[Frost] vertex dependence

[Michael Dugger]

Hi,

I like that this technique has good sensitivity for determining the target 
edges, but I don't understand the correlation between the flat region and 
physical target.  Can you help me understand?

Thanks.

-Michael


On Thu, 24 Mar 2011, Eugene Pasyuk wrote:

> Yes, new plots around 90 degrees give even more pronounced indication
> that the cell might be actually off by -5mm or so from where we think it is.
>
> -Eugene
>
> On 03/24/11 17:18, Steffen Strauch wrote:
>> Dear Colleagues,
>>
>> In today's meeting we looked at z-vertex dependences of the experimental asymmetry and missing mass in the pi+n channel.  As a follow up of our discussion I updated the document at
>>
>> http://www.jlab.org/Hall-B/secure/g9/g9_strauch/mtg/20110324_zvertex.pdf
>>
>> It now includes a set of distributions for events within a narrow angular range about theta(lab) = 90 deg.  The 'missing mass' values are the mean values of the missing masses in the final state averaged over a range up to 1 GeV.  They are not peak positions of the missing neutron peak.  Particularly the z-vertex distribution of the 'missing mass' shows with the tight angle cut distinct variations at z = -3 cm and z = +2 cm, the end points of the target?
>>
>> All the best,
>> Steffen
>>
>>
>>
>>
>>
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