Future Measurements of Spin Dependent Fragmentation Functions in e+e- Annihilation at Belle

摘要

In unpolarized electron-positron annihilation, there may exist interesting and possibly non-zero azimuthal asymmetries, which measure novel chiral-odd fragmentation functions, such as the Collins-Heppelmann function, H_1~⊥, and the two-pion interference fragmentation function, δq~h. We will present the experimental method to extract these functions using e~+e~- collision data from the Belle experiment at KEK B-factory (KEKB). In addition to the considerable interest in the properties of these new fragmentation functions, they are expected to be a powerful tool in accessing proton quark transversity distributions.