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2025-03-04
06:16
Observation of direct CP violation in $D^0$ meson decays at LHCb / Betti, Federico (Bologna U. ; INFN, Bologna)
A search for charge-parity (CP) violation in $D^0$ $\to$ $K^-K^+$ and $D^0$ $\to$ $\pi^- \pi^+$ decays is reported, using $pp$ collision data corresponding to an integrated luminosity of 5.9 fb$^{-1}$ collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the $D^0$ meson is determined from the charge of the pion in $D*$(2010)$^+ \to D^0$ $\pi^+$ decays or from the charge of the muon in $\bar{B} \to$ $D^0 \mu^-$ $\bar{\nu}_{\mu} X$ decays. [...]
2020 - 6 p. - Published in : Nuovo Cimento C 43 (2020) 41 Fulltext: PDF;
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.41

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2025-03-03
17:29
Modeling X-Y Beam Distributions via Crossing of Coupled Resonances in an Accelerator Complex / Lamb, Elleanor
Key words: luminosity, van der Meer, non-factorization, resonance, calibration, losses In high-energy colliders, discoveries are made possible by improving precision and accuracy of the measured rare events. Precision is maximized by increasing the collider integrated luminosity, whereas accuracy is addressed by minimizing the systematic errors via ad-hoc luminosity calibrations of the detectors. [...]
CERN-THESIS-2024-348.- 140 p. Fulltext: PDF; External link: Approve this document (restricted)

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2025-03-03
15:16
Characterization, Control and Alignment of Crystal Collimators of the High Luminosity Large Hadron Collider (HL-LHC) / Ricci, Gianmarco (Sapienza Universita e INFN, Roma I (IT))
The Large Hadron Collider (LHC), the world’s most powerful particle accelerator, is undergoing a significant upgrade to increase both its luminosity and operational lifespan. The LHC upgrade project is referred to as the High-Luminosity Large Hadron Collider (HL-LHC). [...]
CERN-THESIS-2024-347.- 149 p. Fulltext: PDF; External link: Approve this document (restricted)

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2025-02-28
10:45
Report Accelerator Complex Availability 2024 / Felsberger, Lukas (CERN) ; Alexaki, Paraskevi (National and Kapodistrian University of Athens (GR)) ; Asko, Anti (CERN) ; Charitonidis, Nikolaos (CERN) ; Heron, Jack (CERN) ; Mikulec, Bettina (CERN) ; Rae, Bastien (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN)
This document summarises the availability of the CERN Accelerator Complex during 2024. [...]
CERN-ACC-NOTE-2025-0003. - 2025
Full text

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2025-02-21
14:58
Short Summaries of the ATS Seminars in 2024 / Metral, Elias (CERN) ; Dallocchio, Alessandro (CERN) ; Modena, Michele (CERN) ; Stora, Thierry (CERN)
Five ATS seminars took place in 2024 (https://indico.cern.ch/category/2725/). [...]
CERN-ACC-NOTE-2025-0002. - 2025 - 16.
Full text

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2025-02-20
09:01
Advancing LHC Superconducting Circuit Models through Closed-Loop Multi-Objective Optimization / Gorenflo, Max Heinrich
The Large Hadron Collider (LHC) comprises eight individual main dipole circuits (RB), each containing 154 superconducting magnets [...]
CERN-THESIS-2024-337 - 2024 - 109.


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2025-02-19
15:15
LHC Effective Model for Optics Corrections / Le Garrec, Mael
This thesis investigates the crucial role of higher-order magnetic fields and non-linear optics in the stability and performance of particle accelerators, focusing on the Large Hadron Collider (LHC) at CERN [...]
CERN-THESIS-2024-336 - 2025 - 249.


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2025-02-18
06:49
Status and challenges of Nb$_3$Sn accelerator magnets at CERN : Lessons learned from ITER to HL-LHC / Devred, A
The High-Luminosity Large Hadron Collider (HL-LHC) project at CERN has offered the opportunity to promote and develop various types of enabling accelerator technologies, such as MgB$_2$ superconducting links for cold powering and Nb$_3$Sn accelerator magnets for the interaction regions where the t [...]
CERN-2025-003 - 2025 - 194. (CERN Yellow Reports: Monographs ; 3/2025)


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2025-02-18
06:48
Transforming Concept into Reality: Overcoming Challenges in the HL-LHC IT String Test Stand Implementation / Bajko, M (CERN) ; Blanchard, S (CERN) ; Bozzini, D (CERN) ; Bruning, O (CERN) ; Garcia, N Heredia (CERN) ; Zerlauth, M (CERN) ; Yammine, S (CERN)
The objective of the High-Luminosity Large Hadron Collider (HL-LHC) Inner Triplet (IT) String is to faithfully represent and validate, within a surface building at CERN, the installation and collective behavior of all major systems in the new HL-LHC IT zone. These systems encompass superconducting magnets, protection, cryogenics for the superconducting magnets and the superconducting link, powering, vacuum, alignment, interconnections between magnets, and the superconducting link itself. [...]
2025 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 35 (2025) 1-5 Fulltext: PDF;

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2025-02-18
06:48
Radiological Zoning and Clearance Methodology of activated cables in the LHC accelerator at CERN / Dyrcz, Patrycja (CERN) ; Infantino, Angelo (CERN) ; Menaa, Nabil (CERN) ; El-Idrissi, Safouane (CERN) ; Vincke, Heinz (CERN)
In the context of upgrading the Large Hadron Collider (LHC) to its High-Luminosity (HL-LHC) configuration, it is essential to conduct a thorough zoning classification and characterization of activated cables within the particle accelerator. To address this need, a methodology was developed to identify regions where materials can be cleared from regulatory control in compliance with the Swiss Radiation Protection Legislation. The study begins with optimizing the elemental composition of cables and validating Monte Carlo FLUKA simulations using high-energy resolution gamma spectrometry (GS) and total gamma counting (TGC) measurements on 19 copper cable samples, collected during the winter shutdown 2023/2024. This methodology enables performing radiological zoning and accurately defines the radiological classification of the cables installed in the LHC Points 1 and 5, including both the accelerator tunnel and service galleries, prior to dismantling. Finally, the study proposes a conservative scaling factor for cable zoning and introduces a TGC figure of merit (FOM), representing a conservative activation scenario for the copper cable types..
2025 - 11 p. - Published in : Appl. Radiat. Isot. 218 (2025) 111692 Fulltext: PDF;

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特辑:
High Luminosity Large Hadron Collider (HL-LHC) (1,225)
HiLumi LHC (264)