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

Journal Article · · Physical Review D
 [1]
  1. Univ. of Helsinki, Helsinki (Finland); Helsinki Institute of Physics, Helsinki (Finland). et al.
+ Show Author Affiliations

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. A linear fit to AFBtt(|Δy|), assuming zero asymmetry at Δy=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 AFBtt(|Δy|) in the two final states is α=0.227±0.057, which is 2.0σ larger than the SM prediction.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
CDF Collaboration
Grant/Contract Number:
AC02-07CH11359; AC02-05CH11231
OSTI ID:
1253585
Alternate ID(s):
OSTI ID: 1255475; OSTI ID: 1454473
Report Number(s):
FERMILAB-PUB-16-045-E; arXiv:1602.09015; 1424841; TRN: US1601716
Journal Information:
Physical Review D, Vol. 93, Issue 11; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (5)

Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron journal January 2018
Soft-gluon corrections in top-quark production journal September 2018
Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron text January 2018
Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron text January 2018
Soft-gluon corrections in top-quark production text January 2018

Linked Research (2)

Figures / Tables (20)

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