Transverse momentum dependence of the quark helicity distributions and the Cahn effect in double-spin asymmetry $A_{LL}$ in Semi Inclusive DIS

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dc.creatorAnselmino, M.
dc.creatorEfremov, A.
dc.creatorKotzinian, A.
dc.creatorParsamyan, B.
dc.date2006-08-04
dc.date2006-11-02
dc.date.accessioned2026-07-07T11:05:24Z
dc.date.available2026-07-07T11:05:24Z
dc.descriptionWithin the LO QCD parton model of Semi Inclusive Deep Inelastic Scattering, $\ell N \to \ell h X$, with unintegrated quark distribution and fragmentation functions, we study the $\bfP_{hT}$ 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 $A_{LL}^{\cosϕ_h}$ allows to extract the transverse momentum dependence of the unintegrated helicity distribution function $g_{1L}^q(x,k_\perp)$ [or $Δq(x, k_\perp)]$. Predictions, based on some models for the unknown functions, are given for ongoing COMPASS, HERMES and JLab experiments.
dc.descriptionReplaced with published in PHYSICAL REVIEW D 74, 074015 (2006) version
dc.identifierhttps://arxiv.org/abs/hep-ph/0608048
dc.identifierhttp://arxiv.org/abs/hep-ph/0608048
dc.identifierPhys.Rev.D74:074015,2006
dc.identifierdoi:10.1103/PhysRevD.74.074015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189196
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleTransverse momentum dependence of the quark helicity distributions and the Cahn effect in double-spin asymmetry $A_{LL}$ in Semi Inclusive DIS
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