Hi all. I'm studying deep inelastic cross section in parton model. In particular I'm referring to Halzen-Martin's "Quarks and leptons" section 8.5, but I think this is a quite generale procedure.(adsbygoogle = window.adsbygoogle || []).push({});

In studying the deep inelastic scattering by e- on proton it cuts off the electron part and work only on the virtual photon-proton part.

In doing so it's found out that the flux term is dependent on the photon virtuality by the relation:

$$4\sqrt{{(p_ap_b)}^2-m_a^2m_b^2}=4M\sqrt{K^2-q^2}$$

where K is the photon flux (unknow because of the virtuality), q is the photon quadri-momentum and M is the proton mass.

Now, it chooses the flux factor to satisfy theHand convention:

$$K=\nu + \frac{q^2}{2M}$$

This choise is made in order to threat the photon as in the real case. But why we have such a freedom in defining the flux factor??

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# Deep inelastic scattering: quention on the Hand convention for the flux.

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