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Re: Momentum resolution and reconstruction efficiency of LHE tracking [message #10183 is a reply to message #10181] Thu, 11 February 2010 15:19
 Lia Lavezzi Messages: 291Registered: May 2007 Location: Torino first-grade participant From: *pv.infn.it
Hi Alicia,
the cut for low momentum particles was put there because of some instabilities of GEANE for low momenta, but in principle GEANE can propagate also low momentum particles.
I will make some tests removing the cut to see what happens and to fix the crashes if/when they happen. Unfortunately I am working on several other things at the moment and I have to postpone a little this investigation (sorry!).
 Quote: Nevertheless even if the particle is losing energy geane should be able to take care of that? or am i wrong? So far i know instead of a helix, geane considers then a parabola(x,y,dx/dz,dy/dz).

Yes, GEANE follows the particle while it loses energy. The trajectory of the particle is made by pieces of helix (in each step GEANE tracks with an helix, but the different helices can have different radius of curvature, for example, to take care of the energy loss).
With GEANE you don' t have the track as a whole helix with fixed radius of curvature.

Concerning the "parabola", it is just a track representation (the parameters used to describe the track are the ones you wrote). You always can convert it to the helix parameters, but the important thing is that you have the description of the track in one point and the parameters don' t stay constant along the helix (while if you use the helix fit you have that the momentum, and so the radius, is constant along the track).

Ciao,
Lia.

 Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Wed, 10 February 2010 19:21 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Wed, 10 February 2010 21:05 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Gianluigi Boca on Wed, 10 February 2010 23:18 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Johan Messchendorp on Wed, 10 February 2010 23:49 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 00:21 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Johan Messchendorp on Thu, 11 February 2010 00:30 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 07:47 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Johan Messchendorp on Thu, 11 February 2010 09:47 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 10:05 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Thu, 11 February 2010 10:43 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 11:05 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Thu, 11 February 2010 11:15 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 11:20 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 12:49 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Thu, 11 February 2010 14:22 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: asanchez on Thu, 11 February 2010 14:34 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: asanchez on Thu, 11 February 2010 14:49 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Lia Lavezzi on Thu, 11 February 2010 15:19 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: asanchez on Thu, 11 February 2010 15:35 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Anonymous Poster on Thu, 11 February 2010 15:46 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Alberto Rotondi on Thu, 11 February 2010 18:51 Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Gianluigi Boca on Sat, 13 February 2010 23:06
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