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Raise pT threshold for low pT GSF electron seeds in PbPb era #39028
Raise pT threshold for low pT GSF electron seeds in PbPb era #39028
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+code-checks Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-39028/31515
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A new Pull Request was created by @mandrenguyen (Matthew Nguyen) for master. It involves the following packages:
@jpata, @cmsbuild, @clacaputo can you please review it and eventually sign? Thanks. cms-bot commands are listed here |
@cmsbuild please test |
+1 Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2e6e72/26778/summary.html Comparison SummarySummary:
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+reconstruction
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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, @qliphy, @rappoccio (and backports should be raised in the release meeting by the corresponding L2) |
+1 |
It was realized that in the Run 3 configuration lowPtGsfElectronSeeds is one of the most time-consuming parts of the tracking in PbPb events.
Electrons in PbPb are only used at pT > 15 GeV, for EW bosons. Reconstruction and identification for low pT elections would be extremely challenging, given the occupancy.
In fact, in the pp_on_AA era we had already made the customization:
e.toModify(trackerDrivenElectronSeeds, MinPt = 5.0)
See:
trackerDrivenElectronSeeds_cfi
This PR extends this customization, with the same 5 GeV threshold, to lowPtGsfElectronSeeds
Around 5% is saved in the reconstruction time of minimum bias events (tested on 200 events). The AOD size is reduced by less than 0.5%.
The change was tested on wf 159.