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トップクォーク対生成スピン偏極度相関におけるパリティーの破れの探索

トップクォーク対生成スピン偏極度相関におけるパリティーの破れの探索. 2011 年度 FNAL 組 Hou orientation Feb. 21, 2012. 武内勇司. 素粒子実験室. Tevatron Run II. Chicago. CDF. DØ. TEVATRON. MAIN INJECTOR. Tevatron Proton-antiproton collisions at √s = 1.96 TeV Shutdown on Sep. 30, 2011 Final dataset: ~10 fb -1 expected for physics.

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トップクォーク対生成スピン偏極度相関におけるパリティーの破れの探索

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  1. トップクォーク対生成スピン偏極度相関におけるパリティーの破れの探索トップクォーク対生成スピン偏極度相関におけるパリティーの破れの探索 2011年度FNAL組 Hou orientation Feb. 21, 2012 武内勇司 素粒子実験室

  2. Tevatron Run II Chicago CDF DØ TEVATRON MAIN INJECTOR • Tevatron • Proton-antiproton collisions at √s = 1.96 TeV • Shutdown on Sep. 30, 2011 • Final dataset: ~10 fb-1 expected for physics

  3. 生成と崩壊 85% g g g g + + 15% g g g • Lepton+Jet • 1 lepton • 4 jet(2 b-jet) • MET • All Hadronic • 6 jet(2 b-jet) • Dilepton • 2 lepton • 2 b-jet • MET Categorize ttbar events into 3 decay types according to W decay mode

  4. Spin states in (near threshold): Conservation of angular momentum down-type Beam 軸に対するレプトンの飛翔方向角度分布 トップ・反トップの偏極とレプトン飛翔方向

  5. Parity of はパリティを破る P-reversal

  6. dilepton channel の最近の結果 CDF 5.1 fb-1 dilepton Suggesting V+A coupling?

  7. 前後方非対称性 後方 前方 g g F: or X B: or rest frame A? 標準模型NLO prediction: Interference between LO and NLO 2 + g (NLO) 標準模型を超える物理の寄与など g 2 + V

  8. Afb results at Tevatron D0 5.4fb-1l+jets CDF 5.3 fb-1l+jets • 予想より大きな前後方非対称性 • V-A or V+A結合の可能性を示唆 CDF 5.1 fb-1dilepton

  9. Fit function form w/o P conservation

  10. 作業の流れ backgroundの分布を関数でfit 5.1fb-1の結果のヒストグラム(5x5bin)をbkg+signalの関数でfit 5.1fb-1の結果をヒストグラムではなく，candidate の334事象を使って unbinned likelihood fit 月曜日(3/12, 3/19)のdilepton meetingでstatusを発表 CDF note にまとめる

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