Measurement of eta eta production in two-photon collisions

Details Measurement of eta eta production in two-photon collisions Measurement of eta eta production in two-photon collisions

2010-07-22

arxiv.org/abs/1007.3779v2

Phys.Rev.D82:114031,2010

Physics

High Energy Physics

High Energy Physics - Experiment

26 pages, 18 figures

Scientific paper

10.1103/PhysRevD.82.114031

We report the first measurement of the differential cross section for the process gamma gamma --> eta eta in the kinematic range above the eta eta threshold, 1.096 GeV < W < 3.8 GeV over nearly the entire solid angle range, |cos theta*| <= 0.9 or <= 1.0 depending on W, where W and theta* are the energy and eta scattering angle, respectively, in the gamma gamma center-of-mass system. The results are based on a 393 fb^{-1} data sample collected with the Belle detector at the KEKB e^+ e^- collider. In the W range 1.1-2.0 GeV/c^2 we perform an analysis of resonance amplitudes for various partial waves, and at higher energy we compare the energy and the angular dependences of the cross section with predictions of theoretical models and extract contributions of the chi_{cJ} charmonia.

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