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I suggest first to look at a general definition of histogram, eg. in wikipedia:
The "nbins" parameter means the number of intervals (which we usually call bins) in which the total interval <xmin, xmax> will be divided. You can try to run your code with a small number of bins (eg. nbins=5) to see how this parameter is interpreted.
The number of entries represent the number of Fill() calls. In your case it should be equivalent to the number of entries in your hits collections. It need not to be the same as the number of particles which you shoot with /run/beamOn, but it depends on the way how you account your hits.