K0s K0s Final State in Two-Photon Collisions and Implications for Glueballs

TL;DR

This study analyzes the K0s K0s final state in two-photon collisions at LEP, identifying tensor mesons and setting limits on a glueball candidate, providing insights into meson spectroscopy and glueball searches.

Contribution

It presents the first detailed measurement of the K0s K0s final state in two-photon collisions, including resonance observations and limits on glueball candidates.

Findings

Observation of the f_2'(1525) tensor meson with specific two-photon width

Detection of the f_J(1710) resonance dominated by spin-two state

No significant signal for the xi(2230) glueball candidate, setting upper limits

Abstract

The K0s K0s final state in two-photon collisions is studied with the L3 detector at LEP. The mass spectrum is dominated by the formation of the f_2'(1525) tensor meson in the helicity-two state with a two-photon width times the branching ratio into K Kbar of 76 +- 6 +- 11 eV. A clear signal for the formation of the f_J(1710) is observed and it is found to be dominated by the spin-two helicity-two state. No resonance is observed in the mass region around 2.2 GeV and an upper limit of 1.4 eV at 95% C.L. is derived for the two-photon width times the branching ratio into K0s K0s for the glueball candidate xi(2230).