Springer LINK: The European Physical Journal C - Abstract Volume 5 Issue 3 (1998) pp 507-516

The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 5 Issue 3 (1998) pp 507-516
DOI 10.1007/s100529800871

theoretical physics:
Study of the nature of $\iota/\eta(1440)$ 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.

Article in PDF-Format (306 KB)
Article in (gzipped) PS-Format (183 KB)

The European Physical Journal C

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

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