Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-06-29
Z.Phys. C70 (1996) 637-654
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 34 pages, 6 figures (in Postscript file)
Scientific paper
We present the calculation of the two-loop spin splitting functions $P_{ij}^{(1)}(x)\; (i,j = q,g)$ contributing to the next-to-leading order corrected spin structure function $g_1(x,Q^2)$. These splitting functions, which are presented in the \MSbs, are derived from the order $\alpha_s^2$ contribution to the anomalous dimensions $\gamma_{ij}^{m} \; (i,j = q,g)$. The latter correspond to the local operators which appear in the operator product expansion of two electromagnetic currents. Some of the properties of the anomalous dimensions will be discussed. In particular we find that in order $\alpha_s^2$ the supersymmetric relation $\gamma_{qq}^{m}+\gamma_{gq}^{m}-\gamma_{qg}^{m}-\gamma_{gg}^{m}=0$ is violated.
Mertig R.
van Neerven W. L.
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