[Halld-physics] references for radiative eta(') decays

[Dave Mack]

Zisis et al,

Here's the references for radiative eta(') decays:

First check out Daniel Lersch's conference proceeding Figure 2 for an 
example of the split-off cut they used in WASA at COSY:
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).

A few other papers (putting * next to the two references that might 
represent the state of the art for the eta' Dalitz plot):

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. 
http://www.sciencedirect.com/science/article/pii/S0370269312011975

* Model-independent approach to eta -->pi+pi-gamma and 
eta'-->pi+pi-gamma, F. Stollenwerk et al., Physics Letters B 707 (2012) 
184-190 .
http://arxiv.org/abs/1108.2419

Exclusive measurement of the eta --> pi+pi-gamma decay, P. Adlarson et 
al. (WASA-at-COSY Collaboration), Physics Letters B 707 (2012) 243-249. 
https://arxiv.org/abs/1107.5277

* 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 . 
http://www.sciencedirect.com/science/article/pii/S0370269397004796

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.
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.7.2565

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?

regards,

Dave





On 4/24/2016 2:59 PM, Zisis Papandreou wrote:
> Hi folks:
>
> we’ll have our next Eta/Eta-prime Working Group meeting on Monday 
> April 25 at 3pm EDT.  The agenda is here:
> https://halldweb.jlab.org/wiki-private/index.php/Eta/Eta-Prime_Meeting_2016-04-25
>
> Cheers, Zisis...
>
> Dr. Zisis Papandreou
> Professor of Physics, Ph.D., P.Phys.
> ---------------------------------------------------------
> Department of Physics
> University of Regina
> 3737 Wascana Parkway
> Regina, SK S4S 0A2 CANADA
>
> *Phone: (306) 585-5379*
> Fax: (306) 585-5659
> Email: zisis at uregina.ca
> Website: 
> http://www.uregina.ca/science/physics/people/faculty-research/zisis-papandreou/index.html
>
>
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>
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