4D Tracking and 5D Calorimetry

Thursday 28 Sept 2023, 10:00 → 12:00 America/Los_Angeles

Zoom:

https://stanford.zoom.us/j/92728532486pwd=eHBpcDQ0RjdnZlBjQmRHYW1WRjdFUT09

Password: 059507

Publications:

• https://cds.cern.ch/record/2870326 "Investigating the impact of 4D Tracking in ATLAS Beyond Run 4"

 

10:00 → 10:30 4D Tracking

10:00 Tracking clustering, seeding and finding

Tracking performance (purity, efficiency, CPU time)
minimum pT threshold
Large-R tracking

10:10 Object performance: b-tagging, charm-tagging, tau-tagging, PU suppression, Missing ET, particle flow

• b-tagging
• charm-tagging
• tau-tagging
• PU suppression
• Missing ET
• Particle flow

10:20 Layout studies

Mechanical, electrical (power), radiation, and data-transmission constraints for either a second layer replacement or a dedicated third timing layer. Consider potential technologies for sensors, electronics, and data-transmission. Study barrel and disk options separately.

10:30 → 11:10 5D Calorimetry

10:30 Vertex t0 reconstruction

• t0 resolution and efficiency
• Applications:
  o t0 for HGTD
  o PU suppression
  o LLP search (displaced photons/jets)

Speaker: Doyeong Kim

10:40 Single pion studies

• time evolution/structure of pion showers
• response vs time
• neutron component identification

Speakers: Doyeong Kim, Zahra Farazpay (Loisiana Tech)

HFSF2023 FollowUp - 12.pdf

Doyeong

Summary
Last week, we found that cell timing resolution depends on the EM calo layer. This week, I checked the following:

• Checked for any dependency on truth pion pT (slide 6, 7)
• Fitted the distribution using the function A + (B/x) + (C/x^2) + (D/x^3) (slide 6, 7)
• Applied the fit functions for calibration (slide 8-12)

Action Items

• Update the fit function for RMS vs cell time to be physics-motivated: A + Bsqrt(x) + Cx, where A represents noise, B represents stochastic effects, and C represents a constant term.
• Update the fit function for mean vs cell time to be simple, like exponential.
• Include additional selection criteria to compare averaged distributions with one cell and two cells:
  • Currently, the averaged distributions on slides 11 and 12 include different sets of events.
  • To ensure a fair comparison, select events with at least one cell after applying the cell E > 2GeV cut. 
  • Then apply the 2GeV and lower cell E cuts to compare the same set of events with different cuts. 
  • We expect to see enhanced timing resolution from the lower cell E cut.
• Add an energy resolution plot for validation.
• The same study with Pi0.
   

10:50 Space-time structure of hadronic showers

• Response vs time
• overlapping showers
• time-aware GNN PFlow reconstruction

Speaker: Zahra Farazpay (Loisiana Tech)

11:00 Higgs Factory calorimeter timing studies

11:10 → 11:40 Electronics and Sensors: 4D/5D techniques

11:10 LGDAs

Speakers: Christopher Kenney (SLAC), Julie Segal (SLAC)

11:20 28nm CMOS TDC ASIC

Speakers: Bojan Markovic (SLAC), Larry Ruckman (SLAC)

11:30 4D Tracking and 5D Calorimetry electronic concepts