A study of gamma gamma -> Ks Ks production at energies of 2.4-4.0GeV at Belle

Abstract

$K_S^0{K}_S^0$ production in two-photon collisions has been studied using a 397.6 fb${}^{-1}$ data sample collected with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. For the first time the cross sections are measured in the two-photon center-of-mass energy range between 2.4 GeV and 4.0 GeV and angular range $|\cos {\theta }^{\ast }|<0.6$. Combining the results with measurements of $\gamma \gamma \to K^{+}{K}^{-}$ from Belle, we observe that the cross section ratio $\sigma (K_S^0{K}_S^0)/\sigma (K^{+}{K}^{-})$ decreases from ~0.13 to ~0.01 with increasing energy. Signals for the ${\chi }_{c0}$ and ${\chi }_{c2}$ charmonium states are also observed.

15 pages, 5 figures, published in PLB 651, 15 (2007)

References in corpus (3)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• gamma+gamma --> pi+pi, K+K : leading term QCD vs handbag model

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