[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Wed., Jan. 7, 2015
CEBAF Center, Room L102
1:00 p.m.

Alessandro Pilloni
Sapienza University, Rome

*Exotic Hadron Spectroscopy *

The past decade witnessed a remarkable proliferation of exotic 
charmonium-like resonances
discovered at accelerators. In particular, the recently observed charged 
states are clearly not
interpretable as q-qbar mesons. Notwithstanding the considerable 
advances on the experimental
side, conflicting theoretical descriptions do not seem to provide a 
definitive picture about the
nature of the so-called XYZ particles. I will discuss why the recent 
experimental discoveries speak
in favour of the existence of compact four-quark particles (tetraquarks).
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