LHC-EW WG: Jets and EW bosons

Monday 24 Aug 2020, 16:30 → 17:50 Europe/Zurich

We will use ZOOM for the meeting:

https://cern.zoom.us/j/7861953672

Meeting ID: 786 195 3672

And only in case of problems we go back to vidyo

(https://vidyoportal.cern.ch/join/Fn6muEWvrQ)

 

LHCEWWG Jets+Ew, 24 August 2020

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• ping Andreas on jet substructure

 

s4. Tutorial: RIVET and P8. Hannes to add PB TMDs. Would be good to add SHERPA (Marek?) and HERWIG (?), but need help to set these up

• Z+jet, W+jet, inclusive jets for benchmark, 7, 8 and 13 TeV
• centrally produced LHE files for all generators
• all three channels with more than one prediction
  • check that no tension between experiments (1 MC enough)
  • compare multiple generators to understand differences
• people:
  • DESY: Heng and Mikel, V+jet
  • Andrius (CMS) + Alec, Pierre-Hugues, Colette, Vincet
  • Helsinki: Laura
  • CMS/ATLAS combination in the future on V+jet and inclusive jets?

s5. LHCEW general / YR

• Benchmarks (DESY, Vilnius, Helsinki)
• Intrinsic kT tunes for Pythia8. Just tuning issue or e.g. energy dependent width (Hanne / DESY)
• Jet substructure: Heng, Mario Campanelli w/ student; => contact Sal Rappocio, Andreas Hinzmann (CMS), cc Mario and Ben Nachmann
• Systematics: Louie Carper, at advanced stage already, essentially ready. Important to have unified scheme for storing systematics. Presented to CMS GEN/SMP, ALICE etc. (=> for Mikko, read chapter) 

s6. VBF and VBS meeting. Papers looking at parton shows contributions to VBF and VBS. W/Z transverse momentum would have relevance for VBF/VBS. Our studies also relevant for QCD background to VBF/VBS, but more interesting to think of it as signal and test.

s7. Jet reference

• nobody measuring 13 TeV at ALICE. Focusing on tracks jets since no full phi-coverage. Nima: somebody is already working on cross section at 13 TeV with full tracking+calorimetry
• ATLAS contact: Alec Drobac can find people (Steven Schramm from JetMET)

 

QCD@LHC talk

• ATLAS Lund jet plane in, Mario worked on it? => add
• CMS Colour singlet => could drop, not expert on this
• ALICE x3 results, check if all (Nima’s favorite is substructure)
• scope out jet substructure talks from all exits to fit in 20'?

s10. JER SF: ATLAS numbers?

• Hannes: outline looks fine
• no further comments from others

16:30 → 17:00 News and discussion

• Tutorial
• Yellow Report / LHCEW general meeting in Oct
• Common meeting with multiboson group on VBF and VBS

Speakers: Vieri Candelise (Universita e INFN Trieste (IT)), Mikko Voutilainen (Helsinki Institute of Physics (FI)), Hannes Jung (Deutsches Elektronen-Synchrotron (DE))

lhcewwg_jets_2020_08_24.pdf

17:00 → 17:20 Draft of QCD@LHC plenary on "Jet measurements at LHC" for feedback

Speaker: Mikko Voutilainen (Helsinki Institute of Physics (FI))

qcdatlhc_2020_08_31_lhcjets_voutila_draft_v0.pdf

qcdatlhc_2020_08_31_lhcjets_voutila_v1.pdf