Electroweak Sudakov Corrections and the Top Quark Forward-Backward Asymmetry

Details Electroweak Sudakov Corrections and the Top Quark Forward-Backward Asymmetry Electroweak Sudakov Corrections and the Top Quark Forward-Backward Asymmetry

2012-01-18

arxiv.org/abs/1201.3926v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures

Scientific paper

The Standard Model (SM) prediction of the top quark forward backward asymmetry is shown to be slightly enhanced by a correction factor of 1.05 due to electroweak Sudakov (EWS) logarithms of the form (\alpha/sin^2 \theta_W)^n log^{m< 2n} (s/M_{W,Z}^2). The EWS effect on the dijet and t \bar{t} invariant mass spectra is significant, reducing the SM prediction by ~20, 10 % respectively for the highest invariant masses measured at the LHC, and changing the shape of the high-mass tail of the spectrum. These corrections significantly affect measurements of the top quark invariant mass spectrum and the search for an excess of events related to the top quark forward-backward asymmetry.

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