New States and Charmonium Spectroscopy at BaBar Original Research Article

Several charmonium-like states above View the MathML source 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 View the MathML source 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).