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Re: Tracking: Kalman Task with STT,(electron hypo) [message #11396 is a reply to message #11394]

Thu, 23 December 2010 13:07

Lia Lavezzi
Messages: 291
Registered: May 2007
Location: Torino

first-grade participant

From: *pv.infn.it

Hi Stefano,

Quote:

the "right" choice is electron only if you consider a mathematical point of view... in analysis we need a better momentum reconstruction and from plots I would use muon hypothesis to have a better invariant mass peak. And it would be interesting to know why the momentum is much better in this case. Maybe also a plot of chi2/ndf would be interesting.

But consider the kinematic fit: you have to give also the covariance matrix as input there, and with the muon hypo for a "true" electron it is clearly wrong (see the pull distribution), so you will not get good results with it. Probably with the electron hypo and the good covariance matrix the result will be better.

If the pull is wrong, then the result is not reliable... ok, that should come out also from the chi2...
Lia.

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[Message index]

		Tracking: Kalman Task with STT,(electron hypo) By: M.Babai on Tue, 21 December 2010 11:47
		Re: Tracking: Kalman Task with STT,(electron hypo) By: StefanoSpataro on Tue, 21 December 2010 12:03
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Anonymous Poster on Tue, 21 December 2010 12:11
		Re: Tracking: Kalman Task with STT,(electron hypo) By: M.Babai on Tue, 21 December 2010 12:20
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Lia Lavezzi on Tue, 21 December 2010 12:42
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Lia Lavezzi on Tue, 21 December 2010 19:46
		Re: Tracking: Kalman Task with STT,(electron hypo) By: StefanoSpataro on Tue, 21 December 2010 19:52
		Re: Tracking: Kalman Task with STT,(electron hypo) By: M.Babai on Tue, 21 December 2010 12:11
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Ronald Kunne on Wed, 22 December 2010 09:58
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Lia Lavezzi on Wed, 22 December 2010 18:22
		Re: Tracking: Kalman Task with STT,(electron hypo) By: M.Babai on Thu, 23 December 2010 10:32
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Lia Lavezzi on Thu, 23 December 2010 13:01
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Jens Sören Lange on Thu, 23 December 2010 14:05
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Lia Lavezzi on Thu, 23 December 2010 21:54
		Re: Tracking: Kalman Task with STT,(electron hypo) By: StefanoSpataro on Thu, 23 December 2010 12:57
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Lia Lavezzi on Thu, 23 December 2010 13:07
		Re: Tracking: Kalman Task with STT,(electron hypo) By: StefanoSpataro on Thu, 23 December 2010 13:30
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Jens Sören Lange on Thu, 23 December 2010 22:57
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Lia Lavezzi on Fri, 24 December 2010 12:06
		Re: Tracking: Kalman Task with STT,(electron hypo) By: Alberto Rotondi on Fri, 24 December 2010 14:14

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