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

[Igor Strakovsky]

It was published back to 2014

On Thu, Aug 26, 2021 at 10:07 AM Susan Schadmand <s.schadmand at gmail.com>
wrote:

> 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=R08idtyP-rjDee4tnvXysSeDUgiz4P1mnTvPCP5HEaI&s=wUtq3aW-uhbNL851Sv0lsA6k-aA7vXnmbO14C2Uznyg&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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