Chiral-odd fragmentation functions in single pion inclusive electroproduction

We consider a sub-leading twist chiral-odd pion fragmentation function and explore its contribution in single pion semi-inclusive electroproduction. We evaluate the single beam-spin azimuthal asymmetry ALU and the double spin asymmetry ALT in polarized electroproduction of pions from an unpolarized and transversely polarized nucleon, respectively. The beam asymmetry is expressed as the product of chiral-odd, and T-odd and even distribution and fragmentation functions. The double spin asymmetry contains information on the quark's transversity distribution. In a quark–diquark–spectator framework we estimate these asymmetries at 6 GeV, 12 GeV, and 27.5 GeV energies.