2000/04/04 by T. Nagano, Takaaki Nagano, Nagano, Takaaki
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0004026
154 pages, LaTeX2e, 87 EPS files. Doctoral thesis. The first half of the thesis is based on hep-ph/9903498. A part of it is reproduced also in hep-ph/0001286. The second half of the thesis is based on hep-ph/0001322
arxiv created 2000/04/04 · openalex publication_date 2000/04/04 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
It was reported that the NNLO correction to the total cross section near the ttbar threshold in e+e- collisions is as large as the NLO correction to it. In the thesis, we improve the convergence of the perturbative series of the total cross section by choosing appropriate expansion parameters for both mt and alphas. With these two prescriptions, the perturbative convergence is much improved. Correspondingly, the resulting ambiguity for the determination of mt is estimated to be 0.1GeV. We also study the effect of all types of anomalous top-quark EDM interactions near the threshold for the first time. We show that one can disentangle these EDMs by the dependence of CP-odd observables on the CM-energy and on the degree of initial state polarization. The sensitivity to chromo-EDM at LC turns out to be better than that at LC in the open top region, but to be worse than that at LHC by a factor 1/10. The sensitivities to electroweak-EDMs near the threshold are similar to those in the open top region at LC.