Azimuthal asymmetry in electro-production of neutral pions in SIDIS

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dc.creatorEfremov, A. V.
dc.creatorGoeke, K.
dc.creatorSchweitzer, P.
dc.date2001-08-25
dc.date2001-09-27
dc.date.accessioned2026-07-07T10:52:23Z
dc.date.available2026-07-07T10:52:23Z
dc.descriptionRecently 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.
dc.description12 pages, 10 figures. Fig.3c, Fig.4a updated, conclusions added
dc.identifierhttps://arxiv.org/abs/hep-ph/0108213
dc.identifierhttp://arxiv.org/abs/hep-ph/0108213
dc.identifierPhys.Lett.B522:37-48,2001; Erratum-ibid.B544:389-392,2002
dc.identifierdoi:10.1016/S0370-2693(01)01258-8
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/185142
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAzimuthal asymmetry in electro-production of neutral pions in SIDIS
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