Invariant-mass and fractional-energy dependence of inclusive production of dihadrons in e + e ? annihilation at ?s = 10.58 GeV

Abstract

The inclusive cross sections for dihadrons of charged pions and kaons (e+e? ? hhX) 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?1 data sample collected at or near the ?�4S� resonance with the Belle detector at the KEKB asymmetric-energy e�e? collider. � 2017 American Physical Society.