High-statistics study of K^0_S pair production in two-photon collisions

Understand

We report a high-statistics measurement of the differential cross section of the process gamma gamma --> K^0_S K^0_S in the range 1.05 GeV <= W <= 4.00 GeV, where W is the center-of-mass energy of the colliding photons, using 972 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider operated at and near the Upsilon-resonance region.

• The differential cross section is fitted by parameterized S-, D_0-, D_2-, G_0- and G_2-wave amplitudes.
• In the D_2 wave, the f_2(1270), a_2(1320) and f_2'(1525) are dominant and a resonance, the f_2(2200), is also present.
• The f_0(1710) and possibly the f_0(2500) are seen in the S wave.