Forward-backward asymmetry in top quark-antiquark production

Abazov, Victor Mukhamedovich

doi:10.1103/PhysRevD.84.112005

Title: Forward-backward asymmetry in top quark-antiquark production

Journal Article · Mon Dec 12 04:00:00 UTC 2011 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI: https://doi.org/10.1103/PhysRevD.84.112005 · OSTI ID:1021499

Abazov, Victor Mukhamedovich ^[1]

et al.

We present a measurement of forward-backward asymmetry in top quark-antiquark production in proton-antiproton collisions in the final state containing a lepton and at least four jets. Using a dataset corresponding to an integrated luminosity of 5.4 fb^-1, collected by the D0 experiment at the Fermilab Tevatron Collider, we measure the t{bar t} forward-backward asymmetry to be (9.2 ± 3.7)% at the reconstruction level. When corrected for detector acceptance and resolution, the asymmetry is found to be (19.6 ± 6.5)%. We also measure a corrected asymmetry based on the lepton from a top quark decay, found to be (15.2 ± 4.0)%. The results are compared to predictions based on the next-to-leading-order QCD generator mc@nlo. The sensitivity of the measured and predicted asymmetries to the modeling of gluon radiation is discussed.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: D0 Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1021499

Report Number(s):: FERMILAB-PUB--11-347-E; arXiv eprint number arXiv:1107.4995

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Journal Issue: 11 Vol. 84; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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