<br><br><div class="gmail_quote">On Wed, Dec 14, 2011 at 2:06 PM, ZEIN-EDDINE MEZIANI <<a href="mailto:meziani@temple.edu">meziani@temple.edu</a>> wrote:<br><blockquote class="gmail_quote">
Slide 9: Live time is underscored I presume it should be L_T, it looks like _LT<br><br>Slide 14: Do you know whether the statistics of the experiment reaches the proposal goal.<br>I know Matt and you did the exercise of of roughly checking that it is true. It would be good to check it again and perhaps mention what it is in comparison to the proposal. <br>
</blockquote><div><br>A while back, Dave and I did a check on the total statistics that we collected. To estimate this, we took one run and applied our good electron cuts at the time, for different momentum bins, and counted the events that survived the electron cuts which we will call Ne. We then formed a ratio of good events that we said were electrons to total events that were recorded for that run, we will call the total events recorded for that run Nraw. We then computed the total recorded events for all of our production runs, we will call the sum of events over all production runs Nt. Next we multiplied the ratio of good electrons/total events for the one run mentioned above and the total events over all runs. So the total statistics for a particular momentum bin was defined as:<br>
<br> (Ne/Nraw)*Nt<br>
<br>However, this is not really correct. During our 5.89GeV running, our T2 trigger was changed quite a bit. By changing the T2 trigger we will be changing the ratio of good electron to recorded events for that particular run (Ne/Nraw) depending on the trigger setting and this will affect our estimate. <br>
<br></div><blockquote class="gmail_quote">
The absolute systematic errors of course will depend on the size of the asymmetry but perhaps we can start to look at the dominant contributions.<br><br></blockquote><div> I believe our current systematic error on the target polarization is the more dominate one at 4.9%. This should be reduced once the water calibration is taken into account. <br>
</div><blockquote class="gmail_quote">Zein-Eddine</blockquote><div><br>-Matt <br></div><blockquote class="gmail_quote">
<div><div><br><br><div class="gmail_quote">On Wed, Dec 14, 2011 at 1:35 PM, David Flay <<a href="mailto:flay@jlab.org">flay@jlab.org</a>> wrote:<br>
<blockquote class="gmail_quote">Hi all,<br>
<br>
I plan on submitting my talk (version 6) tomorrow morning and make sure it<br>
looks OK on the projector. Please let me know if there are any last<br>
comments by tonight so that I can make the necessary changes. The talk is<br>
here:<br>
<br>
<a href="https://hallaweb.jlab.org/wiki/images/8/85/D2n_12_2011_v6.pdf">https://hallaweb.jlab.org/wiki/images/8/85/D2n_12_2011_v6.pdf</a><br>
<br>
Thanks,<br>
<br>
Dave<br>
<br>
-------------------------------------------------<br>
David Flay<br>
Physics Department<br>
Temple University<br>
Philadelphia, PA 19122<br>
<br>
office: Barton Hall, BA319<br>
phone: <a href="tel:%28215%29%20204-1331">(215) 204-1331</a><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>
-------------------------------------------------<br>
<br>
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</blockquote></div><br><br clear="all"><br></div></div><font color="#888888">-- <br>Z.-E. Meziani<br>Department of Physics<br>Temple University<br>1900 N. 13th St.<br>Philadelphia, PA 19122-6082<br><a href="tel:215-204-5971">215-204-5971</a><br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Matthew Posik<br>Email: <a href="mailto:posik@temple.edu">posik@temple.edu</a><br>Temple University Physics Dept.<br>Office: BA-319<br>Office #: <a href="tel:215-204-1331">215-204-1331</a> <br>
WebSites:<br>
Temple:<br><a href="http://quarks.temple.edu/">http://quarks.temple.edu/</a><br>d2n:<br><a href="http://hallaweb.jlab.org/experiment/E06-014/">http://hallaweb.jlab.org/experiment/E06-014/</a><br>
<br>