MTD digitization: Add calculation of per SiPM time resolution to BtlElectronicsSim

[fabiocos]

PR description:

This PR makes more explicit in the code the different components of the BTL time resolution model used so far, in order to easily relates detectors studies and the existing CMSSW implementation. This is based on an older study documented in
https://indico.cern.ch/event/1106612/contributions/4659237/attachments/2366975/4041918/BTLresolution_20211217.pdf
In this PR the model is not changed, but there is some minor code cleaning, and an optional LogDebug printout providing reference values used:

%MSG-d BTLElectronicsSim:  MixingModule:mix@ctor 22-Mar-2023 17:32:34 CET  pre-events BTLElectronicsSim.cc:60
 BTL time resolution model (ns, 1 SiPM), for an average light output of    8400.000000 N_pe:
 sigma stochastic   =       0.046840
 sigma DCR          =       0.015793
 sigma electronics  =       0.004762
 sigma sptr         =       0.013416
 sigma clock        =       0.015000
 ---------------------
 sigma total        =       0.053583
%MSG

PR validation:

This code has been used to produce 10 events with test workflow 20834.0 (TTbar noPU scenario D88), whose BTL digi dump https://github.com/cms-sw/cmssw/blob/master/SimGeneral/Debugging/test/SimDigiDumper.cc#L421 is identical to the default one.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-41131/34780

• This PR adds an extra 20KB to repository

[cmsbuild]

A new Pull Request was created by @fabiocos (Fabio Cossutti) for master.

It involves the following packages:

• SimFastTiming/FastTimingCommon (upgrade, simulation)

@cmsbuild, @AdrianoDee, @srimanob, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[fabiocos]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-da6848/31518/summary.html
COMMIT: 1c72394
CMSSW: CMSSW_13_1_X_2023-03-22-1100/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/41131/31518/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 10 lines to the logs
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3552750
• DQMHistoTests: Total failures: 3
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3552725
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 48 files compared)
• Checked 213 log files, 164 edm output root files, 49 DQM output files
• TriggerResults: no differences found

[civanch]

+1

[srimanob]

+Upgrade

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1