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Tune QEE high-pT and high-mass muon lines for 2025

Ross John Hunter requested to merge rjhunter-qee-muon-line-tuning into qee_upgrade

FYI @lugrazet @isanders @paandreo @mvesteri

Changes aimed at reducing the rates to disk of the precision EW programme in QEE for 2025.

  • Add a loose isolation cut to SingleHighPtMuon sprucing line,
  • Do same to SingleHighPtMuonNoMuID, and tighten pT threshold. Add a SingleHighPtMuonNoMuIDNoIso line with tight pT threshold and tight prescale so we could still measure unbiased high-pT hadrons,
  • Increase pT threshold to something much more sensible for Z single and double muID lines,
  • Fix isolation cut in SingleHighPtMuonIso lines and tighten it up at HLT2 and sprucing,
  • Kill SingleMuon back-up sprucing lines after discussion on redundant lines that "may be used in the future" at last RTA WP3 meeting,
  • Small cleanup: use shared builder in single_high_pt_muon.py.

I have done some detailed studies (see bottom of description) that show that the first change should reduce the rate of our most costly line by around 25% for a loss of only ~1% relative efficiency per muon. I verified that I got this in a bandwidth test. I've also checked that we can perfectly supersede the cut offline. Nonetheless, I was still too scared to put the cut straight into HLT2, and in any case the disk budget is more important. I didn't want to tighten this any further as we're not sure yet to what degree we'll fit the isolation distribution offline.

The other changes were sanity changes.

I've run a local bandwidth test in the same configuration as the nightlies, and overall this reduces the QEE full-stream sprucing bandwidth to disk by around 27%. The changes at HLT2 are pretty negligible.

TODO:

  • Local bandwidth test to check I didn't break anything, and give some numbers to the above.
  • Re-assess bandwidth change (updated above)
  • Update slides below

261124_IsolationCutBenchmarking_Revised.pdf

**Summary of precision EW lines after this change (click to expand)**

HLT2

Line Prescale MuonID reqd? Muon pT cut/GeV Mass cut/GeV Iso cut Filter
Hlt2QEE_SingleHighPtMuonFull 1 Yes 15 - - -
Hlt2QEE_SingleHighPtMuonPrescaleFull 0.05 Yes 10 - - -
Hlt2QEE_SingleHighPtMuonIsoFull 1 Yes 12.5 - PFlow, 0.5, <5 GeV -
Hlt2QEE_SingleHighPtMuonNoMuIDFull 0.1 No 15 - - Hlt1SingleHighPtMuonNoMuIDDecision
Hlt2QEE_ZToMuMuFull 1 Yes 3 > 40 - -
Hlt2QEE_ZToMuMu_SingleNoMuIDFull 1 N(isMu) >= 1 10 > 40 - -
Hlt2QEE_ZToMuMu_DoubleNoMuIDFull 1 No 10 > 40 - -
Hlt2QEE_DiMuonHighMassSameSignFull 1 Yes 3 > 16 - -

Sprucing

Line Prescale MuonID reqd? Muon pT cut/GeV Mass cut/GeV Iso cut Filter
SpruceQEE_SingleHighPtMuon 1 Yes 18 - LongPions, 0.4, <8 GeV Hlt2QEE_SingleHighPtMuonFull
SpruceQEE_SingleHighPtMuonNoMuID 0.5 No 18 - LongPions, 0.4, <8 GeV Hlt2QEE_SingleHighPtMuonNoMuIDFull
SpruceQEE_SingleHighPtMuonNoMuIDNoIso 0.1 No 20 - - Hlt2QEE_SingleHighPtMuonNoMuIDFull
SpruceQEE_ZToMuMu 1 Yes 3 > 40 - Hlt2QEE_ZToMuMuFull
SpruceQEE_ZToMuMu_SingleNoMuID 1 N(isMu) >= 1 10 > 40 - Hlt2QEE_ZToMuMu_SingleNoMuIDFull
SpruceQEE_ZToMuMu_DoubleNoMuID 1 No 10 > 40 - Hlt2QEE_ZToMuMu_DoubleNoMuIDFull
SpruceQEE_DiMuonSameSignHighMass 1 Yes 3 > 16 - Hlt2QEE_DiMuonHighMassSameSignFull
Edited by Ross John Hunter

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