Pentaquark states with hidden charm

Abstract

I develop an extension of the usual three-flavor quark model to four flavors (u, d, s and c), and discuss the classification of pentaquark states with hidden charm. This work is motivated by the recent observation of such states by the LHCb Collatoration at CERN.

Comments: 6 pages, 1 figure, 3 table, plenary talk at XL Symposium on Nuclear Physics, Cocoyoc, Mexico, January 5-8, 2017. To be published in Journal of Physics: Conference Series