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Pixel cluster splitting and jet core iteration for HI Tracking #10775
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A new Pull Request was created by @dgulhan for CMSSW_7_6_X. Pixel cluster splitting and jet core iteration for HI Tracking It involves the following packages: Configuration/StandardSequences @cmsbuild, @cvuosalo, @franzoni, @davidlange6, @slava77 can you please review it and eventually sign? Thanks. |
@dgulhan please cleanup commented out code (remove it or give a good explanation why it's still needed there, e.g., new developments coming imminently will need) |
I see that some functional changes are still being done to this PR. If there's work in progress, it makes more sense to do it locally and git push only in the end after everything looks good |
Commented out code was cleaned up. Apologies for the change in the parameters, it was intentional. The current parameters were tested, and the earlier version was a mistake. We are done with our changes now. |
The tests are being triggered in jenkins. |
-1 DAS Error 4.53 step1 DAS Error you can see the results of the tests here: |
@cmsbuild please test |
The tests are being triggered in jenkins. |
The timing study as a function of number of tracks is shown here: As an additional safety, a filter is added on number of jets (highest pT 4 jets) to avoid large timing for events with many jets. Such events were found to occur in data in the past, due to beam scraping events happening simultaneously with collisions events. Such events are not found in MC. |
@dgulhan could you please give a pointer to the files that can be tested using this PR directly. |
I modified matrix workflow 301.0 to make HIMIXed events with pthat 480 to 520 GeV and made 100 events
This gives some events that would pass the jet core. While not very obvious from the PR description " jet core iteration as it is in done in pp tracking", the seeding is very different from the pp case: pixel triplets or pixdoublet+TIB are used for seeding, compared to just doublets in pp. This should reduce the combinatorial growth by quite a bit and make the algorithm fairly manageable even in high hit density environment.
@cvuosalo |
@cmsbuild please test |
The tests are being triggered in jenkins. |
@franzoni @davidlange6 [for operations-pending] |
Pixel cluster splitting and jet core iteration for HI Tracking
Pixel cluster splitting and jet core iteration as it is in done in pp tracking is implemented in HI tracking. The difference is the jet collection, jets used in heavy ions have iterative Pu background subtraction.
Latest related presentations in HI Tracking meetings:
https://indico.cern.ch/event/438299/