CERN Accelerating science

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1.
Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer / AMS Collaboration
Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of the deuteron (D) flux are presented. The measurements are based on 21×106 D nuclei in the rigidity range from 1.9 to 21 GV collected from May 2011 to April 2021. [...]
2024 - 8 p. - Published in : Phys. Rev. Lett. 132 (2024) 261001 Fulltext: PDF;
2.
Properties of Cosmic-Ray Sulfur and Determination of the Composition of Primary Cosmic-Ray Carbon, Neon, Magnesium, and Sulfur: Ten-Year Results from the Alpha Magnetic Spectrometer / AMS Collaboration
We report the properties of primary cosmic-ray sulfur (S) in the rigidity range 2.15 GV to 3.0 TV based on 0.38×106 sulfur nuclei collected by the Alpha Magnetic Spectrometer experiment (AMS). We observed that above 90 GV the rigidity dependence of the S flux is identical to the rigidity dependence of Ne-Mg-Si fluxes, which is different from the rigidity dependence of the He-C-O-Fe fluxes. [...]
2023 - 9 p. - Published in : Phys. Rev. Lett. 130 (2023) 211002 Fulltext: PDF;
3.
The Alpha Magnetic Spectrometer (AMS) on the International Space Station. I: Results from the test flight on the space shuttle / AMS Collaboration
The Alpha Magnetic Spectrometer (AMS) was flown on the space shuttle Discovery during flight STS-91 (June 1998) in a 51.7° orbit at altitudes between 320 and 390 km . A search for antihelium nuclei in the rigidity range 1– 140 GV was performed. [...]
2002 - 75 p. - Published in : Phys. Rep. 366 (2002) 331-405
- Published in : Phys. Rep. 380 (2003) 97-98
4.
The LHC Beam Gas Vertex Detector - a Non-Invasive Profile Monitor for High Energy Machines / Vlachos, Sotiris (CERN) ; Alexopoulos, Andreas (CERN) ; Barchel, Colin (CERN ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Bay, Aurelio (Ecole Polytechnique, Lausanne) ; Blanc, Frederic (Ecole Polytechnique, Lausanne) ; Bravin, Enrico (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chritin, Nicolas (CERN) ; Dehning, Bernd (CERN) ; Ferro-Luzzi, Massimiliano (CERN) et al.
The Beam Gas Vertex (BGV) monitor is being developed as part of the High Luminosity LHC project with the aim of providing measurements with less than 5% error on the beam size with an integration time of 5 minutes. It will be the only instrument capable of non-invasive beam size measurement throughout the LHC acceleration cycle with high intensity physics beams. [...]
2018 - 7 p. - Published in : 10.18429/JACoW-IBIC2017-WE3AB1 Fulltext: PDF;
In : 6th International Beam Instrumentation Conference, Grand Rapids, MI, USA, 20 -24 Aug 2017, pp.WE3AB1
5.
First LHC transverse beam size measurements with the beam gas vertex detector / Alexopoulos, A (CERN) ; Barchel, C (CERN) ; Bay, A (Ecole Polytechnique, Lausanne) ; Blanc, F (Ecole Polytechnique, Lausanne) ; Bravin, E (CERN) ; Bregliozzi, G (CERN) ; Chritin, N (CERN) ; Dehning, B (CERN) ; Ferro-Luzzi, M (CERN) ; Gianì, S (Ecole Polytechnique, Lausanne) et al.
The Beam Gas Vertex detector (BGV) is an innovative beam profile monitor based on the reconstruction of beam-gas interaction vertices which is being developed as part of the High Luminosity LHC project. Tracks are identified using several planes of scintillating fibres, located outside the beam vacuum chamber and perpendicular to the beam axis. [...]
CERN-ACC-2017-315.- 2017 - 6 p. - Published in : J. Phys.: Conf. Ser. 874 (2017) 012086
- Published in : (2017) , pp. TUOAB1 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUOAB1
6.
Scanners for the quality contol of scintillating plastic fibres / Rodigues, Ana Barbara (Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil) ; Ekelhof, Robert (Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany) ; Garnier, Francois (CERN) ; Giudici, Pierre-Ange (CERN) ; Greim, Roman (I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany) ; Hebler, Philip (Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany) ; Joram, Christian (CERN) ; Kirn, Thomas (I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany) ; Pierschel, Gerhard (I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany) ; Schateikis, Tobias (I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany) et al.
The use of scintillating plastic fibres in the SciFi tracker requires rigorous quality control. The fibre diameter and in particular local variations in form of bumps and necks have an impact on the regularity of the winding pattern and hence the spatial resolution. [...]
LHCb-PUB-2015-009; CERN-LHCb-PUB-2015-009.- Geneva : CERN, 2015 - 23. Fulltext: PDF;
7.
Finite Element Analysis of the SciFi-Nomex-Sandwich Panels / Schultz von Dratzig, Arndt (I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany)
A finite element analysis of the SciFi-Nomex-sandwich panels has been carried out in order to investigate their thermo-mechanical properties. This does not include the cooling of the silicon photomultipliers but is restricted to the panels themselves. [...]
LHCb-PUB-2015-007; CERN-LHCb-PUB-2015-007.- Geneva : CERN, 2015 Fulltext: PDF;
8.
A Beam Gas Vertex detector for beam size measurement in the LHC / Hopchev, P (CERN) ; Baglin, V (CERN) ; Barschel, C (CERN) ; Bravin, E (CERN) ; Bregliozzi, G (CERN) ; Chritin, N (CERN) ; Dehning, B (CERN) ; Ferro-Luzzi, M (CERN) ; Gaspar, C (CERN) ; Giovannozzi, M (CERN) et al.
The Beam Gas Vertex (BGV) detector is foreseen as a possible non-invasive beam size measurement instrument for the LHC and its luminosity upgrade. This technique is based on the reconstruction of beam-gas interaction vertices, where the charged particles produced in inelastic beam-gas interactions are measured with high-precision tracking detectors. [...]
CERN-ACC-2014-0134.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF; External link: Published version from JaCoW
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.3680
9.
A New Boson with a Mass of 125 GeV Observed with the CMS Experiment at the Large Hadron Collider / CMS Collaboration
The Higgs boson was postulated nearly five decades ago within the framework of the standard model of particle physics and has been the subject of numerous searches at accelerators around the world. Its discovery would verify the existence of a complex scalar field thought to give mass to three of the carriers of the electroweak force—the W+, W–, and Z0 bosons—as well as to the fundamental quarks and leptons. [...]
Geneva : CERN, 2012 - 16 p. - Published in : Science 338 (2012) 1569-1575 Preprint: PDF; External link: Supplementary material
In : Breakthrough of the year
10.
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC / CMS Collaboration
Results are presented from searches for the standard model Higgs boson in proton-proton collisions at $\sqrt{s}$=7 and 8 TeV in the CMS experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 inverse femtobarns at 7 TeV and 5.3 inverse femtobarns at 8 TeV. The search is performed in five decay modes: $\gamma\gamma$, ZZ, WW, $\tau^+ \tau^-$, and $b\bar{b}$. [...]
arXiv:1207.7235; CMS-HIG-12-028; CERN-PH-EP-2012-220; CMS-HIG-12-028; CERN-PH-EP-2012-220.- Geneva : CERN, 2012-08-17 - 32 p. - Published in : Phys. Lett. B 716 (2012) 30-61 Elsevier Open Access article: PDF; Fulltext: PDF; External links: Press Release; Interactions.org article; DOE Science Highlight
In : Higgs booklet, pp.30

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