[Frost] How do you find the dilution factor?

[mcandrew at jlab.org]

Sung,

I think I used dilution factor = (number of events in butanol - number of
events in carbon)/number of events in butanol.

In order to obtain these values, I use the missing mass histogram from
butanol and the missing mass histogram from carbon scaled to butanol.

I explain it on this webpage:

http://www2.ph.ed.ac.uk/~s0783525/carbon_background.htm

The method still needs some improvement ie. taking into account energy and
theta and is a first approximation.

Any further questions, let me know.

Have a good weekend,
Jo.

>
> Sung,
>
> My previous email was wrong. Your dilution factor equation makes sense
> with the use on the helicity web page. It took me a couple of minutes to
> figure out how you put the dilution factor together.
>
> Sorry for the confusion.
>
> Take care,
> Michael
>
> On Fri, 25 Feb 2011, Michael Dugger wrote:
>
>>
>> Sung,
>>
>> I have been using the subtraction method, so there might be some problem
>> with my understanding on how these dilution factors are put together and
>> used.
>>
>> I could be wrong, but I think that your definition of the dilution
>> factor
>> might be inverted with respect to what I see on the helicity web page:
>> http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Helicity_assignment_for_g9a
>> Also there might be a sign problem.
>>
>> You might want to define how you are using the dilution factor. For
>> example:
>>
>> E = (1/(D*P))*[N_a - N_b]/[N_a + N_b],
>>
>> Or
>>
>> E = (D/P)*[N_a - N_b]/[N_a + N_b],
>>
>> where
>> D = dilution factor
>> P = beam*target polarizations
>> ...etc
>>
>> -Michael
>>
>> On Fri, 25 Feb 2011, Sungkyun Park wrote:
>>
>>> Hi Jo,
>>>
>>> In your update, I have a simple question.
>>> How do you find the Dilution Factor?
>>>
>>> I define the dilution factor as the ratio between the hydrogen and the
>>> full butanol contribution to the cross section. I used the following
>>> equation:
>>>
>>> (Dilution factor) = 1 - N(carbon)/N(Butanol)*(Scaling Factor)
>>> where N(carbon) is the number of event in carbon and I count the events
>>> in the missing mass plot of carbon. N(Butanol) is the number of event
>>> in buutanol.
>>>
>>> Sung
>>> Florida State University
>>>
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