[G12] pass1 cooking

[Eugene Pasyuk]

Certainly, the difference needs to be understood. I don't know, it might 
be that omega does not like this cut and the fact that you see it in 
pass0 is not necessarily a good thing. Overall you have twice as many 
events from pass1 compared to pass0.
I am not claiming anything, just a thought.

-Eugene

Gagik Gavalian wrote:
> Dear Eugene,
>
> You're right, no reason to have that cut, but my skim was not intended 
> for the omega, it's just omega was the most abundant particle I could 
> extract from 2 files of my skim to check the quality.
>
> Like I mentioned in the e-mail, I'm in process of cooking the same files 
> (without any implicit cuts) using calibration constants from pass0. They 
> might be ready in a day or two, and I'll give an update.
>
> Nevertheless, even with the cuts on pi+pi- mass, the disappearance of 
> omega is a little troubling.
>
> Gagik.
>
> On 2/10/10 4:40 PM, Eugene Pasyuk wrote:
>   
>> 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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