sPHENIX HCal discussion

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

Dear All,

Here the minutes of last week’s meeting (also on indico):

Regards,

Stefan

—

Megan—history of PR values (see slides)

--------------------------------------------------------

- different thresholds used for part of testing period for B21-B24

  - corrected for by scaling PR

- different methods for preproduction and production tiles to calibrate PR

  - production method better

  - PR values not comparable between production and preproduction

    - shouldn’t be a big problem since production and preproduction tiles largely separated in detector assembly

  - new method can be applied to preproduction tiles after the fact to improve PR normalization—ACTION ITEM (GSU) (done for B26-B32 (see Saif’s talk); still missing for B21-B24)

Saif—effect of recalibrating PR (see slides)

————————————————————————————

- only B26-B32

  - threshold effect still has to be corrected for with new method---ACTION ITEM (GSU)

  - no difference pre vs production for B25 (since B25 preproduction tiles were reproduced)

- qualitative improvement seen

  - Stefan:  check if improvement is as expected quantitatively

    - width of distribution before PR normalization should be quadrature sum of normalized width and width of PR distribution

    - ACTION ITEM (Saif)

Shuhang Li—further studies of low energy background (see slides)

———————————————————————————————

- from comparing results with swapped cables for those channels with no background, comparing upper and lower towers, and corroborated by Dan Lis’s simulation, we conclude:

  low energy background is sum of real particles (zero for upper) and electronics

- will test cable swap for upper and lower—ACTION ITEM (Dan Richford)

- what’s low energy structure like at low gain—ACTION ITEM (Dan Richford)

Hanpu Jiang—data analysis update (see slides)

————————————————————————————————

- multiplying by PR is definitely not correct

- difference in low energy background between upper and lower towers in data is also seen in simulation

- comparing tower with no noise to symmetric tower with noise shows that noise influences location of MPV

- Bill points out the sharp edge at around 250 (power of 2) in subtraction of those two towers

Ejiro—simulation update (see slides)

————————————————————————

- found bug; now simulation peak narrower than data; qualitatively similar to Dan Lis; but no direct simulation comparison yet

- comparison of upper and lower towers:  seems reasonable

- no energy distribution of muons yet

Dan Lis—simulation (verbal update)

————————————————————————

- working on

  - angular dependence of energy distribution

  - cosmics trigger

-- 

---------------------------------------------------------------------------------
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
----------------------------------------------------------------------------------

On Jul 19, 2021, at 10:51 PM, Stefan Bathe <stefan.bathe AT baruch.cuny.edu> wrote:

Dear All,

We’ll get together briefly tomorrow after the HCal meeting to discuss updates on the HCal muon calibration meeting:

https://indico.bnl.gov/event/12515/

(Zoom info below)

In addition to the usual updates I hope to get a report from GSU on the PR values, and from Zhiyan on the best option for LED data taking. 

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
Passcode: 850312
One tap mobile
+16465588656,,81749330526# US (New York)
+13017158592,,81749330526# US (Washington DC)

Dial by your location
+1 646 558 8656 US (New York)
+1 301 715 8592 US (Washington DC)
+1 312 626 6799 US (Chicago)
+1 253 215 8782 US (Tacoma)
+1 346 248 7799 US (Houston)
+1 669 900 9128 US (San Jose)
Meeting ID: 817 4933 0526
Find your local number: https://baruch.zoom.us/u/kGbanQPxQ

-- 

---------------------------------------------------------------------------------
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
----------------------------------------------------------------------------------