[Halld-pid-upgrade] Fwd: Re: thoughts after PID session [from Matt]

[Elton Smith]

-------- Original Message --------
Subject: 	Re: thoughts after PID session
Date: 	Mon, 8 Oct 2012 14:33:41 -0400
From: 	Matthew Shepherd <mashephe at indiana.edu>
To: 	Michael Williams <mwill at mit.edu>
CC: 	Curtis Meyer <cmeyer at cmu.edu>, Paul Mattione <pmatt at jlab.org>, 
"Meyer Curtis A." <curtis.meyer at cmu.edu>, "Ito Mark M." 
<marki at jlab.org>, "Eugene Chudakov" <gen at jlab.org>, Justin Stevens 
<jrsteven at mit.edu>, Yi Qiang <yqiang at jlab.org>, Elton Smith 
<elton at jlab.org>



On Oct 8, 2012, at 2:02 PM, Michael Williams wrote:

> Paul, did I hear correctly that material interactions are not included in the study so far?  Pretty important ... if not b/c of time constraints so far that's totally understandable ... but pretty important to have this in before making any decisions (or showing to any external people).

It depends... if we are going with either the LHCb or gas threshold design, we've studied all the material interactions that matter.  Both of these are outside the tracking volume so the only important thing is photon reconstruction efficiency in the forward calorimeter.  We have looked at this for those two designs.

Matt





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