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CERN Document Server 518,741 záznamov nájdených  začiatokpredošlý1099 - 1108ďalšíkoniec  skoč na záznam: Hľadanie trvalo 0.98 sekúnd. 
1099.
Enhanced reconstruction of dileptonic top quark-antiquark events using supervised machine learning methods / CMS Collaboration /CMS Collaboration
The reconstruction of the top quark-antiquark $\mathrm{t\bar{t}}$ kinematic system is crucial for precision measurements of top quark properties and plays a central role in many searches for beyond standard model physics involving top quarks at the LHC. In the dileptonic decay channel of $\mathrm{t\bar{t}}$, the presence of two neutrinos poses a significant challenge to reconstruct the $\mathrm{t\bar{t}}$ kinematic system. [...]
CMS-NOTE-2025-010; CERN-CMS-NOTE-2025-010.- Geneva : CERN, 2025 - 22 p. Fulltext: PDF;
Úplný záznam
1100.
Early Look at GEM-CSC Bending Angle Integration into the Level 1 Trigger /CMS Collaboration
The High Luminosity LHC (HL-LHC) planned to start in 2030 will supply a dramatic increase in pile up to the collision detectors. The CMS detector has many upgrades to handle this increase in pile up, including the Gas Electron Multiplier (GEM) subdetector system for the Muon System. [...]
CMS-DP-2025-069; CERN-CMS-DP-2025-069.- Geneva : CERN, 2025 - 7 p. Fulltext: PDF;
Úplný záznam
1101.
Exclusive dimuon production in ultraperipheral lead-lead collisions at 5.02 TeV /CMS Collaboration
Exclusive dimuon production in lead-lead collisions is investigated for the first time as a novel approach for luminosity determination at the LHC. This method exploits the well-established theoretical framework of quantum electrodynamics (QED) to provide an alternative measurement of luminosity based on the predicted production cross section. [...]
CMS-DP-2025-068; CERN-CMS-DP-2025-068.- Geneva : CERN, 2025 - 6 p. Fulltext: PDF;
Úplný záznam
1102.
PCC module selection and internal stability for 2024 luminosity measurement /CMS Collaboration
Starting from all BPIX/FPIX modules, we remove known problematic regions, veto noisy modules from vdM super-separation periods, perform block-by-block stability screening, and impose a year-wide linearity requirement. The resulting subset provides robust PCC luminosity with improved temporal stability, suitable for use with a single $\sigma_{\mathrm{vis}}$ once $R$ is corrected..
CMS-DP-2025-067; CERN-CMS-DP-2025-067.- Geneva : CERN, 2025 - 7 p. Fulltext: PDF;
Úplný záznam
1103.
HFET luminosity and afterglow corrections /CMS Collaboration
The HFET luminometer converts transverse-energy sums to luminosity but requires out-of-time corrections. We separate Type-1 spillover (electronics/timing) from Type-2 activation tails modeled as $A e^{-t/\tau_1}+B e^{-t/\tau_2}$, constrained with single-/few-bunch fills; after applying both, residual empty-BX signal approaches zero and cross-checks (e.g. [...]
CMS-DP-2025-066; CERN-CMS-DP-2025-066.- Geneva : CERN, 2025 - 14 p. Fulltext: PDF;
Úplný záznam
1104.
Z counting in 2024 /CMS Collaboration
$Z\to\ell\ell$ yields provide a physics-based cross-check of online luminosity. Fill-level and yearly trends of $Z/\text{online}$ remain stable at the percent level while reflecting updates to online calibrations (vdM/efficiency), validating the delivered luminosity scale independently of luminometer-specific assumptions..
CMS-DP-2025-065; CERN-CMS-DP-2025-065.- Geneva : CERN, 2025 - 4 p. Fulltext: PDF;
Úplný záznam
1105.
Emittance Scans in 2024 /CMS Collaboration
Routine emittance scans in physics fills probe linearity/stability across changing 2024 beam conditions. From scan fits (often preferring q-Gaussian/Double Gaussian over Single Gaussian with limited points), we derive $\sigma_{\mathrm{vis}}^{\mathrm{emitt}}$ and track efficiency trends versus delivered dose $\int \mathcal{L}\,dt$. [...]
CMS-DP-2025-064; CERN-CMS-DP-2025-064.- Geneva : CERN, 2025 - 16 p. Fulltext: PDF;
Úplný záznam
1106.
Reprocessing and integration results for luminosity measurement /CMS Collaboration
We detail the reprocessing used to deliver physics-quality luminosity from multiple luminometers: apply nonlinearity and stability corrections (e.g. $m=\ell(1+\alpha\ell)$), veto anomalies, and combine detectors consistently. [...]
CMS-DP-2025-063; CERN-CMS-DP-2025-063.- Geneva : CERN, 2025 - 18 p. Fulltext: PDF;
Úplný záznam
1107.
Luminosity calibration methods for Run 2 and Run 3 proton-proton data /CMS Collaboration
CMS calibrates luminosity in special fills using van der Meer scans, where detector rates satisfy $R(t)=\mathcal{L}(t)\,\sigma$. The visible cross section $\sigma_{\mathrm{vis}}$ is extracted from rate-separation fits, with beam widths $\Sigma_{x,y}$ inferred versus separations $\Delta_{x,y}$. [...]
CMS-DP-2025-062; CERN-CMS-DP-2025-062.- Geneva : CERN, 2025 - 69 p. Fulltext: PDF;
Úplný záznam
1108.
CMS results on top quark properties / Tsai, Emily Minyun (Northeastern U.) /CMS Collaboration
Top quarks have interesting properties that make them useful as probes of standard model (SM) properties, as well as in searches for new physics. In these proceedings, two recent results from the CMS collaboration on top quark properties are presented. [...]
CMS-CR-2025-183.- Geneva : CERN, 2025 - 7 p. Fulltext: PDF;
In : 13th Edition of the Large Hadron Collider Physics Conference (LHCP2025), Taipei, Tw, 5 - 9 May 2025
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