[G12] Yield Study

[Dennis Weygand]

I suggest that this discussion should not be had over email, our Wed meeting is tomorrow. 


However, let me clarify a few points:
On Mar 22, 2011, at 8:13 AM, Eugene Pasyuk wrote:

> That would be in an ideal setup.

Correct- I meant that the yield of omegas should be current independent in the ideal case.

> 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.

Not exactly: we did have a 3-prong trigger over the tagger low energy


> But you see it and it 
> increases as you increase beam intensity. It also also could be rate 
> dependent trigger efficiency for high energies.

Hard to imagine any efficiency going up with rate....

> When you look at omegas outside of trigger region they are all ACCIDENTALS.

Not exactly, for the reason stated above

> 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 is hard to do without a trigger latch


> 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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>>>>> University____/_/ \ | Physics Dept., CP 212
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>>>>> / / / / / / / /
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>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
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>>>> 
>>>> Graduate Student, Florida State University.
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>> --
>> Dennis Weygand
>> weygand at jlab.org <mailto:weygand at jlab.org>
>> (757) 269-5926
>> 
>> 
>> 
>> 
>> 
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--
Dennis Weygand
weygand at jlab.org
(757) 269-5926