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- Johan algorithm works fine!
- Clusters with at least one ghost-tagged xtal tend to have large overlay energy.
- Only in one case the overlay energy is 0 and there is some ghost-tagged xtal (mostly connected to the energy threshold). The 'purity' of such selection is ~1.
- Efficiency is low. We can't tag a good fraction of ghost clusters in this way. (this was my impression before looking at periodic. In AG there is no energy selectionjust the energy dependence of the efficiency, no request on min overlay energy here)
- There are few events with low overlay energy and low ghost-tagged energy. After looking at event displays I think we can consider good cluster is the ghost-tagged energy is <~3%
- My suggestion for ghost tagging ghost clusters is "TagGhostNumXtals>0 && (TagGhostRawEnergySum/CalRawEnergySum)> 0.03"
- This is valid for permissive E >= 105 MeV.
- We can include this algorithm just after clustering, and then tag ghost clusters. Not sure how we should use this info:
- Select best cluster only if non ghost-tagged - what happen if the best cluster is also a ghost (i.e. there are no other options?)?
- Use this info in tracking ( e.g. knowing that the direction is likely to be wrong). Need Tracy here...
- Use in event-level analysis to select events with useless cal information (and treat them as tracker only if possible)
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