Tetraquarks, their masses and decays in QED2

A bstract Recent observations by Belle and BESIII of charged quarkonium-like resonances give new stimulus for theoretical investigation of exotic hadrons in general and heavy tetraquarks in particular. We use QED 2 , a confining theory, as a model for the masses and decays of tetraquarks. Here we discuss the states and (and its anti-particle), where Q and q are two fermion flavors with masses M and m , so that M >m . Wethendiscussdecaymodesofthesestatesinto , , , . Itturns out that is stable, while is not.