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The Large Hadron Collider has entered a new era in Run 2, with centre-of-mass energy of 13 TeV an... more The Large Hadron Collider has entered a new era in Run 2, with centre-of-mass energy of 13 TeV and instantaneous luminosity reaching Linst = 1.4×1034 cm-2 s-1 for pp collisions. In order to cope with those harsher conditions, the ATLAS and CMS collaborations have improved their online selection infrastructure to keep a high efficiency for important physics processes – like W, Z and Higgs bosons in their leptonic and diphoton modes – whilst keeping the size of data stream compatible with the bandwidth and disk resources available. In this note, we describe some of the trigger improvements implemented for Run 2, including algorithms for selection of electrons, photons, muons and hadronic final states. Presented at LHCP2017 5th Large Hadron Collider Physics Conference 2017 Proceedings of the Fifth Annual LHCP ATL-PHYS-PROC-2017-XXX CMS-CR-2017/368 November 8, 2017 Evolution of online algorithms in ATLAS and CMS in Run 2 Thiago R. F. P. Tomei On behalf of the ATLAS and CMS Collaboration...
The CMS experiment has been designed with a two-level trigger system: the Level 1 Trigger, implem... more The CMS experiment has been designed with a two-level trigger system: the Level 1 Trigger, implemented on custom-designed electronics, and the High Level Trigger, a streamlined version of the CMS offline reconstruction software running on a computer farm. During its "Phase 2" the LHC will reach a luminosity of 7×10³⁴ cm⁻²s⁻¹ with a pileup of 200 collisions, integrating over 3000 fb⁻¹ over the full experimental run. To fully exploit the higher luminosity, the CMS experiment will introduce a more advanced Level 1 Trigger and increase the full readout rate from 100 kHz to 750 kHz. CMS is designing an efficient data-processing hardware trigger (Level-1) that will include tracking information and high-granularity calorimeter information. The current conceptual system design is expected to take full advantage of advances in FPGA and link technologies over the coming years, providing a high-performance, low-latency computing platform for large throughput and sophisticated data co...
The Large Hadron Collider has entered a new era in Run 2, with centre-of-mass energy of 13 TeV an... more The Large Hadron Collider has entered a new era in Run 2, with centre-of-mass energy of 13 TeV and instantaneous luminosity reaching Linst = 1.4×1034 cm-2 s-1 for pp collisions. In order to cope with those harsher conditions, the ATLAS and CMS collaborations have improved their online selection infrastructure to keep a high efficiency for important physics processes – like W, Z and Higgs bosons in their leptonic and diphoton modes – whilst keeping the size of data stream compatible with the bandwidth and disk resources available. In this note, we describe some of the trigger improvements implemented for Run 2, including algorithms for selection of electrons, photons, muons and hadronic final states. Presented at LHCP2017 5th Large Hadron Collider Physics Conference 2017 Proceedings of the Fifth Annual LHCP ATL-PHYS-PROC-2017-XXX CMS-CR-2017/368 November 8, 2017 Evolution of online algorithms in ATLAS and CMS in Run 2 Thiago R. F. P. Tomei On behalf of the ATLAS and CMS Collaboration...
The CMS experiment has been designed with a two-level trigger system: the Level 1 Trigger, implem... more The CMS experiment has been designed with a two-level trigger system: the Level 1 Trigger, implemented on custom-designed electronics, and the High Level Trigger, a streamlined version of the CMS offline reconstruction software running on a computer farm. During its "Phase 2" the LHC will reach a luminosity of 7×10³⁴ cm⁻²s⁻¹ with a pileup of 200 collisions, integrating over 3000 fb⁻¹ over the full experimental run. To fully exploit the higher luminosity, the CMS experiment will introduce a more advanced Level 1 Trigger and increase the full readout rate from 100 kHz to 750 kHz. CMS is designing an efficient data-processing hardware trigger (Level-1) that will include tracking information and high-granularity calorimeter information. The current conceptual system design is expected to take full advantage of advances in FPGA and link technologies over the coming years, providing a high-performance, low-latency computing platform for large throughput and sophisticated data co...