Speaker
Estia Eichten
Description
The status of narrow states in heavy quark systems is discussed. For states with only heavy valence quarks these are generally states without Zweig allowed decays. The special case of the X(3872) is reexamined in light of new measurements.
For systems with heavy quarks plus light degrees of freedom three systems are discussed: (1) The j=1/2 1P states of heavy-light mesons, (2) The stability of some ground state tetraquark systems, (3) For doubly heavy baryons (ccs, cbs, bbs) the lowest 1P states will be narrow.
