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Re: WirepointHitPolicy detplane implementation [message #8132 is a reply to message #8129]

Mon, 23 March 2009 13:32

Anonymous Poster

From: *e18.physik.tu-muenchen.de

Hi Ola & Lia,

on second thought, I think it is necessary to have two hit policies for detectors which can measure a position along the wire and those which can not. The reason is the dimensionality of the hit. The DCH hit is only a 1-D information. There for the correct HMatrix (OK, this has nothing to do with the policy) would be 5x1 and would be [0,0,0,1,0] assuming that the U-vector points perpendicular to the wire, like it does.

Also in the policy, where you also fix the dimensionality when you calculate the hit coordinates and covariances this should be dont correctly.

It is true that just putting the coordinate to zero with a huge errors will lead to an unbiased fit, but the number of degrees of freedom for the chi2 calculation will be wrong.

If you dont have any objections I will introduce a new policy WireHitPolicy (without the point) which will do this correctly. I would then still ask you to check the detPlane() method for your choice of detector plane before you use it.

Does that make sense? Would you have some time to test this new implementation?

Cheers, Christian

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[Message index]

		WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 16 March 2009 13:55
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 16 March 2009 14:16
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Mon, 16 March 2009 15:42
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 16 March 2009 15:54
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Mon, 16 March 2009 16:16
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 16 March 2009 16:49
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Mon, 16 March 2009 18:31
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 16 March 2009 18:46
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Mon, 16 March 2009 19:09
		new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Anonymous Poster on Mon, 16 March 2009 23:10
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Lia Lavezzi on Tue, 17 March 2009 18:13
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Anonymous Poster on Tue, 17 March 2009 18:23
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Anonymous Poster on Wed, 18 March 2009 11:51
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Lia Lavezzi on Wed, 18 March 2009 13:23
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Anonymous Poster on Wed, 18 March 2009 13:37
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Lia Lavezzi on Wed, 18 March 2009 15:17
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Anonymous Poster on Wed, 18 March 2009 15:26
		Re: new in AbsTrackRep: extrapolateToLine and consequences on WirepointHitPolicy By: Lia Lavezzi on Wed, 18 March 2009 16:44
		Re: WirepointHitPolicy detplane implementation By: Aleksandra Wronska on Tue, 17 March 2009 10:21
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Tue, 17 March 2009 11:34
		Re: WirepointHitPolicy detplane implementation By: Aleksandra Wronska on Tue, 17 March 2009 11:53
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 16 March 2009 23:25
		changes in PndDchKalmanQA By: Anonymous Poster on Wed, 18 March 2009 15:32
		Re: changes in PndDchKalmanQA By: Anonymous Poster on Wed, 18 March 2009 16:13
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Wed, 18 March 2009 17:21
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Thu, 19 March 2009 13:35
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Thu, 19 March 2009 14:11
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Thu, 19 March 2009 16:42
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Thu, 19 March 2009 16:54
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Thu, 19 March 2009 16:56
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Thu, 19 March 2009 16:57
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Fri, 20 March 2009 12:58
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Fri, 20 March 2009 14:36
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Fri, 20 March 2009 18:11
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Fri, 20 March 2009 18:18
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Fri, 20 March 2009 20:28
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 23 March 2009 13:32
		Re: WirepointHitPolicy detplane implementation By: Aleksandra Wronska on Mon, 23 March 2009 13:39
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Mon, 23 March 2009 14:01
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 23 March 2009 15:33
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Mon, 30 March 2009 16:21
		Re: WirepointHitPolicy detplane implementation By: Aleksandra Wronska on Tue, 31 March 2009 08:16
		Re: WirepointHitPolicy detplane implementation By: Anonymous Poster on Wed, 01 April 2009 12:34
		Re: WirepointHitPolicy detplane implementation By: Lia Lavezzi on Mon, 23 March 2009 13:55

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