sPHENIX HCal discussion

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

Dear All,

Here the minutes of today’s meeting (also on indico).

Regards,

Stefan

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Communication channel

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Slack trial subscription ran out.  Move to MatterMost or Discourse?  Stefan will discuss with Colorado group.

Dan Richford—Digitizer channel swap test (see slides)

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- description of digitizer channel swap test

Shuhang—Digitizer channel swap test (see slides)

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- analysis of digitizer channel swap test

- background follows switch => absence (or presence) of background is related to digitizer

- hypothesis:

  - background is real (evidence:  can be reduced in 3-tower test; is present in simulation)

  - two channels somehow (how?) suppress background

- absence of background shifts peak (of same channel!) by about 1 % (depending on fitting)

Hanpu—data analysis (see slides)

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- exclusion of towers with large PR spread (after PR recalculation for preproduction)

  - does not remove outliers

  - MPV/PR not correlated with PR (not shown in slides—Hanpu, could you add this plot to your posted slides?)

  - renewed discussion of what could cause outliers:

    - check if related to ADC channels (probably not). ACTION ITEM Hanpu

    - check whether related to preamps ACTION ITEM Dan, Stefan

- fitting method

  - finds that fit with gamma function + linear function, using maximum of whole function, gives best description of peak and should be accurate enough 

  - for channels where \xi^2/ndf large, use peak finder

  - consensus that we will use this method for calibration

- 

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Stefan Bathe

Professor of Physics
Baruch College, CUNY
and RIKEN Visiting Scientist

Baruch:                                     BNL:
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phone 646-660-6272                phone 631-344-8490
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On Aug 30, 2021, at 10:28, Stefan Bathe <stefan.bathe AT baruch.cuny.edu> wrote:

https://indico.bnl.gov/event/12909/