# ICHEP2012

Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

## Study of QCD in gamma gamma to pseudoscalar meson pair processes

Jul 7, 2012, 5:15 PM
15m
Room 217 (Melbourne Convention and Exhibition Centre)

### Room 217

#### Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 6. QCD, Jets, Parton Distributions

### Speaker

Dr Hideyuki Nakazawa (National Central University (JP))

### Description

We report QCD studies of pseudoscalar meson pair production in two-photon collisions at the Belle experiment. Differential cross sections have been measured for $\pi^+ \pi^-$, $\pi^0 \pi^0$, $K^+ K^-$, $K_S K_S$, $\eta \pi^0$ and $\eta \eta$ final states. Their $W$ dependence and angular distributions are compared with perturbative and non-perturbative QCD predictions at $(2.4-3.1)\ {\rm GeV} < W < (3.3-4.1)\ {\rm GeV}$, where $W$ is the invariant mass of the two-photon system. Existing predictions fail systematically to describe our measurements.

### Primary author

Dr Hideyuki Nakazawa (National Central University (JP))

 Slides