This work has been supported by BAYLAT, project nr. 914-20.1.1. T.F. and W.P. have been supported by the DFG, project nr. PO-1337/3-1. J.J.P. acknowledges funding by the Dirección de Gestión de la Investigación at PUCP, through grant DGI-2015-3-0026. N.C.V. has been supported by CienciActiva-CONCYTEC Grant 026-2015. We also acknowledge the financial support of PUCP DARI Groups Research Fund 2016. We would especially like to thank O. A. Díaz in the Dirección de Tecnologías de Información at PUCP, for implementing the code within the LEGION system.

We investigate a scenario inspired by natural supersymmetry, where neutrino data is explained within a low-scale seesaw scenario. For this the minimal supersymmetric Standard Model is extended by adding light right-handed neutrinos and their superpartners, the R-sneutrinos. Moreover, we consider the lightest neutralinos to be Higgsino-like. We first update a previous analysis and assess to which extent does existing LHC data constrain the allowed slepton masses. Here we find scenarios where sleptons with masses as low as 175 GeV are consistent with existing data. However, we also show that the upcoming run will either discover or rule out sleptons with masses of 300 GeV, even for these challenging scenarios. We then take a scenario which is on the borderline of observability of the upcoming LHC run assuming a luminosity of 300 fb-1. We demonstrate that a prospective international e+e- li...