Exotic Pentaquark observation at LHCb
Liming Zhang
Tsinghua University
Lundi 21/03/2016, 11:00-12:00
Bat 141, salle André Berthelot (143) Masque recommandé, CEA Paris-Saclay

I will discuss the discovery of two pentaquark states both decaying into a J/ψ meson and a proton. The decay mode defines the quark content as c cbar, u, u, d, and thus are called charmonium pentaquarks. These exotic structures are found in Λb→J/ψ K- p decays using a full amplitude analysis using 7 and 8 TeV pp collisions from 3/fb of data collected by the LHCb experiment. The two states will be shown to be of opposite parity and have spins 3/2 and 5/2. Finally different models of pentaquark structure will be discussed.


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