FCC-hh calorimeters informal meeting

Wednesday 3 Dec 2014, 14:00 → 17:00 Europe/Zurich

4/S-030 (CERN)

Ana Maria Henriques Correia (CERN), Marcello Mannelli (CERN)

Brainstorm on the main physics benchmarks to define hadron calorimeter specifications (resolution, granularity, containment, etc) to present in the January detector mini WS

Ana's summary

This was originally an informal meeting, but it has become somehow more formal.

Marcello and Ana will coordinate the calo section for this January/February workshop, 1 day (conflict with a Hong Kong workshop).

We should continue those studies:

• Carlos will define the parameterisations of the containment, comparing to existing data where available
• Clement reminded us of single hadron content in a jet
  • what are the needs for test beams in the future? 350 GeV is SPS, we could extract beams from the LHC
  • we need to xcheck the fragmentation function
• Caterina will continue studies on benchmarks for plain jets, iterate with Maxim + check constant term
• Sergei & Jimmy are working on granularity for substructure
• What are we missing?
  • Maurizio and Maxim presented influence of granularity on substructure
    • LHC people are busy!
  • David Miller + student wants to help working in jet substructure as well

It's clear we need to do something like this for the ECal as well, but we didn't discuss how to develop that.

We could have two complementary detector approaches, with different strengths. Could think about that as well.

Michelangelo's suggestions:

• Test beams: improve parameterisations of showers before the TB, liaise with Geant4 people
  • Outline better which issues could be addressed now to improve the simulation, relevant for this discussion. Involve the G4 people here as well.
• Since you mentioned Maurizio: keep in mind the difference between a W/H jet and a top jet: radiation pattern - they should be separated when measuring performance of taggers, even though it's not directly related to calorimeter resolution.
• Another thing missing: discussion of MET. We need MET experts. Important interplay between the physics component of the MET (forward region) and the detector part of MET, resolution dominated by central.
• We should find other benchmarks, lower-energy things as well
  • Philip Moortgat (BSM) is supposed to prepare a document with benchmarks. Can we recruit from that?

14:00 → 14:10 Single hadron content in multi-TeV jets

Speaker: Clement helsens

14:15 → 14:25 Longituidnal containment parametrisation for TeV single hadrons and jets

Speaker: Carlos Solans Sanchez (CERN)

Slides Carlos_FCC_20141203.pdf

14:30 → 14:40 Effect of had. calorimeter resolution and longitudinal leakage on q*->jj mass resolution

Speaker: Ms Caterina Doglioni (Universite de Geneve (CH))

Slides 20141203_FHCInformal_DijetResonanceBenchmarks.pdf

14:45 → 14:55 Effect of had. calorimeter transversal granularity on boosted top mass resolution

Speakers: James Proudfoot (Argonne National Laboratory (US)), Sergei Chekanov (Argonne National Laboratory (US))

Slides FCC_hcal_dec1.pdf

15:00 → 15:30 Discuss Other physics bench mark channels (jet substructure, exotics,...) to study other hadron calorimeter parameters (speed, time resolution, ....)

Speaker: all

15:30 → 15:31 A.O.B:Hadron calorimeter considerations (Presentation given in last FCC-hh WS)

Slides http://indico.cern.ch/event/304759/contribution/19/material/slides/