GSI Forum
GSI Helmholtzzentrum für Schwerionenforschung
Home » PANDA » PandaRoot » Tracking » GENFIT for transverse momenta < 200 GeV/c strange?!
Re: GENFIT for transverse momenta < 200 GeV/c strange?! [message #11199 is a reply to message #11194] Thu, 18 November 2010 15:11 Go to previous messageGo to previous message
Jens Sören Lange is currently offline  Jens Sören Lange
Messages: 193
Registered: June 2005
first-grade participant
 From: *kek.jp
Yeah, so, "helix fit is better" means, that "no energy loss correction at all is better than energy loss correction in genfit", but only for pT=100 MeV. I really don't know. Maybe at theta=60^o particles the path length in the MVD material is so extended that they are loosing almost all their energy (helix phase is short so maybe passing a few times through material).

In addition, pT=100 MeV is already in the highly rising Bethe-Bloch part, so maybe the dE/dx correction (which the Kalman is trying to do) is not correct. The error is large.

Anyway, you can see that tracking efficiency from pT=200 GeV/c to pT=100 GeV/c drops by factor ~2 (~9000 -> ~3000) so I think it is also another effect, maybe short tracks.

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: ROOT based track follower discussion.
Next Topic: Lhe tracking results: reconstruction error for transverse momenta <= 1 GeV/c, all five particles
Goto Forum:
  

[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Fri Jan 24 23:48:35 CET 2025

Total time taken to generate the page: 0.00985 seconds
.:: Contact :: Home :: Legal Notice :: Data Protection Policy ::.

Powered by: FUDforum 3.1.3.
Copyright ©2001-2023 FUDforum Bulletin Board Software