[Halld-cal] Shower Quality Cut

[Georgios Vasileiadis]

Dear Rebecca and Matt,

During yesterday's eta/eta' meeting we discussed the Shower Quality cut 
and how it affects the eta pi+ pi- and eta pi0 pi0 final states. I put 
together some slides in order to show you the result of using this cut 
in my analyses. As you can see in the attached slides, this cut is very 
efficient for the eta pi+ pi- final state (I think the algorithm was 
trained using the very similar reaction omega -> pi+ pi- pi0). However, 
it is disastrous for the eta pi0 pi0 final state (6 photons and no 
charged tracks, besides the recoiling proton). Some details on the 
application of the cut:

a) A combo is cut even if just one of the photons fails the cut

b) I didn't check whether the showers end up in the FCAL or the BCAL, 
prior to applying the cut

Given the above, I would like to ask you:

1) Can this cut be used for final states with only neutral particles?

2) Should I be checking for the location of the shower (FCAL/BCAL) 
before using this cut (i.e. apply it ony to FCAL showers)?


Thank you in advance,
George


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