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Opened 9 years ago

#940 new How to

Why I construct a wrong invariant mass?

Reported by: Li Huang Owned by:
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:

  1. 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) ?
  1. Is there a ILC or CEPC card provided by Delphes?

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