from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a class of hypothetical bosons that would decay into a lepton and a quark.
Sorry, no etymologies found.
So, if were seeing more leptons and missing pt than expected coming from decays, maybe its because they have some other intermediate decay channel, like a charged Higgs, or something totally weird like a half-quark/half-lepton thing called a leptoquark.
I wrote a story once about the apparent discovery of an peculiar high-energy physics particle, tentatively dubbed the leptoquark.