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Pixel trigger in CMS Peter Wittich CMS/Cornell University - PowerPoint PPT Presentation

Oct 22, 2022 •513 likes •603 views

Pixel trigger in CMS Peter Wittich CMS/Cornell University 12/2/2019 Trigger in CMS for Phase 2: track trigger Big change for CMS in Phase 2: add information from solid state tracking detector to the hardware trigger Phase 2 CMS tracker

  1. Pixel trigger in CMS Peter Wittich CMS/Cornell University 12/2/2019

  2. Trigger in CMS for Phase 2: track trigger • Big change for CMS in Phase 2: add information from solid state tracking detector to the hardware trigger • Phase 2 CMS tracker is a mixed pixel/strip detector 2S • Outer tracker: Pixel-Strip (PS) and Strip-Strip (2S) modules • Inner tracker: conventional pixel detector PS Pixel triggers -- Peter Wittich 2

  3. Track trigger uses OT • Physics goals: • Better turn-on curves for muons, other high pt tracks • Associate jets with vertices • Better MET turn-on (PUPPI clean-up of stray energy to pile-up) • Requirements: • Low-ish PT threshold (2 or 3 GeV/c) • Good z0 determination (1 mm) • High efficiency • No specification on d0 resolution • Initial studies all assumed d0=0 to improve pt resolution Pixel triggers -- Peter Wittich 3

  4. PT modules • Front-end data reduction via special modules that make PT cut • Factor of 10 reduction • Enables L1TT with outer tracker • Data rate still 20-40 Tbps Pixel triggers -- Peter Wittich 4

  5. Physics goals of run 4: • Higgs physics, new physics searches, forward physics • No explicit goal to do B physics • Many new physics models predict displaced tracks • Seems like a good place for a pixel trigger Pixel triggers -- Peter Wittich 5

  6. Could CMS pursue a pixel trigger? • Idea has been floated several times, mainly studied by one group of proponents • Use cases: • electron tracking. Offline electron tracking uses the innermost pixel layers in looking for the track of the electron before it has radiated. Emulate with an ecal-seeded tracking pass (ROI-based) • B tagging. OT distance from beam line means not enough d0 resolution for ctau ~ b lifetime • Note that very long lived tracks (few mm – 5 cm ctau) can be reco’d by OT • Technical issues? • Large number of readout channels means likely only possible as a ROI-seeded trigger • Latency window would be very tight but possibly doable doi:10.1088/1748-0221/10/10/C10001 https://doi.org/10.22323/1.282.0243 Pixel triggers -- Peter Wittich 6

  7. CMS decided against pursuing this • We had recently (18 months ago) come up with an idea of how to pursue this from a technical perspective • Special joint FIFO-RAM object (destructive read) • Seeded by L1T (3-4 us after collision) • Re-examined idea of electron tracking improvements • Concluded that it wasn’t obvious you couldn’t get the same performance gains with a special OT-only tracking pass • Idea was abandoned again • Nota bene: sunk due to lack of a compelling physics case Pixel triggers -- Peter Wittich 7

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