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Abstract
During LHC Run II the centre-of-mass energy of pp collisions has increased from 8 TeV up to 13 TeV and the instantaneous luminosity has progressed towards 2 × 1034 cm−2s−1. In order to guarantee a successful and ambitious physics programme under these conditions, the CMS trigger system has been upgraded. The upgraded CMS Level-1 trigger is designed to improve performance at high luminosity and large number of simultaneous inelastic collisions per crossing. The trigger design, implementation and commissioning are summarised, and performance results are described.
Highlights
Trigger algorithms and performanceThe upgraded e/γ finding algorithm [4, 5] brings a number of improvements over the legacy algorithm
13 TeV and the instantaneous luminosity has progressed towards 2 × 1034cm−2s−1
Flexible system: Simple to upgrade from 16 bit towers to 24 bit towers or provide extra logic resources
Summary
The upgraded e/γ finding algorithm [4, 5] brings a number of improvements over the legacy algorithm. In particular the new algorithm is based on dynamic clustering, allowing the dimensions of the energy clustered to form the e/γ candidate to adapt to the pattern of energy deposited in the electromagnetic calorimeter. This gives improved energy containment for showering electrons and photon conversions without being affected significantly by pile-up. Clusters produced using this algorithm have better energy resolution than those formed by the legacy algorithm. An isolation requirement may be placed on the τ candidates, which includes whether two clusters were merged as input
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