Fig. 1.

The ${\tau }_{21}$ (upper) and ${\tau }_{21}^{\mathrm{DDT}}$ (lower) profile dependencies on ${\rho }^{\prime }=ln(m_{\mathrm{jet}}^2/(p_{\mathrm{T}}\mu ))$ examined in QCD multijet events simulated with pythia . A fit to the linear part of the spectrum for $p_{\mathrm{T}}>200\text{Ge}$ yields the slope $M=-0.080$, which is used to define the mass- and $p_{\mathrm{T}}$-decorrelated variable ${\tau }_{21}^{\mathrm{DDT}}={\tau }_{21}-M{\rho }^{\prime }$