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

The 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.

• #### Table 1

Data from T 1,F 5

10.17182/hepdata.68395.v1/t1

Cross sections for PI+ PI- and K+ K- production.

• #### Table 2

Data from P 15 (C=PREPRINT)

10.17182/hepdata.68395.v1/t2

Ratio of K+ K- to PI+ PI- production in the region of W from 3.0 to 4.1 GeV, where the...

• #### Table 3

Data from F 4

10.17182/hepdata.68395.v1/t3

Angular dependence of the normalized differential cross section, $\sigma_0^{-1}{\rm d}\sigma/{\rm d}|\cos\theta^*|$, for the $\pi^+\pi^-$ process. The errors are statistical only.

• #### Table 4

Data from F 4

10.17182/hepdata.68395.v1/t4

Angular dependence of the normalized differential cross section, $\sigma_0^{-1}{\rm d}\sigma/{\rm d}|\cos\theta^*|$, for the $K^+K^-$ process. The errors are statistical only.

• #### Table 5

Data from F 4

10.17182/hepdata.68395.v1/t5

Angular dependence of the differential cross section, ${\rm d}\sigma/{\rm d}|\cos\theta^*|$, for the $\pi^+\pi^-$ process. The errors are statistical only.

• #### Table 6

Data from F 4

10.17182/hepdata.68395.v1/t6

Angular dependence of the differential cross section, ${\rm d}\sigma/{\rm d}|\cos\theta^*|$, for the $K^+K^-$ process. The errors are statistical only.