TY  - JOUR
AU  - Ruiz-Femenia, P.
PY  - 2014
DA  - 2014//
TI  - First estimate of the NNLO nonresonant corrections to top-antitop threshold production at lepton colliders
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 097501
EP  - 4pp
VL  - 89
IS  - 9
PB  - Amer Physical Soc
AB  - We compute the dominant term in the expansion in rho = 1 – M-w/m(t) of the unknown next-to-next-to-leading order nonresonant contributions to the e+ e(-) -> W+ W- b (b) over bar total cross section at energies close to the top-antitop threshold. Our analytic result disagrees with a previous calculation by other authors [A. A. Penin and J. H. Piclum, J. High Energy Phys. 01 (2012) 034]. We show that our determination has the correct infrared structure needed to cancel the divergences proportional to the top width arising in the resonant production of the same final state, and we point to a missing contribution in the computation of Penin and Piclum to explain the discrepancy.
SN  - 1550-7998
UR  - http://arxiv.org/abs/1402.1123
UR  - https://doi.org/10.1103/PhysRevD.89.097501
DO  - 10.1103/PhysRevD.89.097501
LA  - English
N1  - WOS:000342348500005
ID  - Ruiz-Femenia2014
ER  -