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<div class="moz-cite-prefix">Zisis et al,<br>
<br>
Here's the references for radiative eta(') decays:<br>
<br>
First check out Daniel Lersch's conference proceeding Figure 2 for
an example of the split-off cut they used in WASA at COSY: <br>
pos.sissa.it/archive/conferences/171/352/Confinement%20X_352.pdf
. The GlueX version of an appropriate contour cut might be
developed by comparing signal and background in E_gamma vs
Distance (ie, distance between a track and a shower). <br>
<br>
A few other papers (putting * next to the two references that
might represent the state of the art for the eta' Dalitz plot):<br>
<br>
Measurement of
Gamma(eta-->pi+pi-gamma)/Gamma(eta-->pi+pi-pi0) with the
KLOE detector, D. Babusci et al., Physics Letters B 718 (2013)
910-914. <a class="moz-txt-link-freetext"
href="http://www.sciencedirect.com/science/article/pii/S0370269312011975">http://www.sciencedirect.com/science/article/pii/S0370269312011975</a><br>
<br>
* Model-independent approach to eta -->pi+pi-gamma and
eta'-->pi+pi-gamma, F. Stollenwerk et al., Physics Letters B
707 (2012) 184-190 . <br>
<a class="moz-txt-link-freetext"
href="http://arxiv.org/abs/1108.2419">http://arxiv.org/abs/1108.2419</a><br>
<br>
Exclusive measurement of the eta --> pi+pi-gamma decay, P.
Adlarson et al. (WASA-at-COSY Collaboration), Physics Letters B
707 (2012) 243-249. <a class="moz-txt-link-freetext"
href="https://arxiv.org/abs/1107.5277">https://arxiv.org/abs/1107.5277</a><br>
<br>
* Measurement of the decay distribution of eta' --->pi+pi-gamma
and evidence of the box anomaly, A. Abele et al. (the Crystal
Barrel Collaboration), Physics Letters B 402 (1997) 195-206 . <a
class="moz-txt-link-freetext"
href="http://www.sciencedirect.com/science/article/pii/S0370269397004796"><a class="moz-txt-link-freetext" href="http://www.sciencedirect.com/science/article/pii/S0370269397004796">http://www.sciencedirect.com/science/article/pii/S0370269397004796</a></a>
<br>
<br>
Study of Dalitz Plot Distributions of the Decays
eta-->pi+pi-pi0 and eta-->pi+pi-gamma, J.G. Layter et al.,
Phys. Rev. D 7 (1973) p. 2565.<br>
<a class="moz-txt-link-freetext"
href="http://journals.aps.org/prd/abstract/10.1103/PhysRevD.7.2565">http://journals.aps.org/prd/abstract/10.1103/PhysRevD.7.2565</a><br>
<br>
There are some branching ratio studies done by CLEO (2009) and
BES2 (2005) which I have only skimmed. However, their S/B ratios
for eta'-->pi+pi-gamma were at least 10:1 at the time with good
statistics. This begs the question of where this study is headed:
to commission GlueX with a challenging decay branch?, define cuts
for a large eta' branch for potential use in the hybrid program?,
use this branch as one of several ways to measure the xsect or
Sigma asymmetry for eta' photoproduction?, attempt a competitive
Dalitz plot measurement?, ... all of the above? <br>
<br>
regards,<br>
<br>
Dave<br>
<br>
<br>
<br>
<br>
<br>
On 4/24/2016 2:59 PM, Zisis Papandreou wrote:<br>
</div>
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cite="mid:20022A47-7651-4637-AAFA-8BEE771D8469@uregina.ca"
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Hi folks:
<div class=""><br class="">
</div>
<div class="">we’ll have our next Eta/Eta-prime Working Group
meeting on Monday April 25 at 3pm EDT. The agenda is here:</div>
<div class=""><a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki-private/index.php/Eta/Eta-Prime_Meeting_2016-04-25"
class="">https://halldweb.jlab.org/wiki-private/index.php/Eta/Eta-Prime_Meeting_2016-04-25</a></div>
<div class=""><br class="">
</div>
<div class="">Cheers, Zisis...<br class="">
<div class="">
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<div class=""><font
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Dr. Zisis Papandreou</font></div>
<div style="color: rgb(0, 0,
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P.Phys.</font></span></div>
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