<br><br><div class="gmail_quote">On Thu, Dec 16, 2010 at 11:18 AM, Brad Sawatzky <<a href="mailto:brads@jlab.org">brads@jlab.org</a>> wrote:<br><blockquote class="gmail_quote">
There are four ways E/p == 0:<br>
1) the code assigns E/p = 0 as a default value,<br>
2) the code assigns E/p = 0 as an error/bailout,<br>
3) the quantity E really is 0, and/or<br>
4) the quantity p is huge (ie. kBig).<br>
<br>
<br>
We need to know which of these cases is contributing to the non-physical<br>
E/p==0 number, and whether or not that makes sense. If some are due to<br>
trigger or hardware problems, then we need to make sure our efficiency<br>
corrections treat it properly.<br>
<br>
The single adc histograms for a single PMT aren't really sufficient<br>
since the majority of the zeros there just mean that that particular<br>
cell didn't interact with the particle (which is quite reasonable).<br>
What I would like to see verified is that the raw sum of the energy in<br>
the pion rejector layers equals the (summed) pedestal value. That is,<br>
I want to verify that getting E=0 out of the "high-level" code really<br>
means that we had negligible energy deposited in the cells at the lowest<br>
level. That would be case '3' in the list. If that's what is<br>
happening, then it is strange:<br></blockquote><div><br>Do you mean cutting on L.prl1.e==0 and seeing what shows up in L.prl1.asum_p (same for prl2)? I don't have a variable for the raw sum. In which case, the events at zero for L.prl1.asum_p and L.prl2.asum_p do show up at zero (blue curve in attached *.pdf).<br>
<br>My cuts are again listed in the titles, if you zoom in. I'll also have this plot in the meeting.<br><br> <br></div></div><br><br clear="all"><br>-- <br>-----------------------------------------------------------<br>
David Flay<br>Physics Department<br>Temple University<br>Philadelphia, PA 19122 <br><br>office: Barton Hall, BA319<br>phone: (215) 204-1331<br><br>e-mail: <a href="mailto:flay@jlab.org">flay@jlab.org</a> <br>
<a href="mailto:flay@temple.edu">flay@temple.edu</a><br><br>website: <a href="http://www.jlab.org/%7Eflay">http://www.jlab.org/~flay</a><br> <a href="http://quarks.temple.edu">http://quarks.temple.edu</a><br>
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