  We discuss gauge mediation models in which the smuon and the selectron are
mass-degenerate co-NLSP, which we, for brevity, refer to as selectron NLSP. In
these models, the stau, as well as the other superpartners, are parametrically
heavier than the NLSP. We start by taking a bottom-up perspective and
investigate the conditions under which selectron NLSP spectra can be realized
in the MSSM. We then give a complete characterization of gauge mediation models
realizing such spectra at low energies. The splitting between the slepton
families is induced radiatively by the usual hierarchies in the Standard Model
Yukawa couplings and hence, no new sources of flavour misalignment are
introduced. We construct explicit weakly coupled messenger models which give
rise to selectron NLSP, while accommodating a 126 GeV MSSM Higgs mass, both
within the framework of General Gauge Mediation and in extensions where direct
couplings between the messengers and the Higgs fields are present. In the
latter class of models, large A-terms and relatively light stops can be
achieved. The collider signatures of these models typically involve multilepton
final states. We discuss the relevant LHC bounds and provide examples of models
where the decay of the NLSP selectron is prompt, displaced or long-lived. The
prompt case can be viewed as an ultraviolet completion of a simplified model
recently considered by the CMS collaboration.
