Radial excitations of pseudoscalar mesons Original Research Article

The η(1440) seems to be split into two components, an η(1410) and an η(1470). The splitting might signal a node in the η(1440) wave function suggesting that the η(1440) is a radial excitation. The partial width of the η(1440) for the ϱγ decay leaves a little room for an exotic interpretation of the η(1440). The production rate of the η(1440) in p̄p annihilation is similar to that of the π(1300) which was observed in its ϱπ decay. No evidence was observed for the η(1295). If the latter exists its production must be much weaker than that of the π(1300) by about a factor 100. If the latter is assigned to the 21S0 nonet, the η(1295) cannot belong to this nonet. Then a new pseudoscalar nonet emerges consisting of π(1300), η(1440), η(1760) and K(1460).