sPHENIX HCal discussion

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

Dear All,

Here the minutes of yesterday’s calibration meeting.

Regards,

Stefan

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Hanpu—data analysis update (see slides)

———————————————————————

- sector 5:  MPV too low.  Need to investigate (ACTION ITEM 912 crew)

- Now that voltage setting has been fixed and the peak has lowered by a factor 2.25 (or so), the background likely extends into the peak region.

- therefore fitting background with different approaches:  constant, Woods-Saxon, step function

- fit not sensitive to extend of background under peak (P5 in slice 6:  large uncertainty)

- still MPV uncertainty < 1 %

- some channels don’t seem to have background/pedestal:  need to investigate; 

  - this might always be the same readout channel (ACTION ITEM 912 crew: swap cables in HBD digitizers)

  - could be related to pedestal subtraction of raw data (ACTION ITEM Hanpu:  look at pedestal subtraction)

- second band in MPV vs PR correlation plot not a concern:  related to B24 and B25 tiles with average PR > 1

- need to investigate outliers in sectors 15 and 5 (ACTION ITEM 912 crew)

Shuhang—data analysis update (see slides)

——————————————————————————————

- accumulated distribution of background candidate events by selecting hits where ADC count is 150 less than that of tower vertically above or below

- background candidates include signal, but signal contribution can be calculated, so that some measure of the real background can be extracted   

— 

---------------------------------------------------------------------------------
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 Jun 21, 2021, at 9:28 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 tomorrow:

https://indico.bnl.gov/event/12253/

(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
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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
----------------------------------------------------------------------------------