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The effect of nonperturbative and higher order perturbative corrections toall the free nucleon structure functions ($F_{iN}(x,Q^2); i=1-5$) in the DIS of$\nu_\tau/{\bar\nu}_\tau$ on nucleon is studied.  The target mass correction (TMC) and higher twist (HT) effects areincorporated following the works of Kretzer et al. and Dasgupta et al.,respectively.  The evaluation of the nucleon structure functions has been performed by usingthe MMHT 2014 parameterization of the parton distribution functions (PDFs). Thecalculations have been performed at the next-to-leading(NLO) order.  These nucleon structure functions (SF) are used to calculate the DIS crosssection by further including the kinematical corrections due to $\tau$-leptonmass.  Due to the inclusion of lepton mass two additional structure functions$F_{4N}(x,Q^2)$ and $F_{5N}(x,Q^2)$ become non-negligible.  The results for the nucleon structure functions, differential and totalscattering cross sections are presented. The various effects considered in thiswork are effective in the different regions of $x$ and $Q^2$, and quiteimportant in the energy region of  $E_{\nu_\tau/{\bar\nu}_\tau} < 15$ GeV. A comparative study of our resultswith the existing  results in the literature for the cross  sections is made in the energy region of interest for the DUNE, SHiP, DsTau  and HyperK experiments proposed to be done in the near future.

Nonperturbative and higher order perturbative effects in deep inelastic $\nu_\tau/\bar\nu_\tau-$nucleon scattering