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CMS Conference Reports

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2025-04-22
11:01
Design and construction of the Outer Tracker for the CMS Phase-2 Upgrade / Zoi, Irene (Fermilab) /CMS Collaboration
The High-Luminosity LHC (HL-LHC) is expected to deliver an integrated luminosity of 3000--4000~fb−1 over 10 years of operation with the peak instantaneous luminosity reaching about \mbox{5--7.5×1034cm−2\,s−1}. During Long Shutdown 3, several components of the CMS detector will undergo major improvements, called Phase-2 upgrades, to be able to operate in the challenging environment of the HL-LHC. [...]
CMS-CR-2025-081.- Geneva : CERN, 2025 - 5 p. Fulltext: PDF;
In : 17th Vienna Conference on Instrumentation (VCI2025), Vienna, Austria, 17 - 21 Feb 2025

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2025-04-22
11:01
Beam test characterization of an irradiated pixel-strip module for the HL-LHC CMS tracker upgrade. / Sohail, Iqra (Quaid-i-Azam U.) /CMS Collaboration
\begin{abstract} A new tracker for the CMS detector at the Large Hadron Collider will be built to address the demands of the High Luminosity upgrade, which aims to achieve peak instantaneous luminosities from 5 up to 7.5×1034cm−2s−1 and an integrated luminosity of 3000--4000 fb−1 at a center of mass energy of 14 TeV. To meet the resulting challenges, the CMS experiment is changing its outer tracker silicon modules to include tracking capabilities at the Level-1 trigger [...]
CMS-CR-2025-080.- Geneva : CERN, 2025 - 5 p. Fulltext: PDF;
In : 17th Vienna Conference on Instrumentation (VCI2025), Vienna, Austria, 17 - 21 Feb 2025

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2025-04-15
12:53
CMS Inner Tracker Upgrade for the HL-LHC Design, Development, and Production Status / Kuo, Chin-chia (Hamburg U.) /CMS Collaboration
The High Luminosity Large Hadron Collider operation will push the CMS experiment to its limits, with an instantaneous peak luminosity of 7.5×1034cm−2s−1 and an integrated luminosity of 300fb−1 per year. This environment will expose the CMS Inner Tracker (IT) pixel detector at the center of CMS to unprecedented levels of radiation, with a 1 MeV neutron equivalent fluence of Φeq=2.6×1016cm−2 and a total ionizing dose of 13MGy after 3000fb−1 of integrated luminosity. [...]
CMS-CR-2025-084.- Geneva : CERN, 2025 - 5 p. Fulltext: PDF;
In : 17th Vienna Conference on Instrumentation (VCI2025), Vienna, Austria, 17 - 21 Feb 2025

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2025-04-15
10:00
CMS FlashSim end-to-end simulation with ML / Rizzi, Andrea (INFN, Pisa ; Pisa U.) /CMS Collaboration
Detailed event simulation at the LHC is taking a large fraction of computing budget.CMS developed an end-to-end ML based simulation that can speed up the time for production of analysis samples of several orders of magnitude with a limited loss of accuracy. As the CMS experiment is adopting a common analysis level format, the NANOAOD, for a larger number of analyses, such an event representation is used as the target of this ultra fast simulation that we call FlashSim. [...]
CMS-CR-2025-027.- Geneva : CERN, 2025 - 13 p. Fulltext: PDF;
In : 27th International Conference on Computing in High Energy & Nuclear Physics, Kraków, Poland, 19 - 25 Oct 2024

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2025-04-07
14:30
Upgrade of the CMS Electromagnetic Calorimeter for the High-Luminosity LHC / Lavizzari, Giulia (INFN, Milan Bicocca ; Milan Bicocca U.)
The High Luminosity upgrade of the LHC (HL-LHC) at CERN will provide unprecedented instantaneous and integrated luminosities of around 5 x 1034 cm−2 s−1 and 3000/fb, respectively. The expected average of 140 to 200 collisions per bunch-crossing represents a severe challenge for the detectors. [...]
CMS-CR-2025-099.- Geneva : CERN, 2025 - 8 p. Fulltext: PDF;
In : 13th International Conference on New Frontiers in Physics 2024 (ICNFP 2024), Kolymbari, Greece, 26 Aug - 4 Sep 2024

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2025-04-07
14:30
First observation of the η→4μ decay with the CMS detector / Rossin, Roberto (INFN, Padua ; Padua U.) /CMS Collaboration
The first observation of the rare η→μ+μ−μ+μ− double-Dalitz decay is presented. The analysis is based on data collected by the CMS experiment at the CERN LHC operating at the centre-of-mass energy of √s=13TeV. [...]
CMS-CR-2025-092.- Geneva : CERN, 2025 - 9 p. Fulltext: PDF;
In : Multiplicity-dependent heavy flavour production at the LHCb experiment

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2025-04-03
13:30
Search for rare muonic B decays at CMS / Szlezak, Klara Emilia (Warsaw U.) /CMS Collaboration
In this paper, we present the search for three highly suppressed Standard Model processes at the CMS experiment: B0→μ+μ−, B0s→μ+μ−, and B0s→μ+μ−γ. The latest and most precise results to date are presented for the first two decays, while the feasibility and experimental strategy for the third, yet unobserved at CMS, are discussed. [...]
CMS-CR-2025-098.- Geneva : CERN, 2025 - 7 p. Fulltext: PDF;
In : 31st Cracow Epiphany Conference on the recent LHC results (Epiphany 2025), Cracow, Poland, 13 - 17 Jan 2025

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2025-04-03
13:30
CMS searches for new physics in the Higgs sector / Szleper, Michal (NCBJ, Swierk) /CMS Collaboration
A summary is presented of CMS searches for new neutral resonances, with main focus on scalars and pseudoscalars, based on data collected during Run 2 of the LHC. Special emphasis is given to the most recent results..
CMS-CR-2025-085.- Geneva : CERN, 2025 - 11 p. Fulltext: PDF;
In : 31st Cracow Epiphany Conference on the recent LHC results (Epiphany 2025), Cracow, Poland, 13 - 17 Jan 2025

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2025-03-31
13:31
Recent Experience with the CMS Data Management System / Ozturk, Hasan (CERN) ; Paparrigopoulos, Panos (CERN) ; Manrique Ardila, Andres (Wisconsin U., Madison) ; Chauhan, Rahul (Wisconsin U., Madison) ; Ellis, Katy (Rutherford) ; Emmanouil, Christos (CERN) ; Kovalskyi, Dmytro (MIT) ; Vaandering, Eric Wayne (Fermilab) ; Voetberg, Margaret Grace (Fermilab) ; Wightman, Andrew Steven (Nebraska U.) /CMS Collaboration
The CMS experiment manages a large-scale data infrastructure, currently handling over 200 PB of disk and 500 PB of tape storage and transferring more than 1 PB of data per day on average between various WLCG sites. Utilizing Rucio for high-level data management, FTS for data transfers, and a variety of storage and network technologies at the sites, CMS confronts inevitable challenges due to the system's growing scale and evolving nature. [...]
CMS-CR-2025-055.- Geneva : CERN, 2025 - 9 p. Fulltext: PDF;
In : 27th International Conference on Computing in High Energy & Nuclear Physics, Kraków, Poland, 19 - 25 Oct 2024

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2025-03-24
13:03
CMS High Level Trigger(HLT) performance in Run 3 / Maity, Dipak (Bhubaneswar, NISER) /CMS Collaboration
The CMS experiment at CERN operates a two-stage trigger system to efficiently filter and record events of potential physics interest. The system consists of a hardware-based Level 1 (L1) trigger, which processes detector data at 40 MHz using fast electronics such as FPGAs and ASICs, reducing the data rate to around 110 kHz. [...]
CMS-CR-2025-083.- Geneva : CERN, 2025 - 5 p. Fulltext: PDF;
In : 26th DAE-BRNS High Energy Physics Symposium 2024, Varanasi, India, 19 - 23 Dec 2024

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