[G12] pass1 cooking

[Gagik Gavalian]

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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