The K0sK0s Final State in Two-Photon Collisions and Some Implications for Glueball Searches

The K0sK0s final state in two-photon collisions is studied with the L3 detector at LEP using data at centre of mass energies from 91 GeV to 183 GeV. The K0sK0s mass spectrum is dominated by the formation of the f_2'(1525) tensor meson whose two-photon partial width is measured. Clear evidence for destructive f_2-a_2 interference is observed. No signal is present in the region around 2.2 GeV. An upper limit for the two-photon partial width times the K0sK0s branching ratio of the \xi(2230) glueball candidate is then derived. An enhancement is observed around 1750 MeV. It may be due to the formation of a radial recurrence of the f_2'(1525) or to the s\bar{s} member of the 0++ meson nonet.Comment: 7 pages, 5 figures, Invited contribution to LEAP98, Villasimius, Italy, September 199

Illuminating hadron structure by scattering light on light

The results of an Amplitude Analysis of the world data on integrated and differential cross-sections on $\gamma\gamma\to\pi\pi$ are presented, following the publication of the Belle charged pion results.Comment: 5 pages, 7 figures. To appear in the Proceedings of the International Workshop on $e^+e^-$ collisions from $\phi$ to $\psi$, Frascati, April 2008. This version rewords the reference to the work of Achasov and Shestakov, with apologies to them for any misunderstandin

RESONANT PRODUCTION OF VECTOR MESONS BY POLARIZED PHOTONS - SPECIAL CONSIDERATIONS ON RHO-N-DECAY MODE OF DELTA-(1950) AND DELTA-(2420)

Schildknecht D, SCHREMPP. B. RESONANT PRODUCTION OF VECTOR MESONS BY POLARIZED PHOTONS - SPECIAL CONSIDERATIONS ON RHO-N-DECAY MODE OF DELTA-(1950) AND DELTA-(2420). NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A. 1971;5(1):103-137