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Re: Tracking: Kalman Task with STT,(electron hypo) [message #11397 is a reply to message #11396] Thu, 23 December 2010 13:30 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: *0-87-r.retail.telecomitalia.it
I still do not understand; let's forget about the tails, for the moment:

Muon: p_rec - p_mc narrower, p_rec - p_mv / sigma broader
EWlectrons: p_rec - p_mc broader, p_rec - p_mc / sigma narrower

->
Muons: sigma smaller
Electrons: sigma bigger

Muons have a better residulas, but small errors (why?)
Electrons have larger residuals, and larger errors.

I would suppose that errors for muons should be larger, and also the residuals, considering that this is the wrong hypothesis. Electrons should fit better the points, with a reduced residual and properly calculated errors. But this does not appear.

I continue to think that there is something wrong somewhere for electrons.
Let's remember that track parameters are used not only for kinematical fit, but also for pid and for correlation, where we do not need covariance matrix.
 
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