  In this paper, we argue that an extension of the Standard Model with a single
leptoquark and three right-handed neutrinos can explain the excess in the
first-generation leptoquark search at the LHC. We also find that when the
leptoquark has similarly sized couplings to all three generations, it produces
additional signals which will soon be tested in the second- and
third-generation leptoquark searches, as well as in decay channels consisting
of two mixed flavor leptons and two jets. If the leptoquark only couples to the
first generation, on the other hand, two of the right-handed neutrinos need to
be fairly degenerate in mass with the leptoquark while the other right-handed
neutrinos mass should be much lighter. This hierarchical structure could
explain dark matter and the baryon asymmetry of the Universe. These simple
models may be regarded as benchmark models for explaining the excess, which can
be tested in the next stage of the LHC running.
