Scale Dependence of Polarized DIS Asymmetries

Abstract

We compare the $Q^2$ dependence of the polarized deep inelastic scattering proton asymmetry, driven by the leading order Altarelli Parisi evolution equations, to those arising from fixed order ${\alpha }_s$ and ${\alpha }_s^2$ approximations. It is shown that the evolution effects associated with gluons, which are not properly taken into account by the leading order approximation, cannot be neglected in the analysis of the most recent experimental data.

Latex file, (9 figures in postcript available from [email protected])

References in corpus (7)

• The theory and phenomenology of polarized deep inelastic scattering
• Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
• Spin-dependent Parton Distributions from Polarized Structure Function Data
• On the Q^2 Dependence of Measured Polarized Structure Funtions
• Scale Dependence and Small-x Behaviour of Polarized Parton Distributions
• $\mathcal{O}({\alpha }_s)$ Spin-Dependent Weak Structure Functions
• Polarised parton distributions

Cited by in corpus (2)

• Factorization in Semi-Inclusive Polarized Deep Inelastic Scattering
• Next to Leading Order Semi-inclusive Spin Asymmetries