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arxiv: hep-ph/0110014 · v2 · submitted 2001-09-30 · ✦ hep-ph

Positivity constraints on photon structure functions

classification ✦ hep-ph
keywords photonfunctionspositivitystructurecaseconstraintsrealvirtual
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We investigate the positivity constraints for the structure functions of both virtual and real photon. From the Cauchy-Schwarz inequality we derive three positivity conditions for the general virtual photon case, which reduce, in the real photon case, to one condition relating the polarized and unpolarized structure functions.

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