Abstract
Several charmonium-like states above D D ¯ threshold have been discovered at the Belle and BaBar B -factories. Some 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 ) , and Z ( 4430 ) − ). The Z ( 4430 ) − state has generated a great deal of interest, having minimum quark content ( c c ¯ d u ¯ ) and, thus, representing the unequivocal manifestation of a four-quark meson state. Here we summarize recent BaBar results on the Y ( 4260 ) , X ( 3872 ) , Y ( 3940 ) , and on a search for the Z ( 4430 ) − .
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