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On the W+4 jets background to the top quark asymmetry at the Tevatron · Around

2012

On the W+4 jets background to the top quark asymmetry at the Tevatron

Hagiwara, Kaoru, Kanzaki, Junichi, Takaesu, Yoshitaro

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We investigate the possibility that the W+4 jets background is a source of the anomalously large top-antitop (t\={t}) charge asymmetry observed at the Tevatron.

We simulate the t\={t} reconstruction of the signal and background events at the matrix-element level and find that the reconstructed t\={t} candidates from the W +4 jets background could give large forward-backward asymmetry.
We suggest serious re-evaluation of the W+4 jets background for the t\={t} candidate events by studying the distributions of the reconstructed t\={t} systems in their rapidity difference, the transverse momentum of the top quark, and that of the t\={t} system, which can differ significantly from those of the QCD t\={t} production events especially at high t\={t} invariant mass.

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K. Hagiwara, J. Kanzaki, Q. Li, N. Okamura, T. Stelzer, in preparation

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