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Abstract |
The discovery of a plethora of new heavy hadrons in experimental
facilities during the last few years calls for their theoretical
interpretation. While many of them are standard three-quark baryons
and quark-antiquark mesons, others do not fit this explanation and
are suspected to be exotic. A few might be "molecular states", i.e.
composite hadrons that are bound states of two hadrons and thus
analogous to the deuteron in nuclear physics. Here I will present
a brief overview of the most promising molecular candidates and
the issues related to them from the effective field theory
perspective. In particular I will address the problem of how can
we know whether a state is molecular, what are probable molecular
interpretations of a few of these states and what concrete
predictions can be made about them. |
