TY  - JOUR
AU  - Jantzen, B.
AU  - Ruiz-Femenia, P.
PY  - 2013
DA  - 2013//
TI  - Next-to-next-to-leading order nonresonant corrections to threshold top-pair production from e(+)e(-) collisions: Endpoint-singular terms
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 054011
EP  - 20pp
VL  - 88
IS  - 5
PB  - Amer Physical Soc
AB  - 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)).
SN  - 1550-7998
UR  - http://arxiv.org/abs/1307.4337
UR  - https://doi.org/10.1103/PhysRevD.88.054011
DO  - 10.1103/PhysRevD.88.054011
LA  - English
N1  - WOS:000324232700007
ID  - Jantzen+Ruiz-Femenia2013
ER  -