Speaker
Description
Spontaneous hyperon polarization has been a long standing issue for about 40 years. The so called polarizing Fragmentation Function(FF), D⊥ 1T(z, p2⊥), describes the production of a transversely polarized hadron from an unpolarized quark, where z denotes the fractional energy of the hadron and p⊥ the transverse momentum with respect to the fragmenting quark. The polarizing FF can be determined by measurement of the transverse polarization of hyperons. Because of the chiral-even nature, the polarizing FF sign is possible to be unambiguously measured. It provides a unique opportunity to test the universality of the FFs. The large e+e− annihilation data sample collected by the Belle experiment at the KEKB storage ring allows a precision study of the production of transversely polarized hyperons and check our current understanding of the associated QCD dynamics. The status of the analysis on the transverse polarization of Λ(Λ) in the ¯ inclusive production in e+e annihilation at Belle will be presented for both cases of with and without a light hadron to tag the flavor of the quark fragmenting to the Λ(Λ).
