Transverse momentum dependence of the quark helicity distributions and the Cahn effect in double-spin asymmetry ALL in semiinclusive DIS

被引：50

作者：

Anselmino, M.

Efremov, A.

Kotzinian, A.

Parsamyan, B.

机构：

[1] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

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

[4] Univ Turin, Dipartimento Fis Gen, I-10125 Turin, Italy

[5] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

PHYSICAL REVIEW D | 2006年 / 74卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.74.074015

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Within the LO QCD parton model of Semi-Inclusive Deep Inelastic Scattering, center dot N ->center dot hX, with unintegrated quark distribution and fragmentation functions, we study the P-hT dependence of the double longitudinal-spin asymmetry A(LL). We include 1/Q kinematic corrections, which induce an azimuthal modulation of the asymmetry, analogous to the Cahn effect in unpolarized SIDIS. We show that a study of A(LL) and of the weighted DSA A(LL)(h)(cos phi) allows to extract the transverse momentum dependence of the unintegrated helicity distribution function g(1L)(q)(x,k(perpendicular to)) [or Delta q(x,k(perpendicular to))]. Predictions, based on some models for the unknown functions, are given for ongoing COMPASS, HERMES and JLab experiments.

引用

页数：9

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