[G12] MC TOF Resolution

[Michael C. Kunkel]

On 7/18/13 1:57 PM, Lei Guo wrote:
>
> 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?
No, I mean 2ns, some would say this is liberal so even a 1.5 ns cut is 
well inbounds for my 2 sets of data.
>
> 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>_______________________________________________ 
>>>>
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>>>
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>>>     /   ___  ___  Lei Guo _______________________
>>>    L_O_/ ____ Florida International University____/_/
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>>>
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>>>
>>>
>>>
>>>
>>>
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>        @
>       /    *
>      /   ___  ___  Lei Guo _______________________
>     L_O_/ ____ Florida International University____/_/
>         \   |             Physics Dept., CP 212                       
> /  /
>      /    \ |             Miami, FL 33199 /                       /  /
>     /  I_/ \  ____ USA _____ /______/__________/  /
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