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Questions to be handled in the User Support Q&A sessions

The next session will take place on Tuesday, July 25th, at 9:30 am. in 40-RA-10. Please add your question here using the following format (you can edit this page by clicking on the Edit button top right). Please note that you are kindly asked to write down the answer to your question after the session.


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How to save cross section in the root file?

Sami Lehti, 21 Jul 2006

In an analysis containing several channels (signal+backgr), it is very helpful if some normalization constants, like cross section and preselection efficiency, can be stored in the root file. How is this done in practise (a working example would be nice)? How is the cross section read from the root file? Can the stored cross section be changed by hand afterwards? For example if i have 1M events in root file(s), and i get a new cross section from theorists, do i have to rerun the 1M events, or can i change the cross section value in the root file(s)? If yes, how?

-- KatiLassilaPerini - 13 Jul 2006

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Topic revision: r5 - 2006-07-21 - SamiLehti

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