Phenomenological determination of polarized quark distributions in the nucleon

Abstract

We present a fit to spin asymmetries which gives polarized quark distributions. These functions are closely related to the ones given by the newest Martin, Roberts and Stirling fit for unpolarized structure functions. The integrals of polarized distributions are discussed and compared with the corresponding quantities obtained from neutron and hyperon $\beta$-decay data. We use the combination of proton and neutron spin asymmetries in order to determine the coefficients of our polarized quark distributions. Our fit shows that phenomenologically there is no need for taking gluonic degrees of freedom into account.

11 pages, latex, +6 postscript figures appended

References in corpus (6)

• Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
• QCD Constrains on the Shape of Polarized Quark and Gluon Distributions
• Consistent Analysis of the Spin Content of the Nucleon
• The next-to-leading QCD approximation to the Ellis-Jaffe sum rule
• On the Q^2 Dependence of Measured Polarized Structure Funtions
• PHENOMENOLOGICAL APPROACH TO UNPOLARIZED AND POLARIZED PARTON DISTRIBUTIONS AND EXPERIMENTAL TESTS

Cited by in corpus (1)

• Unified description of the non-singlet spin dependent structure function $g_1$ incorporating Altarelli-Parisi evolution and the double logarithmic $l{n}^2(1/x)$ effects at low $x$