Weak corrections to gluon-induced top–antitop hadro-production
| Autor: | D.A. Ross, Stefano Moretti, M.R. Nolten |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Quantum chromodynamics
Physics Nuclear and High Energy Physics Particle physics Large Hadron Collider media_common.quotation_subject High Energy Physics::Phenomenology Hadron FOS: Physical sciences Observable Parity (physics) Asymmetry Gluon Nuclear physics High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Transverse momentum High Energy Physics::Experiment media_common |
| Zdroj: | Physics Letters B. 639:513-519 |
| ISSN: | 0370-2693 |
| Popis: | 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. Comment: 12 pages, 4 figures, LaTeX, one figure corrected, some text changes, conclusions unchanged, version to appear in PLB, Erratum added |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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