<br><div class="gmail_quote"><blockquote class="gmail_quote"><div class="im">On Thu, 11 Mar 2010, David Flay wrote:<br>
> The high momenta data have the largest error bars (in particular p =<br>
> 1.70 GeV) as we have a very short list of runs to use (I am currently<br>
> using all of them).<br></div></blockquote><div><br><br>On Thu, Mar 11, 2010 at 10:38 PM, Brad
Sawatzky <<a href="mailto:brads@jlab.org">brads@jlab.org</a>> wrote: <br></div><blockquote class="gmail_quote">
Sanity check the run-list. We spent most of our time running at the<br>
highest momenta. The total statistics should be comparable to the lower<br>
momentum runs (this was by design). Your "short list of runs" statement<br>
doesn't make sense...<br></blockquote><div><br>I should've worded this better -- I meant only at p = 1.70 GeV. There are a plentiful supply of runs for p = 1.60 GeV. <br><br>Unless there are mislabeled runs (runs that are really 1.70 GeV, but are not labeled as such), and I'm missing them..<br>
<br></div><blockquote class="gmail_quote">
Note that you can bin all runs for a given beam energy + LHRS momentum<br>
setting together in order to parametrize the shape of the pion<br>
contamination (the LHRS just sees a pion energy distribution, and that<br>
energy distribution doesn't care about polarization). You then fit that<br>
shape to the residual pions for each unique kinematic to get the<br>
associated contamination (grouping runs by polarization state too for<br>
this bit).<br></blockquote><div><br>I'll get some more runs together for each p. <br></div><div><br> </div><blockquote class="gmail_quote">
The better question is what is the error on your fit/subtraction? That<br>
is, you say your total subtraction is 2% -- a pretty small number. Say<br>
your relative uncertainty on that 0.02 correction is 50%. That sounds<br>
pretty bad, but in the end it is only a 1% absolute contribution to the<br>
error budget and that's what matters.<br></blockquote><div><br>I'll take a closer look at the uncertainties in the fits. <br><br></div></div><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/~flay">http://www.jlab.org/~flay</a><br> <a href="http://quarks.temple.edu">http://quarks.temple.edu</a><br>-----------------------------------------------------------<br>
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