Table 2.

The seven input variables to the NN ordered by their discriminating power. The jet that is not b-tagged is referred to as untagged jet

Variable symbol	Definition
m(jb)	The invariant mass of the untagged jet (j) and the b-tagged jet (b)
$|\mathit{\eta }(j)|$	The absolute value of the pseudorapidity of the untagged jet
$m(\ell \mathit{\nu }b)$	The invariant mass of the reconstructed top quark
$m_{\mathrm{T}}(\ell E_{\text{T}}^{\text{miss}})$	The transverse mass of the lepton–$E_{\text{T}}^{\text{miss}}$ system, as defined in Eq. (2)
$|\mathrm{\Delta }\mathit{\eta }(\ell \mathit{\nu },b)|$	The absolute value of $\mathrm{\Delta }\mathit{\eta }$ between the reconstructed W boson and the b-tagged jet
$m(\ell b)$	The invariant mass of the charged lepton ($\ell$) and the b-tagged jet
$cos{\mathit{\theta }}^{\ast }(\ell ,j)$	The cosine of the angle, ${\mathit{\theta }}^{\ast }$, between the charged lepton and the untagged jet in the rest frame of the reconstructed top quark