[G12] Question of the conversion hypothesis

[Dennis Weygand]

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 
>> 
>> 
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> 
> <compare_vertices_PPipPimEpEmGamvs_PEpEmGam_samemomenta.jpg>_______________________________________________
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Dennis Weygand
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