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backport of #49753
backport of #47564 (partially)

PR description:

This PR includes two bugfixes to the emulation of the AXOL1TL model in the L1-uGT, corresponding to #49753 (to fix the "Pt" values) [*] plus a partial backport of #47564 (to fix the muon eta/phi values used as AXOL1TL's input features).

[*] From the description of #49753.

This PR fixes the "Pt" inputs used in the inference of AXOL1TL models in the L1-uGT emulation.

  • Without this PR, these "Pt" values are truncated to integers (which is unintended, as far as I understand).
  • With this PR, the data-emulator mismatches for L1T algorithms involving AXOL1TL (recently mentioned in #49056 (comment) are reduced by ~10x (see the validation section below).

This is a bugfix. It affects only the results of the L1-uGT emulation for AXOL1TL seeds.

PR validation:

None beyond the validation done for #49754.

If this PR is a backport, please specify the original PR and why you need to backport that PR. If this PR will be backported, please specify to which release cycle the backport is meant for:

#49753
#47564 (partially)

Backport of two bugfixes to the L1-uGT emulator, in case this CMSSW cycle is used for future Run-3 MC campaigns.

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cmsbuild commented Jan 12, 2026

A new Pull Request was created by @missirol for CMSSW_14_2_X.

It involves the following packages:

  • L1Trigger/L1TGlobal (l1)

@BenjaminRS, @cmsbuild, @quinnanm can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @mmusich this is something you requested to watch as well.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.

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cmsbuild commented Jan 12, 2026

cms-bot internal usage

@missirol
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type bugfix

@quinnanm
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please test

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+1

Size: This PR adds an extra 20KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-e7a5ef/50548/summary.html
COMMIT: 0e9a8c8
CMSSW: CMSSW_14_2_X_2026-01-12-2300/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/49783/50548/install.sh to create a dev area with all the needed externals and cmssw changes.

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3 participants