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Reco Hit for TpcCluster [message #8293]

Fri, 24 April 2009 12:44

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Hello,
when I have started to write the Kalman Task starting from lhetrack, I have found that the only TPC RecoHit available was TpcPlanarRecoHit, and I have used it with some modification to include even the GeaneTrackRep (PndLheTpcPlanarRecoHit)
.
I can see that in the repository there is also PndTpcSPHit, which constructs a recohit starting from the TpcCluster.

My question is, which is the "recomennded" recohit to use for tpc? Planar or SP ?

Thanks a lot.

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Re: Reco Hit for TpcCluster [message #8295 is a reply to message #8293]

Fri, 24 April 2009 13:44

Sebastian Neubert
Messages: 282
Registered: March 2006
Location: Munich

first-grade participant

From: *natpool.mwn.de

Hi Stefano!

Take the SpacePoint hit!

Cheers! Sebastian.

Sebastian Neubert
Technische Universität München
Department Physik E18
sneubert@e18.physik.tu-muenchen.de
tel: +49-8928912592

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Re: Reco Hit for TpcCluster [message #8306 is a reply to message #8295]

Mon, 27 April 2009 10:59

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Hi,
I have compared the results of genfit using tpc+mvd, 1000 muons at 1GeV/c.
Here you are the momentum distributions, with the two different RecoHits:

index.php?t=getfile&id=5294&private=0

The results are quite stable, if I fit the two peaks with a gaussian from 0.9 to 1.1, I obtain:

Planar: sigma 10.5 MeV/c, chi2/ndf = 1.3
SPHit: sigma 10.2 MeV/c, chi2/ndf = 1.5

Let's say they are almost comparable.
However, I will commit the code using the official PndTpcSPHit.

Attachment: recohit_comp.gif
(Size: 12.20KB, Downloaded 1020 times)

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