Séminaires
Sheldon Stone (Syracuse) : Recent results on pentaquark baryons and selected tetraquark mesons
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Europe/Paris
Amphi Charpak (LPNHE)
Amphi Charpak
LPNHE
Description
I discuss the discovery of two pentaquark states both decaying into a J/psi 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 /\b->J/psi 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. I will also present a determination of spin parity of the the Z(4430) tetraquark meson, also a charmonium state. Finally different models of pentaquark structure will be discussed.
Noter bien l'heure exceptionnelle.
Il y aura un pause café avant le séminaire, à 10h45.