[Halld-cal] Shower Quality Cut

[Colin Gleason]

Sent from a wrong email, so I apologize if you get this twice:

George,

Here's my 2 cents:

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

Yes, it can.

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)?
>

The cut is only applied to FCAL showers. It was not trained for the BCAL.
All BCAL showers currently get a score of 1.

One suggestion I have would be to look at this variable and its efficiency
in both signal MC and bggen. The 0.5 is just an initial recommendation
based off Rebecca's efficiency study with omega MC and data. Since the
quality score is channel specific, you should try to study the efficiency
of this cut for your eta pi0 pi0 channel.

On Tue, Jul 16, 2019 at 9:41 AM Colin Gleason <gleasonc609 at gmail.com> wrote:

> George,
>
> Here's my 2 cents:
>
> 1) Can this cut be used for final states with only neutral particles?
>
> Yes, it can.
>
> 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)?
>>
>
> The cut is only applied to FCAL showers. It was not trained for the BCAL.
> All BCAL showers currently get a score of 1.
>
> One suggestion I have would be to look at this variable and its efficiency
> in both signal MC and bggen. The 0.5 is just an initial recommendation
> based off Rebecca's efficiency study with omega MC and data. Since the
> quality score is channel specific, you should try to study the efficiency
> of this cut for your eta pi0 pi0 channel.
>
> On Tue, Jul 16, 2019 at 7:18 AM Georgios Vasileiadis <gvasil at jlab.org>
> wrote:
>
>> 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
>>
>>
>> _______________________________________________
>> Halld-cal mailing list
>> Halld-cal at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/halld-cal
>
>
>
> --
> Colin Gleason
> Postdoctoral Fellow
> Indiana University
> Department of Physics
>


-- 
Colin Gleason
Postdoctoral Fellow
Indiana University
Department of Physics
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