Searches for exotic X , Y , and Z

    Abstract

    Recently, several charmonium-like states above D ¯ D threshold have been discovered at the BELLE and BABAR B-factories. Some of these states are produced via Initial State Radiation (e.g. Y (4260) and Y (4350)) and some are observed in B meson decays (e.g. X(3872), Y (3940)). The BELLE observation of the enhancement in the ψ(2S)π − , i.e. the Z(4430… (More)

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