Name that particle

CALL TO ACTION!
The symmetry challenge:
Name that particle
Flerbs? Marteenies?? Tom, Dick, and Harry???
Cartoonist Roz Chast has busted the field of particle physics wide open with her pioneering cover for this issue of symmetry. We say it's about time: Why limit ourselves to the same old list of particles that have actually been discovered, or at least properly theorized? So here's the challenge: Invent an elementary particle and tell us what it does in 30 words or fewer. A drawing would be nice, but not mandatory. Send your entry toletters@symmetrymagazine.org with subject line "Contest" or mail it to us. The winner will receive an autographed copy of Roz Chast's cover and a place of honor for their entry in an upcoming issue.