Nonstandard heavy mesons and baryons: Experimental evidence
Nonstandard heavy mesons and baryons: Experimental evidence
Since the inception of the quark model we have known the simplest examples, mesons made of a quark and antiquark and baryons made of three quarks. But it has long been recognized that more complex structures such as quark-quark-antiquark-antiquark or quark-antiquark-gluon mesons were possible. Such exotic states involving only the …