Two-loop QCD corrections to top quark width
高能物理 - 唯象学
2009-10-31 v1
摘要
We present O(alpha_s^2) corrections to the decay t-->bW in the limit of a very large top quark mass, m_t >> m_W. We find that the O(alpha_s^2) effects decrease the top quark decay width Gamma_t by about 2%: Gamma_t = Gamma_0(1-0.8alpha_s(m_t)-1.7alpha_s^2). The complete corrections are smaller by about 24% than their estimate based on the BLM effects O(beta_0 alpha_s^2). We explain how to compute a new type of diagrams which contribute to Gamma(t --> bW) at the O(alpha_s^2) level.
引用
@article{arxiv.hep-ph/9806244,
title = {Two-loop QCD corrections to top quark width},
author = {Andrzej Czarnecki and Kirill Melnikov},
journal= {arXiv preprint arXiv:hep-ph/9806244},
year = {2009}
}
备注
11 pages, latex