAS DETECTOR, STATE |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1501555 |
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