%0 Journal Article %T Next-to-next-to-leading order nonresonant corrections to threshold top-pair production from e(+)e(-) collisions: Endpoint-singular terms %A Jantzen, B. %A Ruiz-Femenia, P. %J Physical Review D %D 2013 %V 88 %N 5 %I Amer Physical Soc %@ 1550-7998 %G English %F Jantzen+Ruiz-Femenia2013 %O WOS:000324232700007 %O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1581), last updated on Thu, 10 Oct 2013 14:57:29 +0000 %X We analyze the subleading nonresonant contributions to the e(+)e(-) -> W(+)W(-)b (b) over bar cross section at energies near the top-antitop threshold. These correspond to next-to-next-to-leading-order (NNLO) corrections with respect to the leading-order resonant result. We show that these corrections produce 1/epsilon endpoint singularities which precisely cancel the finite-width divergences arising in the resonant production of the W(+)W(-)b (b) over bar final state from on-shell decays of the top and antitop quarks at the same order. We also provide analytic results for the (m(t)/Lambda)(2), (m(t)/Lambda) and (m(t)/Lambda)(0) log Lambda terms that dominate the expansion in powers of (Lambda/m(t)) of the complete set of NNLO nonresonant corrections, where Lambda is a cut imposed on the invariant masses of the bW pairs that is neither too tight nor too loose (m(t)Gamma(t) << Lambda(2) << m(t)(2)). %R 10.1103/PhysRevD.88.054011 %U http://arxiv.org/abs/1307.4337 %U https://doi.org/10.1103/PhysRevD.88.054011 %P 054011-20pp