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Journal articles on the topic 'Higgs Upgrade CMS Phase-II'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Zghiche, Amina. "Optimizing the performance of the CMS Electromagnetic Calorimeter to measure Higgs properties during Phase I and Phase II of the LHC." International Journal of Modern Physics A 35, no. 34n35 (December 18, 2020): 2044011. http://dx.doi.org/10.1142/s0217751x2044011x.

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The CMS Electromagnetic Calorimeter (ECAL), is a high granularity lead tungstate (PbWO4) crystal calorimeter operating at the CERN LHC. The ECAL performance has been crucial in the discovery and subsequent characterization of the Higgs boson. The original ECAL design considerations, and the improvements to the energy reconstruction and energy calibration algorithms to cope with the LHC Run II are described. For the High-Luminosity LHC (HL-LHC) upgrades to ECAL are necessary. The crystals in the barrel region will be retained, defining the HL-LHC CMS barrel electromagnetic calorimeter ECAL. The readout electronics will be upgraded and operating at lower temperatures, to maintain the required performance of ECAL from 2027 onwards. The new readout electronics, the timing resolution and the electron and photon reconstruction efficiencies and energy resolution expected for HL-LHC are presented. The performance relevant to a number of key Higgs decay channels is reported.

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2

Bilki, B. "CMS Forward Calorimeters Phase II Upgrade." Journal of Physics: Conference Series 587 (February 13, 2015): 012014. http://dx.doi.org/10.1088/1742-6596/587/1/012014.

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3

Pedraza-Morales, M. I., A. Fagot, M. Gul, C. Roskas, M. Tytgat, N. Zaganidis, S. Fonseca De Souza, et al. "RPC upgrade project for CMS Phase II." Journal of Instrumentation 15, no. 05 (May 29, 2020): C05072. http://dx.doi.org/10.1088/1748-0221/15/05/c05072.

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4

Gola, Mohit. "CMS phase-II upgrade with GEM detector." Journal of Physics: Conference Series 1498 (April 2020): 012054. http://dx.doi.org/10.1088/1742-6596/1498/1/012054.

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5

Fagot, A., M. Gul, C. Roskas, M. Tytgat, N. Zaganidis, S. Fonseca De Souza, A. Santoro, et al. "Fast timing measurement for CMS RPC Phase-II upgrade." Journal of Instrumentation 13, no. 09 (September 27, 2018): C09001. http://dx.doi.org/10.1088/1748-0221/13/09/c09001.

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6

Dinardo, M. E. "The pixel detector for the CMS phase-II upgrade." Journal of Instrumentation 10, no. 04 (April 20, 2015): C04019. http://dx.doi.org/10.1088/1748-0221/10/04/c04019.

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7

Boghrati, B., V. Amoozegar, M. Ebrahimi, R. Ghasemi, M. Mohammadi Najafabadi, E. Zareian, A. Samalan, et al. "CMS phase-II upgrade of the RPC Link System." Journal of Instrumentation 16, no. 05 (May 1, 2021): C05003. http://dx.doi.org/10.1088/1748-0221/16/05/c05003.

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8

Akchurin, Nural. "Combined Forward Calorimetry Option for Phase II CMS Endcap Upgrade." Journal of Physics: Conference Series 587 (February 13, 2015): 012015. http://dx.doi.org/10.1088/1742-6596/587/1/012015.

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9

Bergauer, Thomas. "Silicon sensor prototypes for the Phase II upgrade of the CMS tracker." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 831 (September 2016): 161–66. http://dx.doi.org/10.1016/j.nima.2016.03.019.

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10

Bornheim, A. "Design studies for the Phase II upgrade of the CMS Barrel Electromagnetic Calorimeter." Journal of Instrumentation 12, no. 03 (March 6, 2017): C03018. http://dx.doi.org/10.1088/1748-0221/12/03/c03018.

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11

Zabi, Alexandre. "Design of the CMS calorimeter trigger upgrade from Phase I to Phase II of the LHC." Journal of Physics: Conference Series 1162 (January 2019): 012040. http://dx.doi.org/10.1088/1742-6596/1162/1/012040.

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12

König, A. "Exploring the quality of latest sensor prototypes for the CMS Tracker Phase II Upgrade." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 845 (February 2017): 106–9. http://dx.doi.org/10.1016/j.nima.2016.05.068.

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13

Vignali, M. Centis. "Characterization of thin irradiated epitaxial silicon sensors for the CMS phase II pixel upgrade." Journal of Instrumentation 10, no. 02 (February 24, 2015): C02040. http://dx.doi.org/10.1088/1748-0221/10/02/c02040.

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14

Jain, G., A. Bhardwaj, R. Dalal, R. Eber, T. Eichorn, M. Fernandez, K. Lalwani, et al. "Design optimization of pixel sensors using device simulations for the phase-II CMS tracker upgrade." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 824 (July 2016): 413–16. http://dx.doi.org/10.1016/j.nima.2015.08.053.

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15

Di Calafiori, Diogo, Günther Dissertori, Raul Jimenez Estupiñàn, Werner Lustermann, and Serguei Zelepoukine. "Status report on the architecture and future upgrades of the CMS Electromagnetic Calorimeter Control And Safety Systems." EPJ Web of Conferences 214 (2019): 01029. http://dx.doi.org/10.1051/epjconf/201921401029.

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The Electromagnetic Calorimeter (ECAL) is one of the particle detectors of the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC). For more than ten years, the CMS ECAL Detector Control System (DCS) and the CMS ECAL Safety Systems (ESS) have supported the experiment operation, contributing to its high availability and safety. The evolution of both systems to fulfil new requirements and constraints, in addition to optimizations towards improving usage and processes automation, led to several changes to their original design. This paper presents the current software/hardware architecture of both CMS ECAL control and safety systems and reviews the major changes applied to both systems during the past years. Furthermore, in view of the CMS Phase-II upgrade of this sub-detector, the corresponding plans for the control and safety systems are also discussed.

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16

Printz, Martin. "Radiation hard sensor materials for the CMS Tracker Phase II Upgrade - Charge collection of different bulk polarities." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 765 (November 2014): 29–34. http://dx.doi.org/10.1016/j.nima.2014.04.042.

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17

Chen, Ziheng, Antonio Di Pilato, Felice Pantaleo, and Marco Rovere. "GPU-based Clustering Algorithm for the CMS High Granularity Calorimeter." EPJ Web of Conferences 245 (2020): 05005. http://dx.doi.org/10.1051/epjconf/202024505005.

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The future High Luminosity LHC (HL-LHC) is expected to deliver about 5 times higher instantaneous luminosity than the present LHC, resulting in pile-up up to 200 interactions per bunch crossing (PU200). As part of the phase-II upgrade program, the CMS collaboration is developing a new endcap calorimeter system, the High Granularity Calorimeter (HGCAL), featuring highly-segmented hexagonal silicon sensors and scintillators with more than 6 million channels. For each event, the HGCAL clustering algorithm needs to group more than 105 hits into clusters. As consequence of both high pile-up and the high granularity, the HGCAL clustering algorithm is confronted with an unprecedented computing load. CLUE (CLUsters of Energy) is a fast fullyparallelizable density-based clustering algorithm, optimized for high pile-up scenarios in high granularity calorimeters. In this paper, we present both CPU and GPU implementations of CLUE in the application of HGCAL clustering in the CMS Software framework (CMSSW). Comparing with the previous HGCAL clustering algorithm, CLUE on CPU (GPU) in CMSSW is 30x (180x) faster in processing PU200 events while outputting almost the same clustering results.

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18

Consoli, Maurizio, and Leonardo Cosmai. "The mass scales of the Higgs field." International Journal of Modern Physics A 35, no. 20 (July 15, 2020): 2050103. http://dx.doi.org/10.1142/s0217751x20501031.

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In the first version of the theory, with a classical scalar potential, the sector inducing SSB was distinct from the Higgs field interactions induced through its gauge and Yukawa couplings. We have adopted a similar perspective but, following most recent lattice simulations, described SSB in [Formula: see text] theory as a weak first-order phase transition. In this case, the resulting effective potential has two mass scales: (i) a lower mass [Formula: see text], defined by its quadratic shape at the minima, and (ii) a larger mass [Formula: see text], defined by the zero-point energy. These refer to different momentum scales in the propagator and are related by [Formula: see text], where [Formula: see text] is the ultraviolet cutoff of the scalar sector. We have checked this two-scale structure with lattice simulations of the propagator and of the susceptibility in the 4D Ising limit of the theory. These indicate that, in a cutoff theory where both [Formula: see text] and [Formula: see text] are finite, by increasing the energy, there could be a transition from a relatively low value, e.g. [Formula: see text] GeV, to a much larger [Formula: see text]. The same lattice data give a final estimate [Formula: see text] GeV which induces to reconsider the experimental situation at Large Hadron Collider (LHC). In particular an independent analysis of the ATLAS[Formula: see text]+[Formula: see text]CMS data indicating an excess in the 4-lepton channel as if there were a new scalar resonance around 700 GeV. Finally, the presence of two vastly different mass scales, requiring an interpolating form for the Higgs field propagator also in loop corrections, could reduce the discrepancy with those precise measurements which still favor large values of the Higgs particle mass.

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19

Adam, W., T. Bergauer, E. Brondolin, M. Dragicevic, M. Friedl, R. Frühwirth, M. Hoch, et al. "Characterisation of irradiated thin silicon sensors for the CMS phase II pixel upgrade." European Physical Journal C 77, no. 8 (August 2017). http://dx.doi.org/10.1140/epjc/s10052-017-5115-z.

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20

Banerjee, Shankha, Biplob Bhattacherjee, Andreas Goudelis, Björn Herrmann, Dipan Sengupta, and Rhitaja Sengupta. "Determining the lifetime of long-lived particles at the HL-LHC." European Physical Journal C 81, no. 2 (February 2021). http://dx.doi.org/10.1140/epjc/s10052-021-08945-9.

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AbstractWe examine the capacity of the Large Hadron Collider to determine the mean proper lifetime of long-lived particles assuming different decay final states. We mostly concentrate on the high luminosity runs of the LHC, and therefore, develop our discussion in light of the high amount of pile-up and the various upgrades for the HL-LHC runs. We employ model-dependent and model-independent methods in order to reconstruct the proper lifetime of neutral long-lived particles decaying into displaced leptons, potentially accompanied by missing energy, as well as charged long-lived particles decaying ihnto leptons and missing energy. We also present a discussion for lifetime estimation of neutral long-lived particles decaying into displaced jets, along with the challenges in the high PU environment of HL-LHC. After a general discussion, we illustrate and discuss these methods using several new physics models. We conclude that the lifetime can indeed be reconstructed in many concrete cases. Finally, we discuss to which extent including timing information, which is an important addition in the Phase-II upgrade of CMS, can improve such an analysis.

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