Measurement of the Forward-Backward Asymmetry in Top-Antitop Quark Events in the Lepton+Jets Channel at D0

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 2012

DOI:https://doi.org/10.2172/1247706· OSTI ID:1247706

Orbaker, Douglas Andrew ^[1]

---

1. Univ. of Rochester, NY (United States)

We present a measurement of forward-backward asymmetries in top-antitop quark pairs produced in proton-antiproton collisions decaying via the lepton+jets channel. Using data recorded by the D0 experiment at the Fermilab Tevatron collider and corresponding to an integrated luminosity of 5.4 fb^-1, we measure the forward-backward asymmetry in top-antitop quark events to be $$\left(9.2 \pm 3.7\right)\%$$, after background processes have been subtracted. After correcting for the effects of acceptance and detector reconstruction, we measure an asymmetry of $$\left(19.6 \pm 6.5\right)\%$$. In addition, we measure an acceptance-corrected asymmetry based on the lepton from top-antitop quark decay of $$\left(15.2 \pm 4.0\right)\%$$. We compare these results to predictions from the MC@NLO next-to-leading-order QCD simulation.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1247706
• Report Number(s): FERMILAB-THESIS--2012-08; 1117757
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS