[Clas12_verystrange] dry run comments

[Derek Glazier]

Hi Lei,
   With respect to point 2, the meson proposal would prefer the half 
field because it also increases the acceptance for multipion final 
states. The proposal also showed that we could take data with the higher 
field as it is mostly the lower meson mass where the acceptance is lost. 
For the Omega- measurement with the full field you lose around a factor 
8 events, when detecting the 4Kaons; for the 3Kaons it is just a factor 2.
One factor that has not been considered is the effect on the  particle 
ID of the lower field.
Cheers
Derek

On 05/25/12 20:44, Lei Guo wrote:
> 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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