PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Detector
Design and performance of the upgrade of the CMS L1 trigger
O. Davignon*  on behalf of the CMS Collaboration
Full text: pdf
Published on: August 02, 2019
During its second run of operation, the LHC delivered proton-proton collisions at a center-of-mass energy of 13 TeV with a peak instantaneous luminosity larger than $2 \times \mathrm{10^{34}\; cm^{-2}\cdot s^{-1}}$, more than double the peak luminosity reached during Run-1 and far larger than the design value. The upgraded CMS Level-1 trigger is designed to improve the performance at high luminosity and large number of simultaneous inelastic collisions per crossing (pileup). During the technical stop at the beginning of 2016, all the electronic boards of the CMS Level-1 trigger have been replaced and the upgraded electronics tested, and commissioned with data. Smarter, more sophisticated, and innovative algorithms are now the core of the first decision layer of CMS: the upgraded trigger system implements pattern recognition and MVA (Boosted Decision Tree) regression techniques in the trigger boards for $\mathrm{p_T}$ assignment, pileup subtraction, and isolation requirements for electrons and taus. In addition, the new global trigger is capable of evaluating complex selection algorithms such as those involving the invariant mass of trigger objects. The upgrade reduces the trigger rate and improves the trigger efficiency for a wide variety of physics signals. In this paper, the upgraded CMS Level-1 trigger design and its performance are described.
DOI: https://doi.org/10.22323/1.340.0198
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.