Nonrelativistic effective field theory of unstable top
High Energy Physics - Phenomenology
2012-11-28 v1
Abstract
We develop a new nonrelativistic effective field theory of NRQCD [1] to describe the finite lifetime effects in the threshold production of top quark-antiquark pairs. The theory is based on the expansion in a parameter characterizing the dynamics of the top-quark decay. Within this framework we compute the nonresonant contribution to the total cross section of the top quark-antiquark threshold production in electron-positron annihilation up to the next-to-next-to-leading order. Our method naturally resolves the problem of spurious divergences in the analysis of the unstable top production.
Keywords
Cite
@article{arxiv.1209.3821,
title = {Nonrelativistic effective field theory of unstable top},
author = {Alexander A. Penin and Jan H. Piclum},
journal= {arXiv preprint arXiv:1209.3821},
year = {2012}
}
Comments
9 pages, 4 figures, talk given at the conference "Loops and Legs in Quantum Field Theory", Wernigerode, Germany, 15-20 April 2012