EPJ

2023 Impact factor 4.2
EPJ C - Particles and Fields
Particles and Fields
Eur. Phys. J. C 5, 507-516
DOI 10.1007/s100529800871

Study of the nature of $\bf \iota/\eta(1440)$
in the chiral perturbation theory approach

M. L. Nekrasov

Institute for High Energy Physics, 142284 Protvino, Russia (e-mail: nekrasov@mx.ihep.su)

Received: 25 November 1997 / Revised version: 6 January 1998 / Published online: 24 April 1998

Abstract
The nature of $\iota/\eta(1440)$ is analysed in the framework of the hypothesis that it represents a single pseudoscalar resonance. Assuming that it arises due to the mixing between the glueball and the $q\bar q$ nearby states ($\eta$, $\eta'$, and their radial excitations) two upper estimates are obtained for the partial width $\Gamma(\iota/\eta(1440) \rightarrow K^* K)$-- one for the case when $\iota/\eta(1440)$ is mainly a glueball and another one when it is mainly a radial excitation of the $s\bar s$ state. Both estimates are obtained in the chiral perturbation theory approach taking into account the available data on the vector mesons and the pseudoscalar state K(1460), which is interpreted as a radial excitation of the K meson. The same partial width is independently estimated on the basis of the combined OBELIX and Crystal Barrel data on the production of $\iota/\eta(1440)$ in $p\bar p$ annihilation. Comparing the results we show that the glueball content of $\iota/\eta(1440)$ is suppressed while its $s\bar s$radial-excitation interpretation is favoured by the data.

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