Constraining axial non-standard neutrino interactionswith MINOS and MINOS+

We show that the neutral current data of the MINOS and MINOS+ experiments can provide information on the axial neutral current non-standard interactions of neutrinos with the u and d quarks; i.e., on ε α βAq. ϵ α β Aq . We derive bounds on the ee , eτ e τ and τ τ τ τ components of these couplings and show that the MINOS(+) bounds on ε Aqeτ ϵ e τ Aq and ε Aqτ τ ϵ τ τ Aq are currently the world leading ones. The bound on the isospin singlet case, ε Auτ τ=ε Adτ τ ϵ τ τ Au = ϵ τ τ Ad is of particular interest because while this isospin singlet NSI is theoretically motivated, it was practically unconstrained before these results.