[Clas_offline] problem with fastmc

[Daniel Carman]

Folks,

I first verified that the fastMC smearing parameters agree with the latest
version that represents our best knowledge of the forward and central detector
response. With Mauri's help I investigated the code that was used to analyze the
fastMC output and that was where the problem lied. The 4-vector for the scattered
electron contained the generated values. Thus the problem was in the code after
the fastMC code.

Regards,
Daniel

On Nov 8, 2013, at 9:51 AM, Mac Mestayer wrote:

> Hello offliners;
> 
> Dan has discovered what seems to be a serious bug
> in one particular version of fastmc.
> For electroproduction of K+ Lambda, he
> was getting missing mass resolutions too narrow by
> a factor of two.  We think it's because the outgoing
> electron's momentum was not being smeared.
> I gave him a frozen, hard-wired version of
> fastmc (only for the special case of K Lambda) which
> he will investigate.
> 
> Dan and Kijun will look into this and try to figure out
> which version of fastmc is correct and will communicate
> this to people.
> 
> 			- Mac
> 
> "mestayer at jlab.org", (757)-269-7252
> _______________________________________________
> Clas_offline mailing list
> Clas_offline at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas_offline

*********************************************************************************************
*                                                                                                                  *
* Dr. Daniel S. Carman                  e-mail : carman at jlab.org                     *  
* Staff Scientist                              office : (757)-269-5586                         *
* Jefferson Laboratory                   web: http://userweb.jlab.org/~carman  *  
*                                                                                                                  *
*********************************************************************************************

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/clas_offline/attachments/20131108/02b83438/attachment.html