<div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr">---------- Forwarded message ---------<br>From: Michael Paolone <<a href="mailto:mpaolone@jlab.org">mpaolone@jlab.org</a>><br>Date: Fri, Jul 3, 2015 at 5:40 PM<br>Subject: Re: ECin/ECout not used with clasEvent::IsLepton() ??<br>To: Johann Goetz <<a href="mailto:theodore.goetz@gmail.com">theodore.goetz@gmail.com</a>><br></div><br><br>Hey Johann,<br>
<br>
The answer is simple. There are more and more restrictive cuts you can<br>
always do to try to clean up a lepton signal, but the general CC, TOF, and<br>
ECtot are the most robust. After that you can make further cuts on Ecin<br>
and/or ECout at your discretion. The g7 lepton cuts were the standard<br>
isLepton(), plus a >45 MeC ECin cut (see Rakhsha's analysis note here:<br>
<a href="https://www.jlab.org/Hall-B/secure/nuclear/g7-analysis/" rel="noreferrer" target="_blank">https://www.jlab.org/Hall-B/secure/nuclear/g7-analysis/</a>) and that's it.<br>
<br>
There are additional 2D isLepton_EC cuts in clasEvent to help clean up the<br>
signal, but the ECtot does "most" of the work already.<br>
<br>
Short answer: IsLepton() in g12 was made to be a balanced between good<br>
lepton selection without being aggressively restrictive. Like any other<br>
PID, it is up to the individual analyses to show the validity of their<br>
particle selection, and make additional cuts as needed.<br>
<br>
-Michael<br>
<br>
> Hi Mike, Take a look at this issue:<br>
><br>
> <a href="https://github.com/JeffersonLab/clasdoc-g12-procedures/issues/69" rel="noreferrer" target="_blank">https://github.com/JeffersonLab/clasdoc-g12-procedures/issues/69</a><br>
><br>
> Eugene et al. writes:<br>
><br>
> The note refers to the g7 lepton id scheme in explaining the chosen cuts:<br>
> in g7 however, not only cuts on the total calorimeter energy but also cuts<br>
> on the inner and outer energy were used: why were these not considered<br>
> necessary in the present analysis?<br>
><br>
> MK, Lei and I just looked at clasEvent::IsLepton() and it only uses Etot.<br>
> Can you explain this so we can answer this question from the committee?<br>
> Thanks,<br>
> Johann.<br>
><br>
<br>
<br>
</div></div>