Uncommon Eta Distribution in Sherpa Analysis Package

[quatuor@physik.uni-wuppertal.de]

Dear Sherpa Authors,

I was using the Sherpa Analysis Package to get the Eta distribution of all electrons (at least I thought it was all electrons) using

Eta 11 -10. 10. 100 LinErr FinalState

Eta -11 -10. 10. 100 LinErr FinalState

in the Analysis.dat

It turned out that the Analysis Package histograms only the most energetic e+ and e- per event. What results in one secondary e+ being histogrammed in a W- events and the other way around. (Checked by event per event analysis and histogram comparison).

This behaviour occured when analysing a sample with 93 93 -> 13 -14 93{3} and 93 93 -> -13 93{3}

Is there a way to get either all electrons or only the primary ones? And perhaps the PT distribution shows the same behaviour?

Best regards Eva-Lotte Quatuor

[Frank Siegert]

Hi Eva-Lotte,

yes, this behaviour is known. I am not aware of any way to get only the primary electrons. What you could do, is to apply an analysis cut to your electrons (using the Trigger command), where you could try to cut away all secondary (soft) electrons.

This is a short-coming of our internal analysis package, but since you are probably only using that for validation (?), wouldn't it be just fine for you to use only W+ or W-?

Frank

[Stefan Hoeche]

Milestone old deleted