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

Mon Nov 1 15:57:07 EDT 2010

Sung,

For the z-vertex distribution study it would be useful to look at the 
z-vertex from TBTR and MVRT for the momentum and angles shown on slide 5 
from my presentation http://www.jlab.org/~dugger/g9/g9a/2010-09-10.pdf .

I was seeing very poor vertex resolution using TBTR when the lab angle of 
the proton was less than 30 degrees and the momentum was less than 400 
MeV/c. I did not look at the pion distributions from TBTR. Steffen showed 
that the momentum magnitude did not greatly affect the pi+ vertex 
resolution when the angle was integrated, but perhaps there is a problem 
with the small angles for pi+ (see 
http://www.jlab.org/Hall-B/secure/g9/g9_strauch/piplus_E/).

-Michael

On Mon, 1 Nov 2010, Sungkyun Park wrote:

> Eugene,
>
> All plots I made use the MVRT bank now.
>
> I only want to know if there are big differences in z-Vertex distribution  when I use MVRT bank or GPID bank in several cases. (that is , ranges of the different proton momentum or theta angle).
>
> - Sung
>
>
> ----- Original Message -----
> From: Eugene Pasyuk <pasyuk at jlab.org>
> Date: Monday, November 1, 2010 3:33 pm
> Subject: Re: [Frost] The basic cuts, Energy Correction, and Momentum Correction of FSU in FroST
> To: frost at jlab.org
>
>> 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 Î» pulls for each
>>>> particle
>>>> coming from the CH2 are negative and small, whereas the means for
>>>> Î» 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
>>>>>> _______________________________________________
>>>>>> Frost mailing list
>>>>>> Frost at jlab.org
>>>>>> https://mailman.jlab.org/mailman/listinfo/frost
>>>>>>
>>>>> _______________________________________________
>>>>> Frost mailing list
>>>>> Frost at jlab.org
>>>>> https://mailman.jlab.org/mailman/listinfo/frost
>>>>>
>>>>
>>>
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