[Halld-cal] Preshower information in BCAL showers

[Lubomir Pentchev]

Christina, thanks for your support. I like the idea to use it also for e/gamma separation. It can help to estimate our tracking efficiency, so far we have only a very rough idea what it is. 

Lubomir

----- Original Message -----
From: "Christina Kourkoumeli" <hkourkou at phys.uoa.gr>
To: halld-cal at jlab.org
Sent: Thursday, August 25, 2016 2:50:17 PM
Subject: Re: [Halld-cal] Preshower information in BCAL showers

Hi all, 
I second the voices expressed for the change. Both ATLAS and CMS us epreshowers and they are very helpful in e/pi separation and even in some cases of e/gamma separation when the track of the electron for some reason or other is not there. 
Cheers, 
Christine 
On 25/8/2016 9:23 μμ, Mark Macrae Dalton wrote: 


Hi all, 

There is a proposal to alter the DBCALShower object to add an additional piece of information for each shower, this being the energy deposited in the first layer. The idea is to use this energy as “preshower" information to help with particle identification. The proponents desire to have this included in the next analysis launch which goes next week. No specific studies have yet been done to predict the effectiveness of this in our case, but in general it is a useful technique. 

Implementing this would require a change to the REST data format to accommodate the new data member. This would essentially be a permanent change for reasons of backwards compatibility. These kinds of changes therefore require some amount of consensus. So, here is your opportunity to comment. 

Best, 
Mark Macrae Dalton 





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