Search for Anomalous Couplings in Top Decay at Hadron Colliders

Details Search for Anomalous Couplings in Top Decay at Hadron Colliders Search for Anomalous Couplings in Top Decay at Hadron Colliders

2005-12-15

arxiv.org/abs/hep-ex/0512037v1

Phys.Rev. D73 (2006) 054011

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages, 15 figures

Scientific paper

10.1103/PhysRevD.73.054011

We present a quantitative study on sensitivities to the top-decay anomalous couplings, taking into account realistic experimental conditions expected at Tevatron and LHC. A double angular distribution of W and charged lepton in the top decay is analyzed, using ttbar events in the lepton+jets channel. In order to improve sensitivities to the anomalous couplings, we apply two techniques: (1) We use a likelihood fitting method for full kinematical reconstruction of each top event. (2) We develop a new effective spin reconstruction method for leptonically-decayed top quarks; this method does not require spin information of the antitop side. For simplicity, we neglect couplings of right-handed bottom quark as well as CP violating couplings. The 95% C.L. estimated bound on a ratio of anomalous couplings reads -0.81 < f_2/f_1 < -0.70, -0.12

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