Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-09-24
Phys.Lett.B651:15-21,2007
Physics
High Energy Physics
High Energy Physics - Experiment
15 pages, 5 figures, published in PLB 651, 15 (2007)
Scientific paper
10.1016/j.physletb.2007.05.059
$K^0_SK^0_S$ 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 $|\cos\theta^*|<0.6$. Combining the results with measurements of $\gamma\gamma\to K^+K^-$ from Belle, we observe that the cross section ratio $\sigma(K^0_SK^0_S)/\sigma(K^+K^-)$ decreases from ~0.13 to ~0.01 with increasing energy. Signals for the $\chi_{c0}$ and $\chi_{c2}$ charmonium states are also observed.
Chen Wan-Ting
for the Belle Collaboration
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