I'd like to respond to the previous message.
Will Brooks wrote:
> 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 don't know exactly how the photon energy is dealt with in RECSIS (ie. code
implementation details). One thing to note is that GSIM does not destroy any
existing banks. If you have an input file that besides the GSIM banks
contains other banks with other information, those banks will be the same in
the output file. Thus, if there is already a bank that has the photon like
the TAGR bank, this bank can be filled by your generator, and it will get
passed along. If you turn off the TAGGER code in RECSIS it won't overwrite
your bank, and the analysis of this output can follow the same path as the
analysis of photon data.
Eric Anciant (mailto:anciant@phnx7.saclay.cea.fr), and Carlos Salgado
(mailto:salgado@cebaf.gov) have already put a lot of work into the tagger
simulation code. The best thing to do would be to find out from them what
your generator needs to do to work together with their code.
Something to note:
GSIM will also take it's input information from the PART bank, if this bank
exist. The idea is that the PART bank, which is an output bank from RECSIS,
can be fed back into GSIM. If we need a little more information some it
might go there. I would ask Dennis about what he sees is a good set of banks
to deal with PWA. I think he has already done PWA on CLAS data, so I am not
so sure if it is a good idea to jump ahead and start defining new/more PWA
banks.
> 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.
>
-- Maurik
----------------------------------------------------------------------
Maurik Holtrop web: http://www.physics.unh.edu/Maurik
UNH Physics Department tel: (603) 862-2019 | fax: (603) 862-2998
DeMeritt Hall email: maurik.holtrop@unh.edu
Durham, NH 03824 Home: (603) 659-8765
----------------------------------------------------------------------