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The Littlest Seesaw (LS) model involves two right-handed neutrinos and a veryconstrained Dirac neutrino mass matrix, involving one texture zero and twoindependent Dirac masses, leading to a highly predictive scheme in which allneutrino masses and the entire PMNS matrix is successfully predicted in termsof just two real parameters. We calculate the renormalisation group (RG)corrections to the LS predictions, with and without supersymmetry, includingalso the threshold effects induced by the decoupling of heavy Majorananeutrinos both analytically and numerically. We find that the predictions forneutrino mixing angles and mass ratios are rather stable under RG corrections.For example we find that the LS model with RG corrections predicts close tomaximal atmospheric mixing, $\theta_{23}=45^\circ \pm 1^\circ$, in mostconsidered cases, in tension with the latest NOvA results. The techniques usedhere apply to other seesaw models with a strong normal mass hierarchy.

Renormalisation Group Corrections to the Littlest Seesaw Model and Maximal Atmospheric Mixing