Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-08-25
Phys.Lett.B522:37-48,2001; Erratum-ibid.B544:389-392,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 10 figures. Fig.3c, Fig.4a updated, conclusions added
Scientific paper
10.1016/S0370-2693(01)01258-8
Recently HERMES has observed an azimuthal asymmetry in electro-production of neutral pions in semi-inclusive deep-inelastic scattering of unpolarized positrons off longitudinally polarized protons. This asymmetry (like those observed in the production of charged pions) is well reproduced theoretically by using the non-perturbative calculation of the proton transversity distribution in the effective chiral quark-soliton model combined with experimental DELPHI-data on the new T-odd Collins fragmentation function. There are no free, adjustable parameters in the analysis. Using the $z$-dependence of the HERMES azimuthal asymmetry and the calculated transversity distributions the z-dependence of the Collins fragmentation function is obtained. The value obtained from HERMES data is consistent with the DELPHI result, even though these results refer to different scales.
Efremov A. V.
Goeke Klaus
Schweitzer Pascal
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