[Hallc_sidis_analysis] Fwd: hgcer efficiency

[Dave Gaskell]

Hi everyone -

Attached is a plot of the heavy gas Cerenkov efficiency as a function of 
SHMS central momentum (courtesy of Abishek).   With the technique he 
used here, there could be a little pion contamination remaining in the 
sample, so the true efficiency could be a little higher.  I think the 
main points are:

1. The efficiency for electrons is high (at least 99%) for a cut of npe>2
2. It is pretty much independent of momentum

Cheers,
Dave



-------- Forwarded Message --------
Subject: 	hgcer efficiency
Date: 	Wed, 3 Oct 2018 14:06:53 -0400 (EDT)
From: 	Abishek Karki <abishek at jlab.org>
To: 	Dave Gaskell <gaskelld at jlab.org>



Hi Dave,

Attached is the plot of hgcer efficiency. Here I was selecting my sample i.e should by putting cal>0.9 && cer>2 and my did by
putting cal>0.9 && cer>2 && hgcer>2 . I used carbon rum from each momentum setting to get this efficiencies.

Please let me know if I need to do something more.

Yours,
Abishek

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