[Jef] [EXTERNAL] eta->pi0gg background from eta->gg, eta->3pi0

[Igor Strakovsky]

Ig,

The key person in this analysis is Sergey Prakhov and we have different
paper for omega photoproduction at MAMI
(attached)


On Thu, Aug 26, 2021 at 10:22 AM Igal Jaegle <ijaegle at jlab.org> wrote:

> Thank you, Susan, that is really helpful. They do not mention and observe
> any omega background!
>
> tks ig.
> ------------------------------
> *From:* Jef <jef-bounces at jlab.org> on behalf of Susan Schadmand <
> s.schadmand at gmail.com>
> *Sent:* Thursday, August 26, 2021 10:01 AM
> *To:* jef at jlab.org <jef at jlab.org>
> *Subject:* [Jef] [EXTERNAL] eta->pi0gg background from eta->gg, eta->3pi0
>
> There might be something useful in the A2 paper, see
> https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_pdf_1405.4904.pdf&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=JOJ62NEwwkI7R0M2R59fbQ&m=2cqMRoHIKJDWYoG0sXkNTK8QTKGBWp2iGBwLkgZxY44&s=4uYJtNbCX3zqNCJ4OBzGnEEmqFYeq8ylNKusNEH72YY&e= 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_pdf_1405.4904.pdf&d=DwMCaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=JOJ62NEwwkI7R0M2R59fbQ&m=5Y7472olvxXv6Sd2q8sF8W26idKXgIvLAMwmtRvD4Go&s=KfiAGstPDb0aCDfflS4VlAXi4oKW2L-lrTxXtRyBPDk&e=>
> :
>
> contribution to eta->pi0gg from eta->gg decay:
>
>    - due to split offs from both outgoing photons
>    - they cut on the smaller values of the two possible invariant masses
>    m(pi0gg)
>    - (this is a way of cutting on gg opening angles)
>
> contribution to eta->pi0gg from eta->3pi0 decay:
>
>    - showers of some outgoing photons overlap (or are not detected)
>    - they cut on an "effective radius" of the clusters to suppress the
>    case of overlapping
>    - (this is a simple cut on cluster shape)
>
>
>
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