QCD predictions for spin dependent photonic structure function $g_1^γ(x,Q^2)$ in the low x region of future linear colliders

Details QCD predictions for spin dependent photonic structure function $g_1^γ(x,Q^2)$ in the low x region of future linear colliders QCD predictions for spin dependent photonic structure function $g_1^γ(x,Q^2)$ in the low x region of future linear colliders

2000-06-26

arxiv.org/abs/hep-ph/0006292v2

Phys.Rev. D63 (2001) 054022

Physics

High Energy Physics

High Energy Physics - Phenomenology

revised version, 19 pages, latex, 8 figures. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.63.054022

Spin dependent structure function $g_1^{\gamma}(x,Q^2)$ of the polarised photon is analysed within the formalism based upon the unintegrated spin dependent parton distributions incorporating the LO Altarelli-Parisi evolution and the double $ln^2(1/x)$ resummation at low values of Bjorken parameter x. We analyse the effects of the double $ln^2(1/x)$ resummation on the behaviour of $g_1^{\gamma}(x,Q^2)$ in the low x region which may be accessible in future linear $e^+e^-$ and $e\gamma$ colliders. Sensitivity of the predictions on the possible nonperturbative gluon content of the polarised photons is analysed. Predictions for spin dependent gluon distribution $\Delta g^{\gamma} (x,Q^2)$ are also given.

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