sPHENIX HCal discussion

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

Dear All,

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

Regards,

Stefan

—

Megan (for Jingyu Zhang)—T dependence

————————————————————————————

- confirmed T dependence used in Hanpu’s analysis

Ejiro—MEPHI data (see slides)

————————————

- have light maps for inner and outer for all tile shapes except B25

  - Edward:  will get B25 and 2nd set of inner shapes by end of September

- implementing in Géant

- John L:  download slides to see 2D plots better

- need to calibrate geometry (MEPHI coordinates have undefined origin)

- will make available in sPHENIX simulation

Dan Lis—simulation update

——————————————————

- working on E distribution

  - using Corsika simulation from Kascade experiment

Shuhang—low-E background (see slides)

———————————————————————————

- correction from last week

  - subtracted plots (sandwiched minus not sandwiched) had different cuts

  - now same cuts

  - difference moved to higher ADC values

  - looks like 15 - 20 % of unsubtracted MIP peak with higher fraction of low-E background

  - could be explained by absence of veto in radial direction

    - qualitatively consistent since tiles longer in radial direction

- comparison of MIP in tile stack vs regular tower (no geometrical cuts)

  - tower has larger background fraction

  - can this be reproduced in simulation?  —> ACTION ITEM Dan Lis

    - muon angular distribution will be important ingredient

- cut-off at ~ 50?  Shuhang’s own offline cut

- Edward:  start by implementing geometric cuts but no E cut (ACTION ITEM)

Hanpu—MIP fitting (see slides)

—————————————————————

- peak finder on average correct, but large individual uncertainty b/c of bin width

- gamma function alone doesn’t describe peak well

- gamma+linear function (linear for low-E background) works most of the time, but sometimes doesn’t work well (large chi2, large uncertainty)

   - probably b/c linear function not well constrained

- maybe best option is to use gamma+linear if indication is it works well, and peak finder otherwise

- tables of MPV and PR data, and outliers

- Edward:  look at correlations to detector geometry

  - e.g. lego plot where z axis is #of hits above some threshold

-- 

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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 16, 2021, at 10:26 PM, Stefan Bathe <stefan.bathe AT baruch.cuny.edu> wrote:

Dear All,

As usual we’ll check in with each other on the HCal muon calibration tomorrow, Tuesday, August 17, after the HCal meeting:

https://indico.bnl.gov/event/12761/

(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

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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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