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