Top quark spin correlations at hadron colliders: Predictions at next-to-leading order QCD
| Autor: | A. Brandenburg, Z.G. Si, Werner Bernreuther, Peter Uwer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Particle physics
Top quark inclusive reaction [anti-p p] Hadron Tevatron General Physics and Astronomy FOS: Physical sciences Parton pair production [top] law.invention Nuclear physics High Energy Physics - Phenomenology (hep-ph) correlation [spin] law quantum chromodynamics dilepton [angular distribution] ddc:550 14000 GeV-cms [2000] Batavia TEVATRON Coll Collider numerical calculations Nuclear Experiment Spin-½ Quantum chromodynamics Physics Large Hadron Collider High Energy Physics::Phenomenology higher-order [perturbation theory] High Energy Physics - Phenomenology CERN LHC Coll semileptonic decay [top] High Energy Physics::Experiment inclusive reaction [p p] |
| Zdroj: | Physical review letters 87(24), 242002 (2001). doi:10.1103/PhysRevLett.87.242002 |
| DOI: | 10.1103/PhysRevLett.87.242002 |
| Popis: | The collider experiments at the Tevatron and the LHC will allow for detailed investigations of the properties of the top quark. This requires precise predictions of the hadronic production of $t\bar t$ pairs and of their subsequent decays. In this Letter we present for the reactions $p {\bar p}, p p \to t{\bar t} + X \to \ell^+\ell'^-X$ the first calculation of the dilepton angular distribution at next-to-leading order (NLO) in the QCD coupling, keeping the full dependence on the spins of the intermediate $t\bar{t}$ state. The angular distribution reflects the degree of correlation of the $t$ and $\bar t$ spins which we determine for different choices of $t$ and $\bar t$ spin bases. In the case of the Tevatron, the QCD corrections are sizeable, and the distribution is quite sensitive to the parton content of the proton. 9 pages, 2 figures |
| Databáze: | OpenAIRE |
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