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

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  • パートン ショウトツ デノ トップ クォーク タイセイセイ ホウカイ ニオケル シュウジョウタイ レプトン ウンドウリョウ ブンプ ト ヒヒョウジュン トップ ソウゴ サヨウ
  • Anomalous top-couplings and momentum distributions of the final-lepton from ttbar productions/decays in parton collisions

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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.

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