Measurement of the gamma gamma --> pi+ pi- and gamma gamma --> K+ K- processes at energies of 2.4-GeV - 4.1-GeV.

The Belle collaboration
Phys.Lett.B 615 (2005) 39-49, 2005.

Abstract (data abstract)
KEK-KEKB Collider. Measurement of the cross sections for PI+ PI- and K+ K- production in two-photon interactions produced in the collisions of 8 GeV electrons with 3.5 GeV positrons. The data which has an integrated luminosity of 87.7 fb-1 cover the two-photon centre of mass (W) range 2.4 to 4.1 GeV in angular regions ABS(COS(THETA)) < 0.6 UPDATE (17 JUN 2015): added Tables 3-6 with angular dependence of cross sections provided by H. Nakazawa.

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