The Glueball Candidate η(1440) as ηRadial Excitation
Abstract
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
q
q
¯
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
.