[G12] pass1 cooking

[Eugene Pasyuk]

Gagik,

I think more conclusive test would be to check for omegas without 
0.44<M(pi+pi-)<0.54 cut.
What's the reason to have it on the first place if you look for omega?

-Eugene

Gagik Gavalian wrote:
> Dear All,
>
> As I mentioned at the meeting I have some concerns about the pass1 
> cooking, at this point it's a concern so it will be nice if someone 
> could double check this !
> So, I selected events from pass0 cooked files with final state "pi+pi- 
> proton", and required
> missing mass of (pi+pi-proton) to be 0 < MM(pi+pi-p)<0.28, since I 
> preskimmed this sample there is an implicit cut on invariant mass of 
> pi+pi-, and it is, 0.44<M(pi+pi-)<0.54, and when I plot the missing 
> mass of proton with above described cuts from pass 0 I get a nice peak 
> for omega.
> I selected omega events (shown on figure pass0_pipip.pdf, see 
> attachment), the event numbers are in the attachment (eventsOmega.evt) 
> and all the events are from two files run_57276.A40 and run_57276.A43.
>
> Then
> I printed out the content of EVNT bank and PART bank (it's called GSIM 
> in the printout, it's really the content of PART(1) bank) for both 
> pass0 and pass1 (though pass0 does not have PART(1) bank in the skim 
> so it's printout is empty). Though I'm cooking those same files now 
> using calibration constants for pass0, I'll probably have full info on 
> it then.
>
> But, meanwhile, I also run my analysis code on the same files from 
> pass one cooking,  and the result is in the attachment (file: 
> pass1_pipip.pdf).
>
> I'm now a little concerned that it might be due to my analysis code 
> that I miss those omega events in the pass1, could someone please 
> check with their own analysis code the files from pass one for omega 
> events.
> Here are the details:
> The files are located at Jlab:
> /w/hallb/clasg12/gavalian/g12Pass1Skimmed
>
> and it's the complete set of skimmed files (1 through 5 includes 
> other), the plot pass1_pipip.pdf, is a selection of events
> proton pi+ pi- where:
>
> 0.44 < M(pi+pi-) <0.54
> and
> 0.<MM(p pi+pi-) <0.28
>
> and the missing mass of proton is plotted !
>
> So the figure pass0_pipip.pdf is the same thing from pass0 from exact 
> same files !
>
> Gagik.
>
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