Measurement of the forward–backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set

0501354 - FZÚ 2019 RIV US eng J - Journal Article
Aaltonen, T. - Amerio, S. - Amidei, D. - Lysák, Roman … Total 396 authors
Measurement of the forward–backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set.
Physical Review D. Roč. 93, č. 11 (2016), s. 1-17, č. článku 112005. ISSN 2470-0010. E-ISSN 2470-0029
Institutional support: RVO:68378271
Keywords : Batavia TEVATRON Coll * CDF * final state: ((n)jet dilepton) * slope * phase space
OECD category: Particles and field physics
Impact factor: 4.557, year: 2016

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 (Δy) 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 AFBtt¯=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 AFBtt¯ in both final states yields AFBtt¯=0.160±0.045, which is consistent with the SM predictions. We also measure the differential asymmetry as a function of Δy.
Permanent Link: http://hdl.handle.net/11104/0293342