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KS0KS0 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 |cosθ∗|<0.6. Combining the results with measurements of γγ→K+K− from Belle, we observe that the...
The production of the χ c2 charmonium state in two-photon collisions has been measured with the Belle detector at the KEKB e + e − collider. A clear signal for χ c2 → γJ/ψ, J/ψ → ℓ + ℓ − is observed in a 32.6 fb −1 data sample accumulated at center-of-mass energies near 10.6 GeV, and the product of its two-photon decay width and branching fraction...
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