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We present measurements of Collins asymmetries in the inclusive process e+e--->pi pi X, where pi stands for charged pions, at a center-of-mass energy of10.6 GeV. We use a data sample of 468 fb-1 collected by the BABAR experiment atthe PEP-II B factory at SLAC, and consider pairs of charged pions produced inopposite hemispheres of hadronic events. We observe clear asymmetries in thedistributions of the azimuthal angles in two distinct reference frames. Westudy the dependence of the asymmetry on several kinematic variables, findingthat it increases with increasing pion momentum and momentum transverse to theanalysis axis, and with increasing angle between the thrust and beam axis.

Measurement of Collins asymmetries in inclusive production of charged pion pairs in e^+e^- annihilation at BABAR