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Modifications in Kalman [message #14510]

Mon, 18 March 2013 17:49

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Dear all,
I have added inside the PndRecoKalmanTask the possibility to switch ON/OFF the back propagation of the track parameters from the first point of the track to the Interaction Point (at present this is done always), before the fit.

This can be done in the reco macro, with the function:

PndRecoKalmanTask::SetPropagateToIP(kTRUE/kFALSE);

This can be useful for the FTS tracking standalone.
it would be interesting to study the difference in performances with and without the backpropagation.

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Re: Modifications in Kalman [message #14513 is a reply to message #14510]

Tue, 19 March 2013 10:40

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Hi,
I have also added the possibility to use as initial detector plane for the kalman the plane perpendicular to the track, instead of the old vertical plane XY.
This can be switched with the function:

PndRecoKalmanTask::SetPerpPlane(kTRUE/kFALSE);

I have not changed the default settings of these two new options. This means that all the reco macros will work in the same way as before, if you don't add the function calls.

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Re: Modifications in Kalman [message #14514 is a reply to message #14513]

Tue, 19 March 2013 13:52

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Hi,
I checked the differences for momentum recosntructions, using 10k muons at 0.5 GeV/c in the barrel.

This the comparison w/ (blue) and w/o (red) backward propagation to the IP:

index.php?t=getfile&id=7305&private=0

This the comparison with the standard initial plabe (blue) and with the perpendicular plane (red)

index.php?t=getfile&id=7306&private=0

It appears evident that the orientation of the plane does not affect teh results, while w/o back propagation the counts are less. The latter point is not well understood by me.

Attachment: res_ip.gif
(Size: 7.23KB, Downloaded 1115 times)
Attachment: res_perp.gif
(Size: 7.19KB, Downloaded 1108 times)

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