Positivity constraints on photon structure functions
classification
✦ hep-ph
keywords
photonfunctionspositivitystructurecaseconstraintsrealvirtual
read the original abstract
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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