[Clas12_verystrange] dry run comments

Lei Guo lguo at jlab.org
Fri May 25 15:44:36 EDT 2012


Hi, Strangers,

The dry run was very useful. I need to work on the organization of the  
slides to better make our case.

A couple of specific comments are very important.
1. Volker said it would not look very good simply asking for 80 beam  
days because that's what the meson experiment got approved for. I  
think we can justify the beam time from the omega- differential cross  
sections. For example, if we want to at least be able to tell the  
forward-backward behavior of the Omega- in c.m. frame, we need have  
certain maximum allowable statistical uncertainty. Say, we bin our  
results in at least 5 (or more) angle bins, and 5 energy bins, how  
does the statistical uncertainty (Or the difference between the  
forward/backward bins) change as a function of beam time. Any other  
suggestions?
2. Magnetic field setting. It was mentioned at the dry run that the  
meson people might want to run it at full field. Maybe Derek can  
confirm that? In any case, we might want to have a set of table of  
expected rates based on the full field simulation.
3. The expected results for Xi- polarization measurement (I think we  
already have the  projected numbers, just need to obtain the proper  
uncertainty) -- and the xi(1820) double moments-- both are missing.

Please let me know if you have any more comments and suggestions. I  
will have the proposal at our svn depository whenever it is updated. I  
shall have another version next week (I will be at JLAB)

Lei
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