[G12] Fwd: G12 post from val.kuba at gmail.com

[Paul Eugenio]

>
> From: Valery Kubarovsky <val.kuba at gmail.com>
> Date: August 28, 2009 10:45:04 AM EDT
> To: jgoetz at ucla.edu
> Cc: g12 at jlab.org, Paul Stoler <stolep at rpi.edu>
> Subject: Check g12 pass1 data
>
>
> Hi,
> I made a brief check of the g12 pass1 data. The files that I analyzed
> are at  /work/clas/clasg12/clasg12/pass1/bos.
> I am using seb analysis code.
>
> Two files are attached to the mail. They are identical, but with
> various y scales: log and lin.
> The ps files are organized as follows:
>
> First Page.
> 4 pictures from first 4 skims directories.
> - 1ckaon1ctr
> - 2pos1neg
> -3 2ctrk
> -4 not_2ctr
>
> Second page
> - other
> - 1lepton
> - 4ctrk
> - ppbar
>
> As you know we have ONLY skim files in the output from cooking
> program. Nobody did it before. Usually the analysis groups write to
> the silo one main bos file with no additional cuts at all (plus some
> skim files for quick access to the particular data set).
>
> 1. If you will take to the first page you will notice that the number
> of charged tracks are not in a perfect agreement
> with the skim scheme. For example, there are event with 0 tracks and
> one track in the skim with 1 charged kaon and one charge track.
> Probably it is coming from the different analysis code that I am using
> (seb). The discrepancy is at the level of 2% or so.
>
> 2. More serious observation is at the Page N3 (look log version). You
> will find the kaon signal in ALL 4 skim streams. However it was
> supposed to appear only in the skim N1. It means actually that this
> skim has no sense because you will need to analyze ALL fore skims to
> pick up the events with kaons.
>
> 3. The number of K+
> 1 skim  -  22500 out of 104430 events
> 2 skim  -   1660 out of   77585 events
> 3 skim  -   3750 out of  185727 events
> 4 skim  -   2400 out of   10995 events
>
> 4. The number of K-
> 1 skim  -  10000 out of 104430 events
> 2 skim  -   2400 out of   77585 events
> 3 skim  -   2400 out of  185727 events
> 4 skim  -    600 out of   10995 events
>
> So you see that the number of charged kaons is big in the skims N  
> 2,3 and 4.
>
> People who will work with another reactions (for example pi_ pi- pi+)
> will need to analyze ALL skim files as well.
> It is extremely inconvenient because you will need to get 5 files from
> silo to analyze the data.
>
> I propose to return back to the conventional CLAS cooking procedure
> when only one bos file is written to the silo with NO skims at all.
> We can produce the additional skim outputs with  more stringent cuts
> to have the possibility to get quick access for the
> particular reactions (for example with two kaons or 3 charge track3).
>
> However in general there is not a big problem to make skim from the
> raw cooking files. I made it many times and it did not take a huge
> time.
> Usually two weeks of farm time is enough to make any skim from the raw
> cooking files.
>
> Best regards,
> Valery
>
>
>
>
>
> On Wed, Aug 26, 2009 at 10:50 AM, Johann Goetz<jgoetz at ucla.edu> wrote:
>> Hi,
>> I have two files for each of the eight skims cached here:
>>
>> /work/clas/clasg12/clasg12/pass1/bos
>>
>> Please look at all of the skims to make sure you see events only in  
>> the
>> skims you expect, thank you,
>> Johann.
>>
>> _______________________________________________
>> G12 mailing list
>> G12 at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/g12
>>
>
>
>
>
>
>

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