Minutes of the DMWG meeting on Monday, June 11.

>1. What version of GLASTSim should we use, and when will it be ready?

Karl indicates that within a week or two a stable LINUX version of GLASTsim-PDR will be available on the SLAC LINUX farm. This version can be used by all GLAST collaborators, and in particular members of our Dark Matter working group. Karl will keep us up-to-date via email on status.


>2. How do we setup GLASTSim to easily take various files of generated photons.
>(Generate from DarkSUSY plus other inputs.)
>	a) What input variables/photon.
>	b) What's in the output ntuples.
>	c) Who can modify GLASTSim to read/write these files? 
We had a brief continuation of the VRVS meeting among the SLAC members of the working group. Karl indicated that a script could be written that would enable
an easy interface from generator output to GLASTsim input. Elliott suggested that the interface to GLASTsim be an ntuple list of events with each row containing a photon. The ntuple would be more than just the photon four-vector, all that would be needed for GLASTsim, and the additional columns of the ntuple would just be passed through to the output topple file. We also discussed making response matrices from GLASTSIM that could be used to process photons, instead of using GLASTsim directly on the photons generated from the models. This "fast Monte Carlo" would clearly save considerable computer and real time, for only probably small cost in accuracy due to averaging.

 
3. User issues with DarkSUSY.
Eduardo asked questions about Version 2 vs. version 3 of DARKSUSY. Our Italian colleagues were unaware of the release of version 3, and have been working with version 2 plus patches provided by Piero. Aldo speculated that version 3 might be the most recent DARKSUSY release that included all of these patches. The Rome Collaborators believe that version 2 + patches are providing OK results. Eduardo has been having some problems using version 3, and he is sending the input parameters that he has been using to Aldo(?). The Rome folks will then run his input parameter sets and check whether they get good results or not. Aldo will send version 2 patches he obtained from Piero to Eduardo.


>4. Can we redo the WIMP detection limits, from Piero's thesis presented in the >
>GLAST proposal to NASA, by the second week of Snowmass? 

Eduardo asked that we write down exactly what we need. What are the steps and what codes will be used. Karl indicated that a LINUX version of PDR GLAST sim can be done at SLAC, and accessed by all on the LINUX farm. Karl said he would contact Regis to asses progress on the "ultimate" energy resolution algorithms for the calorimeter that Regis is working on. This may take longer than a week or two for Regis to complete, and so we may want to use the same technique we used for the response to the GLAST AO, i.e., Particle data booklet shower leakage correction. Eduardo volunteered that SLAC could provide energy response matrices, exposure and relative exposure maps to Rome, and then Rome could run the various DARKSUSY models + diffuse background (Lars and Piero are in the same time zone). We then would need to fit for the spectral structures to get 95% CL upper limits. 

>5. AOB
No new business

After the full meeting, we continued for 1/2 hour among the SLAC participants. We considered PDR GLASTsim mods for DarkMatter search uses. No definite plan was decided. We need further information on the nature of the PDR release from the offline software group. Karl and Eduardo are trying to gather more information for discussions we are planning for the SLAC Particle Astro group meeting on Tuesday afternoon.



_________________________________________
Elliott D. Bloom                    Voice: 650-926-2469  
Particle Astro Physics            FAX: 650-926-4335
SLAC, Stanford University