[G12] Question of the conversion hypothesis

[Michael C. Kunkel]

Greetings,


On page
https://clasweb.jlab.org/rungroups/g7/wiki/index.php/Reconstruction_study#Monday_March_25.2C_2013
I have the plots of the vert2 function in comparison to the MVRT


BR
MK



On 3/25/13 10:48 AM, Dennis Weygand wrote:
>
> did vert2 tomography show anything?
>
> On Mar 24, 2013, at 9:39 PM, Michael C. Kunkel wrote:
>
>> Greetings,
>>
>> It occurred to us that I should plot this with the same lepton 
>> momenta range. (0-1.5 GeV)
>> The plot is attached.
>>
>> BR
>> MK
>>
>>
>> On 3/24/13 7:42 PM, Michael C. Kunkel wrote:
>>> Greetings,
>>>
>>> I am still analyzing my vertex calculations, I have nothing final 
>>> yet to show.
>>>
>>> But I did have a question about the hypothesis that the events 
>>> outside of the target are conversions.
>>>
>>> If I were to have a different topology in which I could have a pi0 
>>> in the final state decay to e+e-gamma, then these events would also 
>>> show the same ratio of events outside of the target, correct?
>>>
>>> If so, then I can look at the gamma p -> P Pip Pim Pi0 (e+e-gamma) 
>>> MVRT and see what fraction of events occur outside of the target, 
>>> because according to the conversion hypothesis, 2 charged tracks 
>>> should be outside of the target and the other 3 should be inside, so 
>>> I would see a shifted distribution of the same.
>>>
>>> The fact is when I look at the vertex position for gamma p -> P Pip 
>>> Pim Pi0 (e+e-gamma, over 90% of my events are inside of the target.
>>>
>>> I have attached the plot showing the comparison. Both plots are 
>>> normalized.
>>> So I again ask how can the events from gamma p -> p pi0 have tracks 
>>> outside of the target? Conversion?
>>>
>>>
>>> BR
>>> MK
>>>
>>>
>>> _______________________________________________
>>> G12 mailing list
>>> G12 at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/g12
>>
>> <compare_vertices_PPipPimEpEmGamvs_PEpEmGam_samemomenta.jpg>_______________________________________________
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>
> --
> Dennis Weygand
> weygand at jlab.org <mailto:weygand at jlab.org>
> (757) 269-5926 (office)
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>
>
>
>

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