sPHENIX HCal discussion

[Stefan Bathe <stefan.bathe AT baruch.cuny.edu>]

Dear All,

Here are the minutes from yesterday’s meeting (also on indico).

Regards,

Stefan

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John Lajoie—simulations

—————————————————

- working with Ejiro on implementing MEPHI tile maps

- should result in more realistic simulation (I expect peak to broaden)

Hanpu—PR and T correction (see slides)

—————————————

- updates on MPV distributions:

   - PR values normalized by tile shape

      - discussion whether to normalize shape-by-shape PR-corrected MPV distributions to have same average for every shape

      - this would certainly narrow the overall MPV distribution

      - I think in the meeting we said that would be a good idea  

   - temperature corrected (nominal is 26 C)

      - this is working very well as can be seen from the comparison of slides 17 (w/o) and 18 (w/ T correction) for sectors 3 and 15 where we have two runs each taken at different temperatures

- OPEN QUESTIONS

   - why no improvement for B21?

      - suggestion:  quote sigma separately for preproduction and production

   - why preproduction tiles still have low MPV after PR correction?

   - were the outliers after PR correction also outliers before PR correction?

Shuhang—data analysis update (see slides)

——————————————————————————————

- low gain cosmic runs

  - not enough statistics

  - Stefan will discuss with Dan Richford

- low-E background

  - found new cuts to remove background

  - 3-tower stack

    - background disappears when tower in question is sandwiched (slide 4)

    - background does not change peak position (slide 5)

- OPEN QUESTION

   - why do two channels (30, 46) not have background?

     - tests:

       - swap upper and lower

       - maybe some other swaps with 3-tower stack

Saif—Effect of recalculation of preproduction PR values (see slides)

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- working on db for recalculated (and historical) PR values

- pointing out that some towers aren't PR-matched as well anymore as they were before after recalculating preproduction PR values

- to match better one would have to start swapping tiles around

- Stefan:  probably won't matter much at all for anything we'll ever measure.  It's a small number of towers affected to begin with, and it's just individual tiles.

  - Doesn't cross the threshold to open up the fully tested and ready for installation (or already installed) sectors in my opinion.

  - But decision should be elevated to HCal meeting (i.e. John Lajoie)

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Stefan Bathe

Professor of Physics
Baruch College, CUNY

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
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On Aug 3, 2021, at 9:14 AM, Stefan Bathe <stefan.bathe AT baruch.cuny.edu> wrote:

Dear All,

Just a reminder that we’ll get together briefly again today after the HCal meeting to discuss updates on the HCal muon calibration:

https://indico.bnl.gov/event/12644/

(Zoom info below)

Regards,

Stefan

ZOOM INFO:

Stefan Bathe is inviting you to a scheduled Zoom meeting.

Topic: HCal Calibration
Time: This is a recurring meeting Meet anytime

Join Zoom Meeting
https://baruch.zoom.us/j/81749330526

Meeting ID: 817 4933 0526
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Stefan Bathe

Professor of Physics
Baruch College, CUNY

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
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