Top Width Effects in Soft Gluon Radiation
  Soft gluons radiated in top quark production and decay can interfere in a way that is sensitive to the top width. We show how the width affects the gluon distribution in $e^+e^- \rightarrow t {\bar t}$ and discuss prospects for measuring $\Gamma$ from gluons radiated near $\tt$ threshold. 
Lynne H. Orr, Yu.L. Dokshitzer, V.A. Khoze, and W.J. Stirling