4D Tracking and 5D Calorimetry

Thursday 26 Oct 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

5D calorimeter - single pion #2 (int).pdf

5D calorimeter - single pion #2.pdf

Doyeong 

color code: summary / action items

The questions raised last week are addressed. 
1) duplicated cells in an event:

• happened due to the topo-algorithm (slide 31)
• the duplicated cells are removed for our study
• the removal has negligible influence in our study/results

2) cell time correlation 

• cells are sorted by reco cell E and the correlation between them are checked - up to ~4th cells are important (slide 34)
• we also would like to see the correlation between neighboring cells (distance in 3D)
• to clearly understand the correlation, 1/sqrt(N) with 1~3 cells can be checked (due to limited # cells after hard cuts on cell E)

The very first draft for the next week's presentation at the Upgrade Physics meeting is ready and uploaded to the agenda.

1. Using neutral pions with at least one energetic cell (>1GeV), 
   we can achieve a very decent timing resolution (~60 ps) at central region
   1GeV cut on reco cell E still kept 42.9% of pions among all pion that passed baseline selection
2. Using neutral pions with at least one energetic cell (>2GeV), 
   we can achieve a timing resolution of ~450 ps at central region
   2GeV cut on reco cell E still kept 8.65% of pions among all pion that passed baseline selection

There are a few fine-tuning we would like to try

1. Is 0.1 GeV cut really the optimal?
2. In general, there are work that can be done for charged pion
   • better fits and calibration with tile
   • instead of averaging all cells, average up to Nth cells (maybe 4 based on the correlation plot)
   • Maybe lower the leading cell threshold from 2 GeV to 1.5 GeV?

I will circulate the enhanced version of the slides by Monday.

 

 

10:40 Single pion studies

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

Speakers: Doyeong Kim, Zahra Farazpay (Loisiana Tech)

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