Discussion on Timing

→ Europe/Paris
Zoom link
Cacher

2022-06-30 Tint Discussions

Participants

  • Muchen He
  • Yuzhi Che
  • Fanjie Meng (mfj)
  • Manqi
  • Lagarde Francois
  • Vincent Boudry
  • Gérald Grenier
  • Fabricio Jimenez

News

Vincent

  • Contributed White Paper at Snowmass
    • A few paragraphs on the potential of timing in HG calorimeters
    • Available at https://arxiv.org/pdf/2203.07286.pdf
    • Q? Deadline for Snowmass white/contributed papers ?
      • https://snowmass21.org/submissions/start
      • Formal = March 15, 2022
      • Informal: ➞ CSS meeting in July

Cluster time measurement with CEPC calorimeter

Yuzhi

  • Some unexpected behaviours at 0.3ps
  • Looking at subhits from 10 GeV γ, μ, π
    • no B field, θ= 84°, φ = 0
    • t_hit from
      • Most energetic subhits
      • hit pos = center of cell
      • shifted time T = t_hit - L_IP➞hit /c
    • Crenel structure with 0.6 ps (=200μm/c) pitch
    • some t_hit<0
    • Due to ∆ hit position (center-of-cell vs subhit)
      • Confirmation:
      • Not seen at θ=90°
  • "best" definition of hit time and position ?
    • 3 defs
      • 1 t from most energetic subhit + center-of-cell
      • 2 t from most energetic subhit + (start+end)/2 of this subhit
      • 3 t from fastest subhit + (start+end)/2 of this subhit
    • x,y,z for each def × γ,μ, π
      • "long" tails >10 ps for all , μ's
  • Discussions
    • Must find a proper weighting (~ shaping in digitization)
    • Charge collection / current start is probably limiting also the effects
      • Needs proper modelling (GARFIELD, ...)
    • Effect of cell size >> ∆t/c
      • Limit to 10 (30 ?) ps ?

Timing in Jets

Gérald

  • M1 intership student looking at time distribution in jets
  • 1st version of report today ➞ next time
  • Code of MARLIN extractin available on the indico, valid for all calos
  • Discussion
    • Availbility of data in "standard" ILD production ?
      • Not for all, but a subsample.

AoB

  • Contributions to ECFA WS
    • Cluster Time should be one (paper near complete)
    • On the effect in the cells ?
      • ps timing...
      • Yuzhi, Henri ?
    • On the potential of timing (all together) in HG Calos ?
  • Beam tests
    • SDHCAL
      • end of september
        • Participation to ECFA WS unlikely (Gérald)
        • Maybe some 1 MGRPC in the setup
    • ScECAL
      • October ?
  • Next meeting ➞ end of summer
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