パートン衝突でのトップクォーク対生成・崩壊における終状態レプトン運動量分布と非標準トップ相互作用

We study the momentum distributions of the final-state charged lepton in parton-parton collisions q¯q, gg →
t¯t → +X ( = e or μ), considering their application to actual experimental-data analyses at high-energy
hadron colliders, i.e., Tevatron and Large Hadron Collider (LHC). Assuming general anomalous t¯tg + t¯tgg
and tbW couplings, we derive analytical formulas for the above distributions based on Kawasaki-Shirafuji-Tsai
formalism. We there take into account all the terms on the former-coupling parameters while up to the linear
terms about the latter. We then calculate the lepton energy- and angular-distributions to clarify how they
are affected by the anomalous couplings, and also search, through the total cross sections, for the parameter
range where quadratic (or higher-order) terms of nonstandard QCD couplings can safely be neglected and
consequently we can carry out the optimal-observable analysis properly for estimating the expected statistical
uncertainties in parameter measurements.