#CMSPaper 1234: #leptoquarks are hypothetical particles that interact with leptons and quarks, and they occur in many theories of physics beyond the standard model. This specific paper looks for leptoquarks in the (very) rare collisions where the LHC collides a lepton with a quark. This is a very novel method; it's not easy to select such collisions! It's a nullresult, but is so innovative that many improvements are still possible in the future.