[Frost] The basic cuts, Energy Correction, and Momentum Correction of FSU in FroST

[Eugene Pasyuk]

Sung,

Why don't you use vertex from MVRT bank? It gives a better estimate of 
the vertex position especially when you have two or more tracks in the 
event. We discussed this at one of the meetings and recommendation was 
to use MVRT bank.

-Eugene




On 11/1/10 3:26 PM, Sungkyun Park wrote:
> Hi Michael,
>
> I also think the large shift of the lambda pulls in butanol target will be solved after applying the holding fields correction. If not, I will be in panic.
>
> Now I make correction factors of momentum correction from the CH2 data. The mean values of pull in CH2 target are located between -0.1 and 0.1. I also correct mean values in this range. Thus the current momentum correction can not correct -0.388, the pull's mean of the lambda (pi-) in the butanol target.
>
> I also added what particle's z-vertex is used in each topology in updated web (Z-Vertex).
> simply speaking, I use the z-vertex of proton in GPID bank in each topology except the topology gamma p ->  pi+ pi- (p). in missing proton topology, I used the z-vertex of pip in GPID.
>
> Thank you for your comments.
>
> Sung
> Florida State University
>
>
>
>
>
> ----- Original Message -----
> From: Michael Dugger<dugger at jlab.org>
> Date: Monday, November 1, 2010 2:51 pm
> Subject: Re: [Frost] The basic cuts, Energy Correction, and Momentum Correction of FSU in FroST
> To: Sungkyun Park<sp06k at fsu.edu>
> Cc: FROST<frost at jlab.org>
>
>>
>> Hi,
>>
>> I think it would be surprising if the problem is not due to the
>> holding
>> field.
>>
>> I put an additional line on the wiki:
>> "It is also worth noting that the means for the λ pulls for each
>> particle
>> coming from the CH2 are negative and small, whereas the means for
>> λ pull
>> coming from Butanol, are positive for positive particles, and
>> negative for
>> negative particles (and always large)"
>>
>>
>> -Michael
>>
>> On Mon, 1 Nov 2010, Michael Dugger wrote:
>>
>>>
>>> Sung,
>>>
>>> Thanks for updating the "Standard practices, common practices,
>> and common
>>> analysis issues for g9a" web page :)
>>>
>>> Comments:
>>> * For the z-vertex using GPID (TBTR) you should state what
>> particle is
>>> being used.
>>>
>>> * The CH2 pull angles look OK, but the Butanol lambda angles are
>>> especially bad. This might be explained by the target magnetic
>>> holding-field (I think that Eugene and Franz made this sort of
>> statement>  during one of the meetings where you showed these
>> pulls). I added a line
>>> about this to the wiki (including a link to your webpage).
>>>
>>> Let's hope that the holding field corrections get this lambda angle
>>> problem fixed.
>>>
>>> Good job.
>>>
>>> Take care,
>>> Michael
>>>
>>> On Mon, 1 Nov 2010, Sungkyun Park wrote:
>>>
>>>> Hi all,
>>>>
>>>> I have updated the EC and MomC of FSU, we mentioned at the last
>> Friday meeting
>>>>
>>>> 1. The Basic Cut
>>>>   http://www.jlab.org/Hall-B/secure/g9/sungkyun/11-1-10-ZVertex.html
>>>>
>>>> * I compare Z-vertex made in MVRT bank with GPID bank in several
>> cases.>>  * I put the basic cuts used to make the z-vertex
>> distribution.>>
>>>> 2. The FSU EC
>>>>   http://www.jlab.org/Hall-B/secure/g9/sungkyun/11-1-10-FSUEC.html
>>>>
>>>> * I put the equation of FSU Energy Correction.
>>>> * I compare FSU-EC with CMU-EC in several cases.
>>>>
>>>> 3. The FSU-MomC
>>>>   http://www.jlab.org/Hall-B/secure/g9/sungkyun/11-1-10-FSUMomC.html
>>>>
>>>> * I put the preliminary version of momentum correction
>>>> * I put the resolution parameters for three kinds of targets,
>> used in the covariance matrix.
>>>>
>>>> If you have some questions or comments, Let me know them
>>>>
>>>> Sungkyun Park
>>>> Florida State University
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>>>> https://mailman.jlab.org/mailman/listinfo/frost
>>>>
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>>
>
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