PNNL

Abstract

We report the first double differential cross sections of two charged pions and kaons (e+e- ->hhX) in electron-positron annihilation as a function of the fractional energies of the two hadrons for any charge and hadron combination. The dependence of these di-hadron cross sections on the topology (same, opposite-hemisphere or anywhere) is also studied with the help of the event shape variable combinations directly shed light on the contributing fragmentation functions. For example, we find energies where disfavored fragmentation is expected to be suppressed. These di-hadron results are the KEKB asymmetric-energy e+e- collider. Extending the previously published single-pion and single-kaon cross sections, single-proton (e+e- -> pX) cross sections are extracted from a 159 fb^-1 data sub-sample.