[Clas12_verystrange] Event generator comments and questions

[Igor Strakovsky]

Mike,

Let me try to answer some of your questions...

On Thu, 25 Aug 2011 21:02:13 -0400 (EDT), Michael Dugger <dugger at jlab.org> 
wrote:

> 
> Hi,
> 
> The code that Derek sent me was missing some files and because of the time 
> difference between Derek and I, I decided to code the virtual photon 
> distribution as show in the note that Carlos sent.
> 
> The distributions I obtain look very similar to what Carlo has in his note. 
>If 
> interested, I have some plots on the web showing the virtual 
> photon distribution:
> 
> http://www.jlab.org/Hall-B/secure/clas12/omegaMinus/ASU/QsqVsNu.gif
> -> Q^2 versus e1-e2
> 
> http://www.jlab.org/Hall-B/secure/clas12/omegaMinus/ASU/Qsq.gif
> -> Counts versus Q^2
> 
> http://www.jlab.org/Hall-B/secure/clas12/omegaMinus/ASU/nu.gif
> -> e1-e2
> 
> where e1 = initial electron energy, and e2 = scattered electron energy.
> 
> If there is any reason I should use Derek's code for the virtual photon 
> distribution instead of what is currently in place, please let me know.
> 
> vsGen now includes cross section weights for the gamma p -> p X reaction, 
> where 
> the weights are equal to the total cross section. I also have total cross 
> section weights for the ground state cascades. The code that generates 
> cascade cross sections were given to me by Kanzo Nakayama.
> 
> Questions:
> * Does anyone know where I can get estimated cross sections for the higher 
> mass cascades?

Not yet.  Winston is do some calculations for higher cascades.  It is possible 
that we will have some estimations in a month or two

> * Is there estimates for the Omega- cross section?

Try to use what Kanzo code does but reduce Xsection by a factor of 10.
See our LoI for that

Igor

> * I remember from the meeting that I should generate 1/eGamma dependence for 
> real photons, and that I need to check in the code to the svn repository. Is 
> there anything else I should do?
> 
> I expect that some time next week I will start becoming busy with another 
> project and I want to get as much done to the generator as I can before I 
> have to concentrate my efforts on other things.
> 
> Thanks for your time.
> 
> Take care,
> Michael
> 
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Igor Strakovsky, SAID CNS The George Washington University
Tel: 703-726-8344(NV),202-994-4742(FB),Skype: igors1945_2
Fax: 202-994-3001(FB),Emails: igor at va.gwu.edu, igor at jlab.org