Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-10
Phys.Lett.B639:513-519,2006; Erratum-ibid.B660:607-609,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 4 figures, LaTeX, one figure corrected, some text changes, conclusions unchanged, version to appear in PLB, Erratum
Scientific paper
10.1016/j.physletb.2006.06.078 1
We calculate purely weak virtual one-loop corrections to the production cross section of top-antitop pairs at the Large Hadron Collider via the gluon-gluon fusion subprocess. We find very small negative corrections to the total cross section, of order -0.6%, but significantly larger effects to the differential one, particularly in the transverse momentum distribution, of order -5% to -10% (in observable regions). In case of parity-conserving spin-asymmetries of the final state, $\alpha_{\mathrm{S}}^2\alpha_{\mathrm{W}}$ corrections are typically of a few negative percent, with the exception of positive and negative peaks at $+12%$ and -5%, respectively (near where the tree-level predictions change sign), while those arising in parity-violating asymmetries (which are identically zero in QCD) are typically at a level of a few permille.
Moretti Sébastien
Nolten M. R.
Ross David A.
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