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SUMMARY:The XYZ-files: Exotic states in the heavy quarkonium spectrum - Pa
 blo Ortega\, University of Salamanca 
DTSTART:20180529T140000Z
DTEND:20180529T150000Z
UID:TALK101299@talks.cam.ac.uk
CONTACT:Lorena Escudero
DESCRIPTION:Between November 1974\, when the J/\\psi particle was discover
 ed\, until 2003\, when the X(3872) resonance was described by the Belle Co
 llaboration\, the quarkonium spectrum was satisfactorily\ndescribed by nai
 ve quark models. However\, the exploration of energies above the D\\bar D 
 threshold has led to the appearance of unexpected states\, the so-called X
 YZ states\, difficult to accommodate in the naive picture of a q\\bar q bo
 und states.\n\nA common feature among all these exotic states is the prese
 nce of nearby two particle thresholds.  This coincidence reinforces the in
 tuition that the residual interaction between such two particles can form 
 a molecular state.  The description of this type of structures is very tri
 cky from a theoretical point of view because the strength of the residual 
 interaction is usually model dependent and one can generate spurious state
 s if this interaction is not under control.\n\nIn this talk I will review 
 the state of meson-meson and baryon-meson molecules calculations\, using a
  constituent quark model that has been applied to a wide range of hadronic
  observables\, and therefore all model parameters are completely constrain
 ed.
LOCATION:Ryle Seminar Room (Rutherford 930) 
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