Artigo
Forward-backward asymmetry in top quark-antiquark production
Fecha
2011-12-12Registro en:
Physical Review D. College Pk: Amer Physical Soc, v. 84, n. 11, p. 13, 2011.
1550-7998
10.1103/PhysRevD.84.112005
WOS:000297937500001
WOS000297937500001.pdf
Autor
Joint Inst Nucl Res
Univ Buenos Aires
Centro Brasileiro de Pesquisas Físicas (CBPF)
Univ Estado Rio de Janeiro
Universidade Federal do ABC (UFABC)
Universidade Estadual Paulista (Unesp)
Simon Fraser Univ
York Univ
Univ Sci & Technol China
Universidad de los Andes
Charles Univ Prague
Czech Tech Univ
Acad Sci Czech Republic
Univ San Francisco Quito
Univ Clermont Ferrand
Univ Grenoble 1
Aix Marseille Univ
Univ Paris 11
Univ Paris 06
Univ Paris 07
CEA
Univ Strasbourg
Univ Lyon 1
Univ Lyon
RWTH Aachen University
Univ Freiburg
Univ Gottingen
Johannes Gutenberg Univ Mainz
Univ Munich
Univ Wuppertal
Panjab Univ
University of Delhi
Tata Inst Fundamental Res
Univ Coll Dublin
Korea University
CINVESTAV
Nikhef
Radboud Univ Nijmegen
Institute for Theoretical and Experimental Physics (ITEP)
Moscow MV Lomonosov State Univ
Inst High Energy Phys
Petersburg Nucl Phys Inst
ICREA
IFAE
Uppsala Univ
Stockholm Univ
University of Lancaster
Univ London Imperial Coll Sci Technol & Med
University of Manchester
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University of California, Riverside (UCR)
Florida State University
Fermilab Natl Accelerator Lab
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Brookhaven Natl Lab
Langston Univ
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Resumen
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 data set corresponding to an integrated luminosity of 5.4 fb(-1), collected by the D0 experiment at the Fermilab Tevatron Collider, we measure the t (t) over bar 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.