CERN Accelerating science

CERN Document Server 19 ჩანაწერია ნაპოვნი  1 - 10შემდეგი  ჩანაწერთან გადასვლა: ძიებას დასჭირდა 1.35 წამი. 
1.
MuCol Milestone Report No. 5: Preliminary Parameters / MuCoL Collaboration
This document is comprised of a collection of updated preliminary parameters for the key parts of the muon collider. [...]
arXiv:2411.02966.
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Fermilab Library Server - Fulltext - Fulltext
2.
Acceleration of electromagnetic shower development and enhancement of light yield in oriented scintillating crystals / Soldani, Mattia (Frascati) ; Monti-Guarnieri, Pietro (INFN, Trieste ; Trieste U.) ; Selmi, Alessia (Insubria U., Como ; Milan Bicocca U.) ; Argiolas, Nicola (Padua U. ; INFN, Legnaro) ; Bomben, Luca (Insubria U., Como ; Milan Bicocca U.) ; Brizzolari, Claudia (Insubria U., Como ; Milan Bicocca U.) ; Canale, Nicola (INFN, Ferrara) ; Carsi, Stefano (Insubria U., Como ; Milan Bicocca U.) ; Charitonidis, Nikolaos (CERN) ; De Salvador, Davide (Padua U. ; INFN, Legnaro) et al.
We observed a substantial increase of the scintillation light output of lead tungstate (PbWO$_4$) at a small incidence angle with respect to two main lattice axes. [...]
arXiv:2404.12016.
- 6 p.
Fulltext
3.
Characterization of bent crystals for beam collimation with 6.8 TeV proton beams at the LHC / D'Andrea, Marco (CERN) ; Aberle, Oliver (CERN) ; Abramov, Andrey (CERN) ; Bandiera, Laura (INFN, Ferrara) ; Bruce, Roderik (CERN) ; Cai, Rongrong (CERN ; EPFL-ISIC, Lausanne) ; Calviani, Marco (CERN) ; Demassieux, Quentin (CERN) ; Dewhurst, Kay Alana (CERN) ; Di Castro, Mario (CERN) et al.
The concept of crystal collimation exploits the peculiar properties of crystalline materials to deflect high-energy beam particles at angles orders of magnitude larger than what can be achieved with scattering by conventional materials used as primary collimators. This innovative technique is planned to be used to improve the collimation efficiency with heavy-ion beams at the Large Hadron Collider (LHC) and its High-Luminosity upgrade (HL-LHC). [...]
2023 - 8 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1060 (2024) 169062 Publication: PDF;
In : 9th International Conference on Charged & Neutral Particles Channeling Phenomena (Channeling 2023), Riccione, Italy, 4 - 9 June 2023, pp.169062
4.
Measurement of the $K^+ \to \pi^+ \gamma \gamma$ decay / NA62 Collaboration
A sample of 3984 candidates of the $K^+ \to \pi^+ \gamma \gamma$ decay, with an estimated background of $291 \pm 14$ events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. [...]
arXiv:2311.01837; CERN-EP-2023-247.- Geneva : CERN, 2024-02-07 - 11 p. - Published in : Phys. Lett. B 850 (2024) 138513 Draft (restricted): PDF; Fulltext: CERN-EP-2023-247 - PDF; 2311.01837 - PDF; Publication - PDF;
5.
Search for $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state / NA62 Collaboration
The first search for ultra-rare $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017-2018. An upper limit of $1.4\times 10^{-8}$ at 90% CL is obtained for the branching ratio of the $K^+\to\pi^+e^+e^-e^+e^-$ decay, predicted in the Standard Model to be $(7.2 \pm0 .7)\times 10^{-11}$. [...]
arXiv:2307.04579; CERN-EP-2023-133.- Geneva : CERN, 2023-09-22 - 9 p. - Published in : Phys. Lett. B 846 (2023) 138193 Draft (restricted): PDF; Fulltext: CERN-EP-2023-133 - PDF; Publication - PDF; 2307.04579 - PDF;
6.
Towards a Muon Collider / Accettura, Carlotta (CERN) ; Adams, Dean (Rutherford) ; Agarwal, Rohit (UC, Berkeley (main)) ; Ahdida, Claudia (CERN) ; Aimè, Chiara (Pavia U. ; INFN, Pavia) ; Amapane, Nicola (INFN, Turin ; Turin U.) ; Amorim, David (CERN) ; Andreetto, Paolo (INFN, Padua) ; Anulli, Fabio (INFN, Rome) ; Appleby, Robert (Manchester U.) et al.
A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. [...]
arXiv:2303.08533; FERMILAB-PUB-23-123-AD-PPD-T.- 2023-09-26 - 118 p. - Published in : Eur. Phys. J. C
- Published in : Eur. Phys. J. C Fulltext: 2303.08533 - PDF; FERMILAB-PUB-23-123-AD-PPD-T - PDF; Fulltext from Publisher: PDF; External links: JLab Document Server; Fermilab Library Server
7.
A study of the $K^+ \to \pi^0 e^+ \nu \gamma$ decay / NA62 Collaboration
A sample of $1.3 \times 10^5 K^+ \to \pi^0 e^+ \nu \gamma$ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017-2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. [...]
arXiv:2304.12271; CERN-EP-2023-069.- Geneva : CERN, 2023-09-07 - 16 p. - Published in : JHEP 2309 (2023) 040 Draft (restricted): PDF; Fulltext: CERN-EP-2023-069 - PDF; 2304.12271 - PDF; document - PDF;
8.
Search for dark photon decays to $\mu^+ \mu^-$ at NA62 / NA62 Collaboration
The NA62 experiment at CERN, designed to study the ultra-rare decay $K^+ \rightarrow \pi^+ \nu \bar\nu$, has also collected data in beam-dump mode. In this configuration, dark photons may be produced by protons dumped on an absorber and reach a decay volume beginning 80 m downstream. [...]
arXiv:2303.08666; CERN-EP-2023-032.- Geneva : CERN, 2023-09-06 - 23 p. - Published in : JHEP 2309 (2023) 035 Draft (restricted): PDF; Fulltext: CERN-EP-2023-032 - PDF; document - PDF; 2303.08666 - PDF;
9.
Improved calorimetric particle identification in NA62 using machine learning techniques / NA62 Collaboration
Measurement of the ultra-rare $K^+\to\pi^+\nu\bar\nu$ decay at the NA62 experiment at CERN requires high-performance particle identification to distinguish muons from pions. Calorimetric identification currently in use, based on a boosted decision tree algorithm, achieves a muon misidentification probability of $1.2\times 10^{-5}$ for a pion identification efficiency of 75% in the momentum range of 15$-$40 GeV/$c$. [...]
arXiv:2304.10580; CERN-EP-2023-066.- Geneva : CERN, 2023-11-21 - 13 p. - Published in : JHEP 2311 (2023) 138 Draft (restricted): PDF; Fulltext: 2304.10580 - PDF; document - PDF; CERN-EP-2023-066 - PDF;
10.
The `quasi-mosaic' effect in crystals and its applications in modern physics / Camattari, Riccardo (Ferrara U. ; INFN, Ferrara) ; Guidi, Vincenzo (Ferrara U. ; INFN, Ferrara) ; Bellucci, Valerio (Ferrara U. ; INFN, Ferrara) ; Mazzolari, Andrea (Ferrara U. ; INFN, Ferrara)
`Quasi-mosaicity' is an effect of anisotropy in crystals that permits one to obtain a curvature of internal crystallographic planes that would be flat otherwise. The term `quasi-mosaicity' was introduced by O. [...]
JAC, 2015 - 13 p. - Published in : J. Appl. Crystallogr. 48 (2015) 977-989

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