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Greetings,<br>
<br>
I have reproduced my pion/lepton analysis partly. However I think
the plots I show in the attachment can aide in the understanding of
why further constraints, such as Cherenkov or Electromagnetic
Calorimeter, is needed.<br>
<br>
page 1) <br>
Black: Mx(p) with Mx(pe+e-) cuts <br>
Purple : Mx(p) with Mx(ppi+pi-) cuts <br>
conclusion: for eta there is a slight rejection, but nothing that
concretely give favor to leptons over pions, or vise-versa.<br>
<br>
page 2) <br>
Black: M(e+e-gamma) with Mx(pe+e-) cuts <br>
Purple : M(pi+pi-gamma) with Mx(ppi+pi-) cuts <br>
conclusion: Hadronic contribution of pions appears dominant, makes
sense since the cross-section of this is greater<br>
<br>
page 3) <br>
Gold: Mx(p) with Mx(pe+e-) cuts also EC/CC requirements defined by
g12<br>
Cyan : M(e+e-gamma) with Mx(pe+e-)cuts also EC/CC requirements
defined by g12<br>
conclusion: Without bremsstrahlung correct, the missing mass has
better resolution, however the EC/CC cuts show peak definition<br>
<br>
So, I hope it can be seen why I am over speculative about the
analysis involving leptons PID through mass setting only.<br>
<br>
Again, I hope this helps.
<pre class="moz-signature" cols="72">BR
MK
----------------------------------------
Michael C. Kunkel, PhD
Forschungszentrum Jülich
Nuclear Physics Institute and Juelich Center for Hadron Physics
Experimental Hadron Structure (IKP-1)
<a class="moz-txt-link-abbreviated" href="http://www.fz-juelich.de/ikp">www.fz-juelich.de/ikp</a></pre>
<div class="moz-cite-prefix">On 7/9/15 1:11 AM, Amaryan, Moskov
wrote:<br>
</div>
<blockquote cite="mid:A80FBF5B-F5A5-4D58-8F5F-C7391E8F5A6D@odu.edu"
type="cite">
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<div style="word-wrap:break-word">Dear all,
<div><br>
</div>
<div>I attach a plot with Mx(p)^2 and M(e+e-\gamma)^2
distributions overlaid. Statistics of both histograms are the
same,</div>
<div>however, as one can see there is no peak of eta in the
invariant mass squared, data are from g11.</div>
<div>Invariant mass has no eta in it similar to what Michael
showed for g12.</div>
<div>One can think of two possibilities, either these are true
eta’s decaying to e+e-\gamma, or these are remnants of
eta->pi+pi-gamma events.</div>
<div>The latter hypothesis was ruled out by plotting invariant
mass of pi+pi-\gamma or missing mass of proton for pion mass
assignment</div>
<div>for the same events that make Mx(p)^2 under lepton
assignment.</div>
<div><br>
</div>
<div>Best regards,</div>
<div>Moskov.</div>
<div><br>
<div>
<div>On Jul 8, 2015, at 11:02 PM, Amaryan, Moskov <<a
moz-do-not-send="true" href="mailto:MAmaryan@odu.edu">MAmaryan@odu.edu</a>>
wrote:</div>
<br>
</div>
</div>
</div>
</blockquote>
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