<html><body><div><blockquote type="cite"><font color="#000000" class="Apple-style-span"><br></font><div><b>From: </b>Valery Kubarovsky <<a href="mailto:val.kuba@gmail.com">val.kuba@gmail.com</a>><br></div><div><b>Date: </b>August 28, 2009 10:45:04 AM EDT<br></div><div><b>To: </b><a href="mailto:jgoetz@ucla.edu">jgoetz@ucla.edu</a><br></div><div><b>Cc: </b><a href="mailto:g12@jlab.org">g12@jlab.org</a>, Paul Stoler <<a href="mailto:stolep@rpi.edu">stolep@rpi.edu</a>><br></div><div><b>Subject: </b><b>Check g12 pass1 data</b><br></div><br><br>Hi,<br>I made a brief check of the g12 pass1 data. The files that I analyzed<br>are at /work/clas/clasg12/clasg12/pass1/bos.<br>I am using seb analysis code.<br><br>Two files are attached to the mail. They are identical, but with<br>various y scales: log and lin.<br>The ps files are organized as follows:<br><br>First Page.<br>4 pictures from first 4 skims directories.<br>- 1ckaon1ctr<br>- 2pos1neg<br>-3 2ctrk<br>-4 not_2ctr<br><br>Second page<br>- other<br>- 1lepton<br>- 4ctrk<br>- ppbar<br><br>As you know we have ONLY skim files in the output from cooking<br>program. Nobody did it before. Usually the analysis groups write to<br>the silo one main bos file with no additional cuts at all (plus some<br>skim files for quick access to the particular data set).<br><br>1. If you will take to the first page you will notice that the number<br>of charged tracks are not in a perfect agreement<br>with the skim scheme. For example, there are event with 0 tracks and<br>one track in the skim with 1 charged kaon and one charge track.<br>Probably it is coming from the different analysis code that I am using<br>(seb). The discrepancy is at the level of 2% or so.<br><br>2. More serious observation is at the Page N3 (look log version). You<br>will find the kaon signal in ALL 4 skim streams. However it was<br>supposed to appear only in the skim N1. It means actually that this<br>skim has no sense because you will need to analyze ALL fore skims to<br>pick up the events with kaons.<br><br>3. The number of K+<br>1 skim - 22500 out of 104430 events<br>2 skim - 1660 out of 77585 events<br>3 skim - 3750 out of 185727 events<br>4 skim - 2400 out of 10995 events<br><br>4. The number of K-<br>1 skim - 10000 out of 104430 events<br>2 skim - 2400 out of 77585 events<br>3 skim - 2400 out of 185727 events<br>4 skim - 600 out of 10995 events<br><br>So you see that the number of charged kaons is big in the skims N 2,3 and 4.<br><br>People who will work with another reactions (for example pi_ pi- pi+)<br>will need to analyze ALL skim files as well.<br>It is extremely inconvenient because you will need to get 5 files from<br>silo to analyze the data.<br><br>I propose to return back to the conventional CLAS cooking procedure<br>when only one bos file is written to the silo with NO skims at all.<br>We can produce the additional skim outputs with more stringent cuts<br>to have the possibility to get quick access for the<br>particular reactions (for example with two kaons or 3 charge track3).<br><br>However in general there is not a big problem to make skim from the<br>raw cooking files. I made it many times and it did not take a huge<br>time.<br>Usually two weeks of farm time is enough to make any skim from the raw<br>cooking files.<br><br>Best regards,<br>Valery<br><br><br><br><br><br>On Wed, Aug 26, 2009 at 10:50 AM, Johann Goetz<<a href="mailto:jgoetz@ucla.edu">jgoetz@ucla.edu</a>> wrote:<br><blockquote type="cite">Hi,<br></blockquote><blockquote type="cite">I have two files for each of the eight skims cached here:<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">/work/clas/clasg12/clasg12/pass1/bos<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Please look at all of the skims to make sure you see events only in the<br></blockquote><blockquote type="cite">skims you expect, thank you,<br></blockquote><blockquote type="cite">Johann.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">_______________________________________________<br></blockquote><blockquote type="cite">G12 mailing list<br></blockquote><blockquote type="cite"><a href="mailto:G12@jlab.org">G12@jlab.org</a><br></blockquote><blockquote type="cite"><a href="https://mailman.jlab.org/mailman/listinfo/g12">https://mailman.jlab.org/mailman/listinfo/g12</a><br></blockquote><blockquote type="cite"><br></blockquote></blockquote></div></body></html>