CERN Accelerating science

CERN Published Articles

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2017-04-27
07:25
Phenomenological and Experimental Developments in Charm Physics: The WG7 Report from CKM 2016 / Casarosa, Giulia (Mainz U., Inst. Kernphys.) ; Di Canto, Angelo (CERN) ; Paul, Ayan (INFN, Rome)
We present an overview of recent developments in charm physics reported in the Working~Group~7 meetings of the CKM 2016 workshop. Progresses in experimental analysis and techniques were reported by LHCb, Belle, BABAR and BESIII along with projections for the future. [...]
arXiv:1704.00041.- 2017-03-31 - 12 p. - Published in : PoS: CKM2016 (2016) , pp. 020 Preprint: PDF;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016, pp.020

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2017-04-27
06:06
Dynamic federation of grid and cloud storage / Furano, Fabrizio (CERN) ; Keeble, Oliver (CERN) ; Field, Laurence (CERN)
The Dynamic Federations project (“Dynafed”) enables the deployment of scalable, distributed storage systems composed of independent storage endpoints. While the Uniform Generic Redirector at the heart of the project is protocol-agnostic, we have focused our effort on HTTP-based protocols, including S3 and WebDAV. [...]
2016 - 5 p. - Published in : Phys. Part. Nucl. Lett. 13 (2016) 629-633

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2017-04-27
06:06
Beam formation in CERNs cesiated surfaces and volume H$^−$ ion sources / Mochalskyy, Serhiy (Garching, Max Planck Inst. Plasmaphys.) ; Lettry, Jacques (CERN) ; Minea, Tiberiu (LPGP, Orsay)
At CERN, a high performance negative ion (NI) source is required for the 160 MeV H(−) linear accelerator named Linac4. The source should deliver 80 mA H(−) ion beams within an emittance of 0.25 mm·mrad. [...]
2016 - 11 p. - Published in : New J. Phys. 18 (2016) 085011

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2017-04-27
06:06
Simulation of the High Performance Time to Digital Converter for the ATLAS Muon Spectrometer trigger upgrade / Meng, X T (Lanzhou U. ; Michigan U.) ; Levin, D S (Michigan U.) ; Chapman, J W (Michigan U.) ; Zhou, B (Michigan U.)
The ATLAS Muon Spectrometer endcap thin-Resistive Plate Chamber trigger project compliments the New Small Wheel endcap Phase-1 upgrade for higher luminosity LHC operation. These new trigger chambers, located in a high rate region of ATLAS, will improve overall trigger acceptance and reduce the fake muon trigger incidence. [...]
2016 - Published in : J. Instrum. 11 (2016) P09002

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2017-04-27
06:06
Evidence for Gamow-Teller Decay of $^{78}$Ni Core from Beta-Delayed Neutron Emission Studies / Madurga, M (Tennessee U. ; CERN) ; Paulauskas, S  V (Tennessee U.) ; Grzywacz, R (Tennessee U. ; Oak Ridge) ; Miller, D (Tennessee U.) ; Bardayan, D  W (Oak Ridge) ; Batchelder, J  C (UC, Berkeley, Nucl. Eng. Dept.) ; Brewer, N  T (Oak Ridge) ; Cizewski, J  A (Rutgers U., Piscataway) ; Fijałkowska, A (Warsaw U.) ; Gross, C  J (Oak Ridge) et al.
The β-delayed neutron emission of Ga83,84 isotopes was studied using the neutron time-of-flight technique. The measured neutron energy spectra showed emission from states at excitation energies high above the neutron separation energy and previously not observed in the β decay of midmass nuclei. [...]
2016 - 6 p. - Published in : Phys. Rev. Lett. 117 (2016) 092502 Fulltext: PDF;

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2017-04-27
06:06
Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station / Aguilar, M (Madrid, CIEMAT) ; Ali Cavasonza, L (JARA, Aachen) ; Alpat, B (INFN, Perugia) ; Ambrosi, G (INFN, Perugia) ; Arruda, L (LIP, Lisbon) ; Attig, N (Julich, NIC ; Unlisted, DE) ; Aupetit, S (LPSC, Grenoble) ; Azzarello, P (Geneva U.) ; Bachlechner, A (JARA, Aachen) ; Barao, F (LIP, Lisbon) et al. /AMS
A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49×105 antiproton events and 2.42×109 proton events. The fluxes and flux ratios of charged elementary particles in cosmic rays are also presented. [...]
2016 - 10 p. - Published in : Phys. Rev. Lett. 117 (2016) 091103 Fulltext: PDF;

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2017-04-27
06:06
A review of the discovery of SM-like Higgs boson in H $\boldsymbol {\rightarrow }\!\! \boldsymbol {\gamma }\boldsymbol {\gamma }$ decay channel with the CMS detector at the LHC / Bhattacharya, Satyaki (Saha Inst.) ; Jain, Shilpi (Taiwan, Natl. Central U.)
In this review we have outlined a very brief history of the Higgs boson search and the development of the strategies for searching for the Higgs boson in its diphoton decay channel. We have reviewed the methodology and tools that led to the first observation of the Higgs boson decaying to a pair of photons. [...]
2016 - Published in : Pramana - J. Phys. 87 (2016) 35

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2017-04-27
06:06
High-efficiency deflection of high energy protons due to channeling along the 〈110〉 axis of a bent silicon crystal / Scandale, W (CERN ; Orsay, LAL ; INFN, Rome) ; Arduini, G (CERN) ; Butcher, M (CERN) ; Cerutti, F (CERN) ; Garattini, M (CERN) ; Gilardoni, S (CERN) ; Lechner, A (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Montesano, S (CERN) et al.
A deflection efficiency of about 61% was observed for 400 GeV/c protons due to channeling, most strongly along the 〈110〉 axis of a bent silicon crystal. It is comparable with the deflection efficiency in planar channeling and considerably larger than in the case of the 〈111〉 axis. [...]
2016 - 6 p. - Published in : Phys. Lett. B 760 (2016) 826-831 Article from SCOAP3: PDF;

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2017-04-27
06:06
Development Status of a 2-m Model Magnet of Beam Separation Dipole for the HL-LHC Upgrade / Sugano, M (KEK, Tsukuba) ; Enomoto, S (KEK, Tsukuba) ; Nakamoto, T (KEK, Tsukuba) ; Kawamata, H (KEK, Tsukuba) ; Okada, N (KEK, Tsukuba) ; Okada, R (KEK, Tsukuba) ; Higashi, N (KEK, Tsukuba) ; Ogitsu, T (KEK, Tsukuba) ; Sasaki, K (KEK, Tsukuba) ; Kimura, N (KEK, Tsukuba) et al.
The high-luminosity Large Hadron Collider (HL-LHC) upgrade project aims to increase the LHC peak luminosity up to 5×10^34 cm^-2s^-1 and the integrated luminosity up to3000 fb^-1. To achieve this goal, the quadrupole and dipole magnets around the two interaction points, i.e., the ATLAS and the CMS, will be upgraded. [...]
2016 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4002606

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2017-04-27
06:06
Development of a 200-mm Short Model of Beam Separation Dipole for HL-LHC Upgrade / Enomoto, S (KEK, Tsukuba) ; Sugano, M (KEK, Tsukuba) ; Nakamoto, T (KEK, Tsukuba) ; Kawamata, H (KEK, Tsukuba) ; Okada, R (KEK, Tsukuba) ; Okada, N (KEK, Tsukuba) ; Higashi, N (KEK, Tsukuba) ; Ogitsu, T (KEK, Tsukuba) ; Sasaki, K (KEK, Tsukuba) ; Kimura, N (KEK, Tsukuba) et al.
The High Energy Accelerator Research Organization (KEK) has been developing the beam separation dipole magnet for the High Luminosity Large Hadron Collider (HL-LHC) upgrade. The magnet has a coil aperture of 150 mm, using Nb-Ti superconducting cable, and a dipole magnetic field of 5.6 T will be generated at 12 kA, at 1.9 K, to provide the field integral of 35 T·m. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4001905

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