THE GLUEBALL CANDIDATE η(1440) AS η RADIAL EXCITATION

摘要

The Particle Data Group decided to split the η(1440) into two states, called η_L and η_H. The η(1295) and the η_H are supposed to be the radial excitations of the η and η′, respectively. The η_L state cannot be accomodated in a quark model; it cannot be a qq state, however, it might be a glueball. In this contribution it is shown that that the η(1295) does not have the properties which must be expected for a radially excited state. The splitting of the η(1440) is traced to a node in the wave function of a radial excitation. Hence the two peaks, η_L and η_H , originate from one resonance which is interpreted here as first radial excitation of the η.