On the T-odd Quark Fragmentation Function and on Transversal Handedness

The first probe of the correlation of the T-odd one-particle fragmentation function responsible for the left–right asymmetry of fragmentation of a transversely polarized quark is done by using the 1991-95 DELPHI data for Z → 2-jet decay. Integrated over the fraction of longitudinal and transversal momenta, this correlation is of 1.5% order, which means order of 13% for the analyzing power. A rather large (≈ 10%) handedness transversal to the production plane was observed in the diffractive production of (πππ) triples from nuclei by the 40GeV/c π–beam. It was shown that the phenomenon has a clear dynamic origin and resembles the single spin asymmetry behavior. All this makes us hope to use this effects in polarized DIS experiments for transversity measurement.