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Re: Error Using LCIOWriter [message #1926 is a reply to message #1925] Mon, 05 April 2010 16:45 Go to previous message
Messages: 3
Registered: December 2008
I am organizing the MCParticles in each event into BHadrons and their primary decay products. Then using a covariance matrix to calculate the Impact Parameter Significance of each BHadron. Recently I was informed the vertexing code I will be using is written in C++. For convenience I though I could save the organisation I had already accomplished in a lcio formatted file. I was trying to add the list of BHadrons to the EventHeader:
event.put("BHadron", bhMCPList);

Again this worked for majority of the events. Except random events are being reported as NullPointerExceptions when I read the lcio file in jas3. I was also planning to save the Significance of each BHadron in MetaData but haven't got around to trying that. Hope this is clear.

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