The Spin Structure of a Polarized Photon
Steven D. Bass, Stanley J. Brodsky, Ivan Schmidt
Abstract
We show that the first moment of the spin-dependent structure function g1γ(x,Q2) of a real photon vanishes independent of the momentum transfer Q2 it is probed with. This result is non-perturbative: it holds to all orders in perturbation theory in abelian and non-abelian gauge theory and at every twist.
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