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Re: vertex reconstruction without fitting? [message #17476 is a reply to message #17474]

Sat, 08 November 2014 16:46

Klaus Götzen
Messages: 293
Registered: June 2006
Location: GSI

first-grade participant

From: *adsl.alicedsl.de

Hi Anna,

just to make it clear: a single track (=charged particle) cannot have a reconstructed vertex (or origin), since tracking only determins the trajectory (helix) of a charged particle, but not the starting point of the track on that helix. A vertex information can only be assigned by combining it with at least a second track and the constraint, that both particles originate from the same point.

If you want to know the POCA to the IP of the reco track, you can also use

muons[i]->Pos();

As Stefano wrote (I was just typing when he answered Wink

), unit is cm.

Best,
Klaus

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[Message index]

		vertex reconstruction without fitting? By: AnnaSkachkova on Fri, 07 November 2014 19:12
		Re: vertex reconstruction without fitting? By: Ralf Kliemt on Fri, 07 November 2014 20:29
		Re: vertex reconstruction without fitting? By: AnnaSkachkova on Sat, 08 November 2014 15:25
		Re: vertex reconstruction without fitting? By: Klaus Götzen on Sat, 08 November 2014 15:41
		Re: vertex reconstruction without fitting? By: AnnaSkachkova on Sat, 08 November 2014 16:40
		Re: vertex reconstruction without fitting? By: StefanoSpataro on Sat, 08 November 2014 16:44
		Re: vertex reconstruction without fitting? By: Klaus Götzen on Sat, 08 November 2014 16:46
		Re: vertex reconstruction without fitting? By: AnnaSkachkova on Sat, 08 November 2014 17:02
		Re: vertex reconstruction without fitting? By: Klaus Götzen on Sat, 08 November 2014 17:06
		Re: vertex reconstruction without fitting? By: AnnaSkachkova on Sat, 08 November 2014 17:08

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