CMS Conference Reports

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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 \times 10^{34} {cm}^{- 2} s^{- 1}

$7.5 \times 10^{34} \, \text{cm}^{-2}\text{s}^{-1}$ and an integrated luminosity of

300 {fb}^{- 1}

$300 \, \text{fb}^{-1}$ 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

Φ_{eq} = 2.6 \times 10^{16} {cm}^{- 2}

$\Phi_{\text{eq}} = 2.6 \times 10^{16} \, \text{cm}^{-2}$ and a total ionizing dose of

13 MGy

$13 \, \text{MGy}$ after

3000 {fb}^{- 1}

$3000 \, \text{fb}^{-1}$ 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 10

^{34}

$^{34}$ cm

^{- 2}

$^{-2}$ s

^{- 1}

$^{-1}$ 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 $\eta \to 4 \mu$ decay with the CMS detector / Rossin, Roberto (INFN, Padua ; Padua U.) /CMS Collaboration
The first observation of the rare

η \to μ^{+} μ^{-} μ^{+} μ^{-}

$\eta \to \mu^+\mu^-\mu^+\mu^-$ 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

\sqrt{s} = 13 T e V

$\sqrt{s}=13\, {\rm TeV}$ . [...]
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:

B^{0} \to μ^{+} μ^{-}

$B^{0} \to \mu^+ \mu^-$ ,

B_{s}^{0} \to μ^{+} μ^{-}

$B_{s}^{0} \to \mu^+ \mu^-$ , and

B_{s}^{0} \to μ^{+} μ^{-} γ

$B_{s}^{0} \to \mu^+ \mu^- \gamma$ . 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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2025-03-21
10:53

Measurement of $W^+W^-$ production cross-section at 13.6 TeV with the CMS experiment / Phor, Saumya (Delhi U.) /CMS Collaboration
The first measurements of

W^{+} W^{-}

$W^{+}W^{-}$ production cross section in proton-proton collisions at a centre-of-mass energy of 13.6 TeV are presented. The data used were recorded with the CMS detector at the LHC in 2022, corresponding to an integrated luminosity of 34.8 fb

^{- 1}

$^{-1}$ . The events are selected by requiring one electron and one muon of opposite charge. The total inclusive

W^{+} W^{-}

$W^+W^-$ cross section is measured to be

125.7 \pm 5.6

$125.7 \pm 5.6$ ~pb, consistent with the standard model predictions. Fiducial cross sections are also reported as a function of the jet multiplicity in the event and compared with different theoretical predictions..
CMS-CR-2025-067.- 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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2025-03-17
15:00

Experience with the alpaka performance portability library in the CMS software / ius ; ejdl
To achieve better computational efficiency and exploit a wider range of computing resources, the CMS software framework (CMSSW) has been extended to offload part of the physics reconstruction to NVIDIA GPUs. To support additional back-ends, as well to avoid the need to write, validate and maintain a separate implementation of the reconstruction algorithms for each back-end, CMS has adopted the Alpaka performance portability library. Alpaka (Abstraction Library for Parallel Kernel Acceleration) is a header-only C++ library that provides performance portability across different back-ends, abstracting the underlying levels of parallelism. [...]
CMS-CR-2025-095.- Geneva : CERN, 2025 - 9 p. Fulltext: PDF;
In : 27th International Conference on Computing in High Energy & Nuclear Physics, Kraków, Pl, 19 - 25 Oct 2024

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