Invariant-mass and fractional-energy dependence of inclusive production of dihadrons in annihilation at 10.58 GeV

Seidl, R.*; Tanida, Kiyoshi   ; Belle Collaboration*; 161 of others*

The inclusive cross sections for dihadrons of charged pions and kaons () in electron-positron annihilation are reported. They are obtained as a function of the total fractional energy and invariant mass for any di-hadron combination in the same hemisphere as defined by the thrust event-shape variable and its axis. Since same-hemisphere dihadrons can be assumed to originate predominantly from the same initial parton, di-hadron fragmentation functions are probed. These di-hadron fragmentation functions are needed as an unpolarized baseline in order to quantitatively understand related spin-dependent measurements in other processes and to apply them to the extraction of quark transversity distribution functions in the nucleon. The di-hadron cross sections are obtained from a 655 fb data sample collected at or near the resonance with the Belle detector at the KEKB asymmetric-energy collider.