Seminarium Fizyki Wielkich Energii
sala 1.03, ul. Pasteura 5
2016-01-15 (10:15) 
prof. dr hab. Wojciech Wislicki (NCBJ)
Discovery of pentaquark states by the LHCb at CERN
We report on observation of two exotic structures in the J/Psi p system from decays Lambda^0_b -> J/Psi p K-. The data sample of the integrated luminosity 3 fb^-1 was aquired by the LHCb detector. Massess of these states are 4380+/-8+/-29 MeV and 4450+/-2+/-3 MeV. The preferred J^P assignments are 3/2^- and 5/2^+ and signicance of each exceeds 9 standard deviations. The states are refered to as the charmonium pentaquark states.