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Re: GEM tracking [message #8307 is a reply to message #8227]

Mon, 27 April 2009 11:56

Anonymous Poster

From: *natpool.mwn.de

Hi Radek,

I think you did it correctly. But I was wondering, why you do this rotation in the first place? The GEM measures in two strip projections, and it is in these direction, that you determine your detector resolutions. So, I would recommend to use the strip directions for determining the u and v vectors. Ans then your hit coordinates are just translated from the strips which fired. In the rotated case, correctly determining the hit covariance matrix is more difficult. For sure you wont have a diagonal matrix...

Concerning the 1D vs. 2D discussion: You can of course use the 2D information, there is no problem with that.

Did you obtain some results yet? If you do a gaussian smearing for your hits with known resolution, you should obtain correct pull and chi2 distributions. How does that look?

Cheers, Christian

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[Message index]

		GEM tracking By: Radoslaw Karabowicz on Tue, 14 April 2009 13:09
		Re: GEM tracking By: Anonymous Poster on Tue, 14 April 2009 17:51
		Re: GEM tracking By: Radoslaw Karabowicz on Tue, 14 April 2009 18:06
		Re: GEM tracking By: Ralf Kliemt on Wed, 15 April 2009 11:47
		Re: GEM tracking By: Anonymous Poster on Wed, 15 April 2009 13:01
		Re: GEM tracking By: Radoslaw Karabowicz on Wed, 15 April 2009 16:03
		Re: GEM tracking By: Anonymous Poster on Mon, 27 April 2009 11:56
		Re: GEM tracking By: Radoslaw Karabowicz on Tue, 28 April 2009 18:11
		Re: GEM tracking By: StefanoSpataro on Tue, 28 April 2009 18:22
		Re: GEM tracking By: Radoslaw Karabowicz on Wed, 29 April 2009 09:55
		Re: GEM tracking By: Radoslaw Karabowicz on Wed, 29 April 2009 11:51
		Re: GEM tracking By: Radoslaw Karabowicz on Thu, 30 April 2009 11:55
		Re: GEM tracking By: StefanoSpataro on Thu, 30 April 2009 12:11
		Re: GEM tracking By: Anonymous Poster on Thu, 30 April 2009 12:12
		Re: GEM tracking By: Radoslaw Karabowicz on Thu, 30 April 2009 15:52
		Re: GEM tracking By: Anonymous Poster on Thu, 30 April 2009 18:26
		Re: GEM tracking By: Radoslaw Karabowicz on Thu, 04 June 2009 18:10
		Re: GEM tracking By: Radoslaw Karabowicz on Thu, 25 June 2009 16:22
		Re: GEM tracking By: Johan Messchendorp on Fri, 26 June 2009 08:53

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