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Top quark production near threshold: NNLO QCD correction
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We calculate the cross section of the process e^+e^- \to t\bar t near threshold by resumming Coulomb-like terms with next-to-next-to-leading (NNLO) accuracy. The nonrelativistic Green function formalism and the method of ``direct matching'' are used. The NNLO correction turns out to be large, of the same size as the NLO correction. It changes the position and the normalization of the 1S-peak. The obtained results are compared with results existing in the literature.
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Toponia at the HL-LHC and FCC-ee
Toponium ηt and ψt states have promising discovery channels at HL-LHC (ηt b bbar, about 6σ) and FCC-ee (ψt interference in b bbar, about 14σ), while P-wave states remain out of reach.
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