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Re: Loss of efficiency for electrons at theta~22^deg, due to association failure in EMC [message #17954 is a reply to message #17936] Fri, 27 February 2015 12:04 Go to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: *to.infn.it
Oct14 suffers for a problem of MC truth for the neutrals, but apart from this the release is fine.
All the lines you write come from geometrical considerations:

if ( (emcModule<3) && (helix->GetZ()>150.)  ) continue; // not consider tracks after emc barrel for BARREL


If the position of the last hit is in the GEMS then most probably the will not hit the barrel, then skip this correlation

if ( (emcModule==3) && (helix->GetZ()<165.) ) continue; // consider tracks only from last gem plane for FWD


Consider only the tracks with are using the last GEM plane for the propagation to the forward endcap.

if ( (emcModule==4) && (helix->GetZ()>-30.) ) continue; // consider tracks only ending at the back of STT for BKW


If the last hit is not in the negative Z then it will not go to the backward endcap.

In theory, all these conditions make sense. BUT, maybe, if you suffer from a lack of counts for module 3, the 2nd command is somehow wrong, maybe not all the tracks hit the last plane of the GEM (problems in tracking). It could make sense to check the geometry of not GEMs and EMC to see how far we are in this "edge" region of 22°.
 
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