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Re: Access to EventHeader. after Digitization [message #19944 is a reply to message #19941]

Wed, 23 November 2016 13:03

Tobias Stockmanns
Messages: 489
Registered: May 2007

first-grade participant

From: *ikp.kfa-juelich.de

Dear Michael,

the difference between the number of events in simulation, digitization and reconstruction is not surprising. The simulation file is identical in TimeBased and EventBased simulation, so you have here the number of events you have simulated. In the digitization stage the ordering of the digi stream is randomized depending on your detector and afterwards sorted by the TimeStamp. The digis of one event are not longer in the same entry as in the simulation and they can be completely mixed up. The last entry in the digitization file contains all data of the sorter which has not finished sorting before the last event happend.

The number of events in the reco file can be anything from 1 to (almost) infinity. It only depends on the way you take the data from the digi file via the GetData method. You can have less events if you have events merged together or more, if one event is split into many "pseudo-events".

Cheers,

Tobias

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[Message index]

		Access to EventHeader. after Digitization By: Dominik Steinschaden on Fri, 27 May 2016 15:16
		Re: Access to EventHeader. after Digitization By: StefanoSpataro on Fri, 27 May 2016 17:00
		Re: Access to EventHeader. after Digitization By: Dominik Steinschaden on Tue, 31 May 2016 15:48
		Re: Access to EventHeader. after Digitization By: Michael Papenbrock on Thu, 17 November 2016 13:18
		Re: Access to EventHeader. after Digitization By: Radoslaw Karabowicz on Thu, 17 November 2016 15:11
		Re: Access to EventHeader. after Digitization By: Michael Papenbrock on Thu, 17 November 2016 15:18
		Re: Access to EventHeader. after Digitization By: Radoslaw Karabowicz on Sat, 19 November 2016 12:15
		Re: Access to EventHeader. after Digitization By: Michael Papenbrock on Mon, 21 November 2016 10:05
		Re: Access to EventHeader. after Digitization By: Radoslaw Karabowicz on Mon, 21 November 2016 18:08
		Re: Access to EventHeader. after Digitization By: Michael Papenbrock on Tue, 22 November 2016 11:33
		Re: Access to EventHeader. after Digitization By: Radoslaw Karabowicz on Tue, 22 November 2016 16:38
		Re: Access to EventHeader. after Digitization By: Michael Papenbrock on Wed, 23 November 2016 12:30
		Re: Access to EventHeader. after Digitization By: Tobias Stockmanns on Wed, 23 November 2016 13:03
		Re: Access to EventHeader. after Digitization By: Radoslaw Karabowicz on Thu, 24 November 2016 09:06
		Re: Access to EventHeader. after Digitization By: Michael Papenbrock on Thu, 24 November 2016 10:33

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