[Halld-offline] [Halld-physics] New CDC dE/dx Cut

[Paul Mattione]

When I wrote it I wasn't thinking about antiprotons at all, I just wanted something quick and simple for proton/pion that I could share with everyone.  

I'm hesitant to modify my example code for pbar since so few people are looking at it: I don't want them to accidentally cut away their pi- signal.  You guys however are free to do whatever you want.  

Only two lines of code were added: the if-statement checking if the dE/dx was zero (and the following return).  The cuts also got looser though.   Feel free to update your own version.

----- Original Message -----
From: "Reinhard Schumacher" <schumacher at cmu.edu>
To: "halld-physics at jlab.org Physics" <halld-physics at jlab.org>, "HallD Software Group" <halld-offline at jlab.org>, "Paul Mattione" <pmatt at jlab.org>
Cc: "Viren Bajaj" <vbajaj at andrew.cmu.edu>
Sent: Thursday, July 21, 2016 8:43:54 AM
Subject: Re: [Halld-physics] New CDC dE/dx Cut

Hi Paul,

It looks like this piece of code applies dE/dx cuts to positive tracks 
only.   Student Viren Bajaj and I are interested in separating out the 
anti-protons from the negative pions.  We changed our own code to do 
this, but now we have to again change your new code.   Is there some 
reason your version does not act on negative particles, and if not, can 
you have it treat positive and negative tracks equally?

Reinhard

____________________________________________________________________
Reinhard Schumacher         Department of Physics, 5000 Forbes Ave.
Carnegie Mellon University, Pittsburgh, PA 15213, U.S.A.
phone: 412-268-5177         web: www-meg.phys.cmu.edu/~schumach
____________________________________________________________________

On 7/20/16 11:51 PM, Paul Mattione wrote:
> Hey guys, Justin found a bug in my CDC dE/dx custom action: It was accidentally cutting some fast protons.  A fixed version (with very loose cuts) can be found at:
>
> https://halldsvn.jlab.org/repos/trunk/home/pmatt/plugins/klambda/DCustomAction_dEdxCut.cc
>
> If you’re cutting on the CDC dE/dx in JANA, please make sure to use the updated code.  Thanks.
>
>   - Paul
>
>
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