[Clas12_verystrange] Virtual photon question (fwd)

[Michael Dugger]

---------- Forwarded message ----------
Date: Thu, 25 Aug 2011 21:59:03 +0800
From: Carlos Salgado <salgado at jlab.org>
To: Michael Dugger <dugger at jlab.org>
Cc: clas12_verystrange at jlab.org
Subject: Re: [Clas12_verystrange] Virtual photon question

Michael

I am attaching a short note I wrote sometime ago and virtual photon energy distributions.
You can also talk to Derek to get his code perhaps more modern.
See you Carlos
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On Aug 25, 2011, at 7:46 AM, Michael Dugger wrote:

> 
> 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
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