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

[Igal Jaegle]

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://arxiv.org/pdf/1405.4904.pdf<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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