# EPS HEP 2015

22-29 July 2015
Europe/Vienna timezone

## Study of fragmentation functions in e+e− annihilation process at Belle

Jul 23, 2015, 4:45 PM
15m
HS32

### Speaker

Marko Bracko (Jozef Stefan Institute)

### Description

The $e^+ e^−$ annihilation process provides an access to the fragmentation functions due to its clean environment. Using the high-statistics dataset accumulated by the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider, we report the first measurements of the double differential cross section of identified di-hadrons (pions and kaons) with respect to the two hadron's fractional energies for any charge and hadron combinations. In addition, we also present an extraction of azimuthal correlation between two pairs of charged pions detected in opposite jets from $e^+ e^−$ annihilation.