Leipzig 2002 – wissenschaftliches Programm
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T: Teilchenphysik
T 105: Schwere Quarks I
T 105.8: Vortrag
Montag, 18. März 2002, 15:45–16:00, HS 6
Top-Quark Pair Production and Decay Including Spin Effects at Hadron Colliders: Predictions at NLO QCD — •Zongguo Si1, Werner Bernreuther1, Arnd Brandenburg2, and Peter Uwer3 — 1Inst. f. Theoretische Physik, RWTH Aachen — 2DESY-Theorie, Hamburg — 3Inst. f. Theor. Teilchenphysik, Univ. Karlsruhe
Top quark-antiquark (tt) pairs will be produced copiously at the Tevatron collider and in huge numbers at the LHC. This will make possible detailed investigations of the properties and interactions of this quark flavor. The analysis and interpretation of future data requires precise predictions of the hadronic production of tt pairs and of their subsequent decays. In this talk the reactions p p, p p → tt + X → ℓ+ ℓ′− + X are considered and results are presented of our calculation of the dilepton angular distribution at next-to-leading order (NLO) QCD, keeping the full dependence on the spins of the intermediate tt state. The angular distribution is determined for different choices of reference axes that can be identified with the t and t spin axes. While the QCD corrections to the leading-order distribution turn out to be small in the case of the LHC, we find them to be sizeable in the case of the Tevatron and, moreover, the angular distribution is sensitive to the parton content of the proton.