Azimuthal asymmetry in electro-production of neutral pions in semi-inclusive DIS

被引：67

作者：

Efremov, AV

Goeke, K

Schweitzer, P ^{[1
]}

机构：

[1] Joint Inst Nucl Res, Dubna 141980, Russia

[2] Ruhr Univ Bochum, Inst Theoret Phys 2, D-4630 Bochum, Germany

来源：

PHYSICS LETTERS B | 2001年 / 522卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(01)01258-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently HERMES has observed an azimuthal asymmetry A(UL) 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 h(l)(a) in the effective chiral quark-soliton model combined with experimental DELPHI-data on the new T-odd Collins fragmentation function H-l(perpendicular to). There are no free, adjustable parameters in the analysis. Using the z(h)-dependence of the HERMES azimuthal asymmetry and the calculated transversity distributions the z(h)-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. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：37 / 48

页数：12

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