[G12] MC TOF Resolution

[Lei Guo]

On Jul 18, 2013, at 1:39 PM, Michael C. Kunkel wrote:

> Hi Lei,
>
> The blue is MC and red is data.
> Yes the data is wider than the MC but normal timing cut is 2ns,  
> which is well in bounds for both sets of data.

Do you mean +-1ns?

Lei
>
> I use the same flags Mukesh derived for gpp and the same flags  
> located on the G12 MC page for gamp2part.
>
> BR
> MK
> On 7/18/13 1:41 PM, Lei Guo wrote:
>> HI, MK,
>>
>> Is blue the simulation? In that case, your looks like what is  
>> expected from MC data. What are the flags you used in your  
>> simulation steps?
>>
>> On the other hand, it seems that the data is wider than simulation,  
>> so the same cut in timing for MC as that used in MC would  
>> overestimate the acceptance, and probably lead to a systematic  
>> lowering of the cross sections.
>>
>> Lei
>> On Jul 18, 2013, at 9:26 AM, Michael C. Kunkel wrote:
>>
>>> Maybe I should be a little more specific for the group.
>>>
>>> I looked at the lepton timing last night. I have attached the  
>>> plots I sent to Jason. I see nothing wrong with the MC timing or  
>>> maybe I do not understand his problem correctly.
>>>
>>> On the attached plots, red represents the actual G12 data and  
>>> black is a simulation. The title of the plots tell you the species  
>>> of lepton(electron(Em)/positron(Ep)). The quantity plotted is Tpho  
>>> + tprop - scvertextime, where scvertextime = sc_time - scPathLen/ 
>>> (LIGHT_SPEED * beta)
>>>
>>> BR
>>> MK
>>>
>>> On 7/18/13 9:18 AM, Michael Kunkel wrote:
>>>> What was wrong with the plots I sent you before you sent this  
>>>> email?
>>>>
>>>> BR
>>>> MK
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Jul 18, 2013, at 8:17, Jason Bono <jbono at jlab.org> wrote:
>>>>
>>>>> Hello all, since mukesh did his MC TOF study we have been using  
>>>>> the gpp flags he determined which are found both on the wiki and  
>>>>> in the g12 Analysis Procedures, Statistics and Systematics  
>>>>> note.   The wiki shows that the gpp flags:
>>>>>
>>>>> -a=2.73 -b=1.7 -c=1.93 -f=1
>>>>>
>>>>>
>>>>> which gives SHOULD give a timing resolution of about 0.2 ns as  
>>>>> shown in Mukesh's plot:
>>>>>
>>>>> <Screen Shot 2013-07-17 at 10.54.18 AM.png>
>>>>>
>>>>> When I generate events as outlined by Mukesh or in the g12 note  
>>>>> i get a resolution two times a wide and is not really gaussian.   
>>>>> As of now I suspect the problem is coming from gamp2part but i  
>>>>> haven't yet confirmed.  I would like to find the problem so that  
>>>>> the g12 analysis procedures note can be updated and accurate.
>>>>>
>>>>>
>>>>>  Ive spoken with a few people who said that they get this same  
>>>>> resolution but have not seen a plot like above.  Since Mukesh is  
>>>>> now gone can someone who has been producing MC with this  
>>>>> resolution make the able plot and show it in today's or next  
>>>>> weeks g12 meeting along with exactly how they generated the  
>>>>> events?  i.e. something like:
>>>>>
>>>>>
>>>>> genr8 -BLLL,UUU -MNNN -owork.gamp L0 -U10 < genr8input_XXX.VVV
>>>>> gamp2part -r10 -owork.part -T -S-0.321,0.378,-0.254,0.407 - 
>>>>> z-110,-70 work.gamp
>>>>> gsim_bat -ffread ffread.g12 -kine 1 -mcin work.part -bosout  
>>>>> work.gsim -trig 2000000
>>>>> gpp -Y -s -a2.73 -b1.7 -c1.93 -f1 -R10 -P0x7f -owork.gsim.gpp  
>>>>> work.gsim
>>>>> a1c -T4 -sa -ct1930 -cm0 -cp0 -X0 -d1 -F -P0x1bff -z0,0,-90 - 
>>>>> Aprlink_tg-90pm30.bos -owork.gsim.gpp.a1c work.gsim.gpp
>>>>>
>>>>>
>>>>> Which is my current template I use for generation.
>>>>>
>>>>> Thanks,
>>>>> Jason
>>>>> _______________________________________________
>>>>> G12 mailing list
>>>>> G12 at jlab.org
>>>>> https://mailman.jlab.org/mailman/listinfo/g12
>>>> _______________________________________________
>>>> G12 mailing list
>>>> G12 at jlab.org
>>>> https://mailman.jlab.org/mailman/listinfo/g12
>>>
>>> < 
>>> Em_timingcompare.png 
>>> > 
>>> < 
>>> Ep_timingcompare.png>_______________________________________________
>>> G12 mailing list
>>> G12 at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/g12
>>
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>>      /    *
>>     /   ___  ___  Lei Guo _______________________
>>    L_O_/ ____ Florida International University____/_/
>>        \   |             Physics Dept., CP  
>> 212                       /  /
>>     /    \ |             Miami, FL 33199 /                       /  /
>>    /  I_/ \  ____ USA _____ /______/__________/  /
>>   /   /      
>> L                /              / /                       /  /
>>  /   /                       /              / /                       /  /
>> /_/__________/______/______/__________/_/
>> /_/__________/______/______/__________/_/
>> 305-348-0234(o)
>>
>> **************************************
>>
>>
>>
>>
>>
>>

**************************************
        @
       /    *
      /   ___  ___  Lei Guo _______________________
     L_O_/ ____ Florida International University____/_/
         \   |             Physics Dept., CP  
212                       /  /
      /    \ |             Miami, FL  
33199        /                       /  /
     /  I_/ \  ____ USA _____ /______/__________/  /
    /   /      
L 
                 /              /              /                       /  /
   /   /                       /              /              /                       /  /
  /_/__________/______/______/__________/_/
/_/__________/______/______/__________/_/
305-348-0234(o)

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