> Hi, I'm very interested in participating with this GSIM Focus
> Group which is being formed.
That's great!
> I am currently working with the CELEG Event
> Generator to try to make sure it works properly for photon running; I already
> was able to fix one problem which was producing incorrect kinematics.
I hope you checked your changes in so that others will benefit from your work?
> Our
> next step is to try to calculate acceptances using GSIM, so I would be very
> interested in helping this work along. I am offsite in Washington, DC, but
> would certainly be able to attend some of the meetings; when is the first
> meeting supposed to be held?
The first meeting was held Friday, March 13 at 11:00 am ( I hadn't read yournote
yet, sorry). You should join the clas_gsim mailing list if you're not already
a member.
As I mentioned in the mail messages, you don't have to be physically here to
participate in the meetings. It is easy to call you in a conference call, and it
may
be easy to use the web-based whiteboard, depending on what browsers you have
access to. For outside users, these features are cost-free, by the way.
> One problem I'm running into is how to pass the photon energy along through
> the BOS banks from the event generator to the final analysis. I didn't
> seeanything obviously in the BOS banks which is used to pass this or q or w
> along,do you have any idea how people have passed any of these variables from
> event generator to final analysis to calculate acceptances in terms of these
> variables? Would a new BOS bank need to be created containing these variables?
For electron scattering, people pass the information via MCVX and MCTK banks.
Then q or w are calculated from the information in these banks. If the photon is
not in your MCVX and MCTK bank (because it's not in the final state, as the
electron is), I think there is not a mechanism to keep track of these quantities
at the moment. You could post this question to the clas_gsim and class_offline
mailing list. I'll post it to clas_gsim further comments.
I think we may want to add at least one more BOS bank for stuff like this, and
probably
more. If you start thinking about PWA, it might be nice to have partial wave
information
in an initial bos bank also. We don't have this either. The bank in which you'd
put your
photon quantities might have wider applicability than just for tagger work. It
could be an 'auxilliary particles' bank, which could be used for other purposes as
well.
> I'm not exactly sure what the percentage of my time commitment would be to the
> project, what with shifts and hopefully working on data analysis when
> available, but at this point I'm certainly devoting a lot of effort to
> gsim related activities. -Bryan Carnahan
That's great! I hope you will be able to come to our meetings and work on some
of the critical projects.