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ParamFirst vs. ParamLast [message #9496]

Thu, 01 October 2009 16:52

Tobias Stockmanns
Messages: 489
Registered: May 2007

first-grade participant

From: *ikp.kfa-juelich.de

Dear pandaRooters,

I am playing at the moment with the PndLheKalmanTask and I realized the following problem:

I have simulated a K- and a pi+. After I have fitted the tracks with Genfit I get a PndTrack with the parameters of the track stored for the first and the last point of the track.

Unfortunately for many (but not all) tracks the momentum vector of the track at the beginning and at the end point into the opposite direction (see attached picture).

index.php?t=getfile&id=5654&private=0

Does someone of you have encountered a similar problem or knows, what the reason can be?

Cheers,

Tobias

By the way I am using revision 6386 of pandaRoot

Attachment: ProblemsParamFirstLast.jpg
(Size: 16.24KB, Downloaded 1443 times)

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Re: ParamFirst vs. ParamLast [message #9497 is a reply to message #9496]

Thu, 01 October 2009 18:00

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Hi,
try to use the last version of the trunk, this problem was fixed some time ago.

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Re: ParamFirst vs. ParamLast [message #9498 is a reply to message #9496]

Fri, 02 October 2009 09:15

asanchez
Messages: 350
Registered: March 2006

first-grade participant

From: *pools.arcor-ip.net

Hi Tobias, have you tried
to do the same but with
particles with the same charge, I mean,
both positive or negative.

Maybe there is a signature bug.

q/P, has to be multiplied again by the correct sign charge.???

if i well rememeber the default particle pid for the
start parameter of was a -211.

bet regards
alicia.

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Re: ParamFirst vs. ParamLast [message #9499 is a reply to message #9498]

Fri, 02 October 2009 09:25

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

I repeat,
the problem was already discussed here and fixed.

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Re: ParamFirst vs. ParamLast [message #9501 is a reply to message #9496]

Fri, 02 October 2009 11:42

Tobias Stockmanns
Messages: 489
Registered: May 2007

first-grade participant

From: *ikp.kfa-juelich.de

Hi Stefano,

thank you for your reply. You are right, the problem is solved with the latest revision of pandaRoot.

Next time I will have a more careful look on older forum messages.

Cheers,

Tobias

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