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Azimuthal asymmetry in electro-production of neutral pions in SIDIS | | A.V. Efremov
; K. Goeke
; P. Schweitzer
; | | Date: |
25 Aug 2001 | | Journal: | Phys.Lett. B522 (2001) 37-48; Erratum-ibid. B544 (2002) 389-392 | | Subject: | hep-ph | | Affiliation: | Dubna, JINR), K. Goeke, P. Schweitzer (Ruhr U., Bochum | | Abstract: | 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. | | Source: | arXiv, hep-ph/0108213 | | Services: | Forum | Review | PDF | Favorites | |
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