[Clas12_software] CLAS12 fastmc

[burkert]

Mohammad,

  I was wondering if you did get the latest version of the FASTMC?

  As we discussed when I was at Argonne the distortions come from the 
fact that you plot the phi angle in the vertex frame. I guess even a 
more recent version of FASTMC will give a similar distortion, as it is 
the result of the solenoid field bending the electrons in phi and with 
increasing polar angle and lower momentum the effect will be increasing. 
So, electrons entering one given sector have started at different phi 
angles at the vertex. In order to eliminate the effect you need to plot 
against the phi angle at the first layer of DC region 1 as the 
integrated solenoid field is nearly zero there.
I am not sure the FASTMC allows you to do it, but once you use the full 
reconstruction then the coordinate in DC layer 1 region 1 (dc1)  should 
be computed and phi_dc1 calculated.

I hope that helps,
Volker






On 11/11/15 12:57 PM, hattawy at jlab.org wrote:
> Dear All,
>      I am using a relatively old version of CLAS12 fastmc which gives me a
> huge deflection in the azimulthal angles for the electrons at polar
> angles greater than 15 deg (see attached plot for the DVCS electrons
> using beam energy of 11 GeV).
>      Can you please direct me where I can find  the latest or a tested
> version of CLAS12 fastmc. Thanks in advance for the help.
>
> Best regards,
> Mohammad Hattawy.
>
>
> This body part will be downloaded on demand.

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