Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-07-09
Phys.Rev.Lett. 87 (2001) 242002
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.87.242002
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.
Bernreuther Werner
Brandenburg Axel
Si Zong-Guo
Uwer Peter
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