Colloquium: Narrow LHCb Pentaquarks: Experiment and Theory

11/18/2016 - 3:30pm to 4:30pm
Speaker(s) / Presenter(s): 
Prof. Michael Eides, University of Kentucky
Type of Event (for grouping events):

Exotic hidden charm pentaquarks were discovered by the LHCb Collaboration in summer 2015. I discuss  two interpretations of these  newly discovered particles. In the QCD inspired hadrocharmonium approach pentaquarks arise naturally as bound states of quarkonia excitations and ordinary baryons. Decay width of the P_c(4450) LHCb pentaquark is explained and calculated, masses and quantum numbers of new pentaquarks are predicted.  In another approach pentaquarks are interpreted as molecular-type loosely bound  states of hadrons with  open charm. Binding in this model is due to the one-pion exchange and interplay of partial waves with different angular momenta.  The hadroquarkonium and molecular approaches  to exotic hadrons are compared and their relative advantages and drawbacks are discussed.

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