Re: [Brahms-dev-l] tracking efficiency

Hi

let me just second the comment by Natalia; I do not belive there is much reason to belive that the FFS
tracking effeciencies with T1 and T2 would change musch (if at all) within a runperiod. So take the efficiencies from nearby runs 
but with good statistics.

Flemming

--------------------------------------------
F. lemming Videbaek
Physics Department
Bldg 510-D
Brookhaven National Laboratory
Upton, NY11973

phone: 631-344-4106
cell:       631-681-1596
fax:        631-344-1334
e-mail: videbaek @ bnl gov
----- Original Message ----- 
From: "Natalia Katrynska" <n.katrynska_at_if.uj.edu.pl>
To: <hongyan_at_ift.uib.no>
Cc: "devlist" <brahms-dev-l_at_lists.bnl.gov>
Sent: Friday, January 26, 2007 1:50 PM
Subject: Re: [Brahms-dev-l] tracking efficiency


> Hi Hongyan,
>
> If you have setting where there are one or two runs with FFs tracks
> probably you could estimate the efficiency using calculated maps (like
> in 8B843 with run 8159; 8A230: runs 8154 and 8155; 8B230: run 8158).
> In case  you don't have maps for given setting (e.g. 8B427) it might be
> estimated taking the efficiency of other setting (8A427 -  here you
> should be careful because the efficiency is calculated only for one run;
> by the way in the setting 8B427 there is also only one run).
>
> With regards,
> nat
>
>
>> Hi Natalia,
>>
>>   thanks a lot for making this efficiency maps for d+Au data. I have
>> one question - can you estimate the FFS tracking efficiencies for 8
>> and 12 deg as well? (as I mentioned in my previous mail to you, about
>> the data situation for those runs at 8 and 12 deg, most of them only
>> has FFS tracks (especially for 8 deg data). And I have been trying to
>> analyze only the FFS data, using H1 to do PID, which requires the
>> efficiency only calculated for FFS. The list you have had already.)
>>
>>   I would test the maps at 4 deg, you have had made already. I will
>> let you know its performance.
>>
>> Many thanks,
>>  Hongyan
>>
>>
>> Natalia Katrynska wrote:
>>
>>> Hi Hongyan,
>>>
>>>  I've just put efficiency maps in to the official place
>>> /brahms/data08/corrections/trackEff/MappedEffic_run03_dau_200_nkv1.root,
>>> for gtrProd=3 and ltrProd=2. According to your suggestions I took all
>>> runs which you'd given me for 4deg data.
>>> However, for 8&12deg I calculated efficiencies ONLY for runs that
>>> contain full FS tracks (this conditions is required by the efficiency
>>> code).
>>>
>>> 1.For 4deg settings almost all runs don't have tracks
>>> in detector T3, thus T3 and T2 efficiencies are 0 which is
>>> correct and you shouldn't worry about that.
>>>
>>> In 4B3450 setting 8219 & 8220 runs have only a few tracks in the
>>> whole setup, don't they?
>>>
>>> 2. A similar situation is in the other 8 and 12 deg settings, but
>>> here it
>>> happens that some runs don't look good e.g. for T1 detector (I rejected
>>> runs: 8513 in 8A843; 8622-12A1692; 8560-12A843).
>>>
>>> In 8B843 setting  run 8159 has only FFS tracks, so for the full FS track
>>> analysis you should remove it.
>>>
>>> 3.In 12A843 I rejected run 8375.  This run is the only one that has
>>> T3 tracks. I suggest you to remove this runs from your analysis or
>>> treat it separately. It is not only the issue of efficiency but also
>>> of the momentum resolution.
>>>
>>>  If you have questions, please let me know.
>>>
>>> Best regards,
>>> nat
>>>
>>>
>>
>>
>
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