Top quark spin correlations at hadron colliders: Predictions at next-to-leading order QCD

Bernreuther, W.; Si, Z. G.; Brandenburg, A.; Uwer, P.

doi:10.1103/PhysRevLett.87.242002

Report/Journal Article

PUBDB-2017-02267

Top quark spin correlations at hadron colliders: Predictions at next-to-leading order QCD

Bernreuther, W. ; Brandenburg, A.DESY* ; Si, Z. G. ; Uwer, P.

2001
APS College Park, Md.

Physical review letters 87(24), 242002 (2001) [10.1103/PhysRevLett.87.242002]

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.87.242002 doi:10.3204/PUBDB-2017-02267

Report No.: DESY-01-085; PITHA-01-06; TTP-01-16; hep-ph/0107086

Abstract: 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.

Keyword(s): anti-p p: inclusive reaction ; p p: inclusive reaction ; top: pair production ; top: semileptonic decay ; quantum chromodynamics ; perturbation theory: higher-order ; angular distribution: dilepton ; spin: correlation ; numerical calculations ; Batavia TEVATRON Coll ; CERN LHC Coll ; 2000: 14000 GeV-cms