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In the upcoming LHC Run 2, at $\sqrt{s} \sim13$ TeV, it is suggested to seekunusually charged ($Q= -4/3$ and $+5/3$) quarks with mass $M_Q \sim 3$ TeVwhich carry lepton number ($L = +2$ and $-2$ respectively) and decaysuperweakly to a bilepton $Y$ with mass $M_Y\sim2.5$ TeV and a usual quark.These long-lived decays will have displaced decay vertices and produce astriking final state in $pp$ which contains two separated jets together withtwo pairs of correlated like-sign charged leptons. Such a process wasinaccessible energetically in LHC Run 1 with $\sqrt{s} \sim8$ TeV. The simplesttheoretical explanation is the 331-model which has new physics necessarilybelow $4$ TeV and which explains the existence of three families by anomalycancellation.

Lepton Number Conservation, Long-lived Quarks and Superweak Bileptonic Decays