[Clas12_verystrange] Virtual photon question

[Michael Dugger]

Hi,

I am rather new to virtual photons and have some questions regarding the 
distribution of the virtual photons I should put in the event generator.

The meson proposal has the scattered electron angle from 2.5 to 4.5 
degrees, and the energy of the scattered electron from 0.5 to 4.5 GeV, 
using an incident electron beam energy of 11 GeV.

For the Pythia determined reactions, I simply set the limits of the 
scattered electron, and Pythia figures out the distribution of the virtual 
photons. However, for the predefined Omega- and Xi states I have to create 
the virtual photon distribution, and I am not sure how best to do so.

It is most natural for me to use the above parameters as limits in 
distributing the virtual photons. But need to know what type of 
distribution to use. For example, the most naive way I could distribute 
the virtual photons is to have them arise from scattered electrons that 
are evenly distributed over an energy range of 0.5 to 4.5 GeV and evenly 
in angles from 2.5 to 4.5 degrees. I would like to use the most realistic 
distribution (within reason). Does someone have a suggestion? Also, there 
are several ways the distribution can be parametrized. Is there a 
preferred way that the parametrization should be done?

Thanks for your time.

Sincerely,
Michael