Properties of soft radiation near t and W+W− threshold

Yu.L. Dokshitzer, V.A. Khoze, Lynne H. Orr, W.J. Stirling
1993 Nuclear Physics B  
We discuss the characteristic interference features of soft radiation in the threshold production of heavy unstable particles: soft gluon radiation in → and soft photon radiation in →. We show that the heavy particle decay width controls the interference between the emission off the final state particles. As a result, the radiation pattern may provide a way of measuring the decay width of the heavy particles.
doi:10.1016/0550-3213(93)90029-o fatcat:ewvk354pgfdnvosxtvaervjdxu