[G12] Multiple Photon Efficiency correction

[Volker Crede]

Dear Michael,

Can you elaborate on why new track efficiency corrections for events with multiple photons should affect Zulkaida's ω cross section? I would like to understand the connection and what has actually "improved" … 

- Volker


On Nov 3, 2015, at 11:01 AM, Michael C. Kunkel <mkunkel at jlab.org> wrote:

> Greetings,
> 
> I have finished the track efficiency corrections for events with multiple photons. I will present this at the next meeting.
> Over all, it seems the new corrections decrease the spectrum by 5%, which was what Lei and I had originally calculated.
> 
> I would ask Zulkaida to please use these new corrections for his omega Xsection and compare to g11, I think the agreement will be better now.
> 
> https://jlabsvn.jlab.org/svnroot/clas/users/mkunkel/clas/g12_corrections/All_Corrections/
> 
> or
> 
> https://github.com/mckunkel/G12_Corrections
> 
> use:
> 
>    double g12_trackEfficiency(double Vz, double P_Ptot_fit, double P_Phi_fit, double P_Theta_fit, double Ep_Ptot_fit,double Ep_Phi_fit, double Ep_Theta_fit, double Em_Ptot_fit, double Em_Phi_fit, double Em_Theta_fit, TString DEG_or_RAD, bool MultPhoton){
> 
> Set MultPhoton = 1 for multiple photon track efficiency
> 
> -- 
> BR
> MK
> ----------------------------------------
> Michael C. Kunkel, PhD
> Forschungszentrum Jülich
> Nuclear Physics Institute and Juelich Center for Hadron Physics
> Experimental Hadron Structure (IKP-1)
> www.fz-juelich.de/ikp
> 
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