[G12] Yield Study

[Eugene Pasyuk]

That would be in an ideal setup. In an ideal setup with no accidentals 
and perfect trigger you would not see any yield of omegas from low 
energy photons which were not in the trigger. But you see it and it 
increases as you increase beam intensity. It also also could be rate 
dependent trigger efficiency for high energies.
When you look at omegas outside of trigger region they are all ACCIDENTALS.
What actually needs to be checked is the yield of omegas in trigger 
region normalized to the flux in trigger region vs. beam current. This 
should be constant if there is no rate dependent trigger (in)efficiency 
and yield is determined correctly (background properly subtracted)

-Eugene

Dennis Weygand wrote, On 03/21/11 23:41:
> I don't think that is what he means.... the flux he is normalizing to is
> the actual flux... the yield of any physics event should be independent
> of the current.
> Dennis
>
> On Mar 21, 2011, at 6:21 PM, Eugene Pasyuk wrote:
>
>> Hi Mukesh,
>>
>> This all makes sense. When you increase flux the fraction of
>> accidental triggers increases.
>> This is exactly what you see. Yield from low energies which were not
>> in trigger increases.
>>
>> -Eugene
>>
>> On 03/21/11 17:09, Mukesh Saini wrote:
>> > Lei is correct. The increase I mention is in :
>> >
>> > the total omega yield normalised to the photon flux for the whole
>> > Tagger for that particular run.
>> >
>> > I initially expected a drop-off in the normalised yield with beam
>> > current But that is not the case. In fact there is a substantial
>> > increase. After staring at all the plots for a while. It makes sense
>> > to me.
>> >
>> >
>> > ----- Original Message ----- From: Lei Guo <lguo at jlab.org> Date:
>> > Monday, March 21, 2011 4:38 pm Subject: Re: [G12] Yield Study To:
>> > Mukesh Saini <msaini at fsu.edu> Cc: g12 at jlab.org
>> >
>> >>
>> >> On Mar 22, 2011, at 4:00 AM, Mukesh Saini wrote:
>> >>
>> >>> Hello All,
>> >>>
>> >>> I have summarised the results from the study done on Omega Yield
>> >>>
>> >> for
>> >>> g12 at different Beam currents (40-80 nA) and we do observe
>> >> certain
>> >>> patterns.
>> >>>
>> >>> http://www.jlab.org/~mukesh/Strangeonia/Analysis/yield_study.pdf
>> >>>
>> >>> Observations:
>> >>>
>> >>> 1. We see an "increase" in Omega Yield from the whole Tagger
>> >>> spectrum as a function of current.
>> >>
>> >> Do you mean an increase after it is normalized to flux?
>> >>
>> >> Lei ************************************** @ / * / ___ ___
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>> >>
>> >>
>> >>
>> >>
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>> >
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> --
> Dennis Weygand
> weygand at jlab.org <mailto:weygand at jlab.org>
> (757) 269-5926
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