We study the deep inelastic process $\nu_{ \tau} + { \cal N} \to \tau^{ -} + X$ (with ${ \cal N} \equiv (n+p)/2$ an isoscalar nucleon), in the context of the two Higgs doublet model { \it type two} (2HDM(II)). In particular, we discuss the contribution to the total cross section of diagrams, in which a charged Higgs boson is exchanged. We show that for large values of $\tan\beta$ such contribution for an inclusive dispersion generated through the collision of an ultrahigh energy tau-neutrino on a target nucleon can reach up to 57% of the value of the contribution of the $W^+$ exchange diagrams (i.e. can reach up to 57% of the standard model (SM) prediction) and could permit to distinguish between the SM and the 2HDM(II) predictions at the Pierre Auger Observatory.
Categories: hep-ph