Opened 8 years ago
#940 new How to
Why I construct a wrong invariant mass?
Reported by: | Li Huang | Owned by: | |
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Priority: | minor | Milestone: | |
Component: | Delphes code | Version: | Delphes 3 |
Keywords: | Cc: |
Description
Hi,
I have a confusion. I don't find a linear collider card in Delphes3.3.2. So I use delphes_CMS.tcl for my work (e+ e- collider ). I calculate missing momentum by:
missing momentum = init momentum - visible momentum
And the visible momentum means everything in the EFlowTrack, EFlowNeutron and EFlowPhoton.
When I use this way to reconstruct Z ( Z decay into neutrino ). It's good. The invariant mass of reconstructed Z boson is around 90 GeV.
Then I changed the resolution formula for HCal and ECal and the B tagging efficiency. Then I find use above way to reconstruct Z lead a wrong result. The Z boson invariant mass is around 110GeV.
I am confused since I think my way to reconstruct Z boson is irrelevant to the Jet resolution or Jet energy scale or B tagging.
So, I have some questions:
- Why change the resolution formula and b tagging efficiency will lead a wrong Z boson invariant mass ( Z decay into neutrino and reconstructed using above way) ?
- Is there a ILC or CEPC card provided by Delphes?