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Re: EvtGen Lumi Theta-Distribution [message #10312 is a reply to message #10268]

Thu, 25 February 2010 18:56

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Hi,
I have done some tests.
The problems are coming from EvtGen. I have run 100k events of J/Psi, and I have seen that in the output files there are 14 events with a track with exactly Pz = 15.46610609!!!! (but different px/py).

This means that it does not depend on pandaroot but only in evtgen. It sounds weird also the fact that only in Pz this problem appears, while Px and Py have smooth distributions.

I could think that the problem is coming from the random generator, or... no idea!!

I would like to ask to people doing analysis if they have found this kind of problem in other channels (maybe a problem of the PHSP model?). You have only to take your primary tracks, plot Pz in a very narrow window and to check the distribution.

And, if somebody is using a random generator different from the EvtGen one, this check could be also helpful.

Waiting for some feedback...

Ste

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[Message index]

		EvtGen Lumi Theta-Distribution By: Mathias Michel on Tue, 16 February 2010 11:50
		Re: EvtGen Lumi Theta-Distribution By: StefanoSpataro on Tue, 16 February 2010 12:02
		Re: EvtGen Lumi Theta-Distribution By: Mathias Michel on Tue, 16 February 2010 12:36
		Re: EvtGen Lumi Theta-Distribution By: StefanoSpataro on Tue, 16 February 2010 12:55
		Re: EvtGen Lumi Theta-Distribution By: Mathias Michel on Tue, 16 February 2010 13:44
		Re: EvtGen Lumi Theta-Distribution By: Mathias Michel on Wed, 17 February 2010 10:20
		Re: EvtGen Lumi Theta-Distribution By: StefanoSpataro on Wed, 17 February 2010 11:20
		Re: EvtGen Lumi Theta-Distribution By: Mathias Michel on Wed, 17 February 2010 14:08
		Re: EvtGen Lumi Theta-Distribution By: Mathias Michel on Mon, 22 February 2010 08:53
		Re: EvtGen Lumi Theta-Distribution By: StefanoSpataro on Mon, 22 February 2010 12:26
		Re: EvtGen Lumi Theta-Distribution By: Mathias Michel on Tue, 23 February 2010 12:37
		Re: EvtGen Lumi Theta-Distribution By: StefanoSpataro on Thu, 25 February 2010 18:56
		Re: EvtGen Lumi Theta-Distribution By: Stefan Pflueger on Tue, 04 September 2012 11:00

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