Probing Majorana neutrino textures at DUNE

We study the possibility of probing different texture zero neutrino mass matrices at the long baseline neutrino experiment DUNE, particularly focusing on its sensitivity to the octant of atmospheric mixing angle theta(23) and leptonic Dirac CP phase delta cp. Assuming a diagonal charged lepton basis and Majorana nature of light neutrinos, we first classify the possible light neutrino mass matrices with one and two texture zeros and then numerically evaluate the parameter space which satisfies the texture zero conditions. Apart from using the latest global fit 3 sigma values of neutrino oscillation parameters, we also use the latest bound on the sum of absolute neutrino masses (Sigma(i vertical bar)m(i vertical bar)) from the Planck mission data and the updated bound on effective neutrino mass M-ee from neutrinoless double beta decay (0v beta beta) experiments to find the allowed Majorana texture zero mass matrices. For the allowed texture zero mass matrices from all these constraints, we then feed the corresponding light neutrino parameter values satisfying the texture zero conditions into the numerical analysis in order to study the capability of DUNE to allow or exclude them once it starts taking data. We find that DUNE will be able to exclude some of these texture zero mass matrices which restrict (theta(23)-delta(cp)) to a very specific range of values, depending on the values of the parameters that nature has chosen.