Status on the transversity parton distribution: the dihadron fragmentation functions way

Abstract

We report on the extraction of dihadron fragmentation functions (DiFF) from the semiinclusive production of two hadron pairs in back-to-back jets in e+e- annihilation. A nonzero asymmetry in the correlation of azimuthal orientations of opposite ${\pi }^{+}{\pi }^{-}$ pairs is related to the transverse polarization of fragmenting quarks through a significant polarized DiFF. A combined analysis of this asymmetry and the spin asymmetry in the SIDIS process $e{p}^{\uparrow }\to e^{\prime }({\pi }^{+}{\pi }^{-})X$ has led to the first extraction of the u and d-flavor transversity parton distribution function in the framework of collinear factorization.

Comments: To appear in the proceedings of the XX International Workshop on Deep-Inelastic Scattering, Bonn, Germany, March 26-30, 2012 and of the Sixth International Conference on Quarks and Nuclear Physics, Palaiseau, France, April 16-20, 2012. Contain DISproc.cls and .bst