CERN Accelerating science

CERN Preprints

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2018-05-22
07:18
Blue and violet graviton spectra from a dynamical refractive index / Giovannini, Massimo
We show that the spectral energy distribution of relic gravitons mildly increases for frequencies smaller than the $\mu$Hz and then flattens out whenever the refractive index of the tensor modes is dynamical during a quasi-de Sitter stage of expansion. [...]
CERN-TH-2018-106 ; arXiv:1805.08142.
- 10 p.
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2018-05-22
07:18
Mass-improvement of the vector current in three-flavor QCD / Fritzsch, Patrick
We determine two improvement coefficients which are relevant to cancel mass-dependent cutoff effects in correlation functions with operator insertions of the non-singlet local QCD vector current. [...]
CERN-TH-2018-119 ; arXiv:1805.07401 ; CERN-TH-2018-119.
- 15 p.
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2018-05-21
07:43
A Realistic $U(2)$ Model of Flavor / Linster, Matthias ; Ziegler, Robert
We propose a simple $U(2)$ model of flavor compatible with an $SU(5)$ GUT structure. [...]
CERN-TH-2018-121 ; TTP18-019 ; CERN-TH-2018-121 ; TTP18-019 ; arXiv:1805.07341.
- 30 p.
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2018-05-21
07:42
Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions / Kurkela, Aleksi (CERN ; Stavanger U.) ; Mazeliauskas, Aleksas (Heidelberg U. ; Stony Brook U.) ; Paquet, Jean-François (Duke U. ; Stony Brook U.) ; Schlichting, Sören (Washington U., Seattle) ; Teaney, Derek (Stony Brook U.)
We develop a macroscopic description of the space-time evolution of the energy-momentum tensor during the pre-equilibrium stage of a high-energy heavy-ion collision. [...]
arXiv:1805.00961.
- 45 p.
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2018-05-19
23:27
Universal Imprints of a Pseudo-Nambu-Goldstone Higgs Boson / Liu, Da (Argonne) ; Low, Ian (Argonne ; Northwestern U. ; CERN) ; Yin, Zhewei (Northwestern U.)
A large class of models addressing the electroweak naturalness problem postulates the existence of new spontaneously broken global symmetries above the weak scale. [...]
arXiv:1805.00489 ; CERN-TH-2018-100.
- 5 p.
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2018-05-19
23:25
Effects of Resonant and Random Excitations on the Proton Beam in the Large Hadron Collider, with Applications to the Design of Pulsed Hollow Electron Lenses for Active Halo Control / Fitterer, Miriam (Fermilab) ; Stancari, Giulio (Fermilab) ; Valishev, Alexander (Fermilab) ; Redaelli, Stefano (CERN) ; Valuch, Daniel (CERN)
We present the results of numerical simulations and experimental studies about the effects of resonant and random excitations on proton losses, emittances, and beam distributions in the Large Hadron Collider (LHC). [...]
FERMILAB-PUB-18-084-AD-APC ; arXiv:1804.07418.
- 30 p.
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2018-05-19
18:58
Effects of Resonant and Random Excitations on the Proton Beam in the Large Hadron Collider, with Applications to the Design of Pulsed Hollow Electron Lenses for Active Halo Control / Fitterer, Miriam (Fermilab) ; Stancari, Giulio (Fermilab) ; Valishev, Alexander (Fermilab) ; Redaelli, Stefano (CERN) ; Valuch, Daniel (CERN)
We present the results of numerical simulations and experimental studies about the effects of resonant and random excitations on proton losses, emittances, and beam distributions in the Large Hadron Collider (LHC). [...]
FERMILAB-PUB-18-084-AD-APC ; arXiv:1804.07418.
- 30 p.
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2018-05-19
11:15
Characterisation of the Medipix3 detector for 60 and 80 keV electrons / Mir, J A (U. Oxford (main)) ; Clough, R (U. Oxford (main)) ; MacInnes, R (Glasgow U.) ; Gough, C (Glasgow U.) ; Plackett, R (Oxford U.) ; Shipsey, I (Oxford U.) ; Sawada, H (U. Oxford (main) ; Diamond Light Source ; JEOL UK Ltd., Welwyn Garden City) ; MacLaren, I (Glasgow U.) ; Ballabriga, R (CERN) ; Maneuski, D (Glasgow U.) et al.
In this paper we report quantitative measurements of the imaging performance for the current generation of hybrid pixel detector, Medipix3, used as a direct electron detector. [...]
2017. - 10 p.
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2018-05-19
11:15
Augmented and virtual reality based monitoring and safety system: A prototype IoT platform / Alam, Md Fasiul (Athens Natl. Capodistrian U.) ; Katsikas, Serafeim (Prisma Electronics SA, Greece) ; Beltramello, Olga (CERN) ; Hadjiefthymiades, Stathes (Athens Natl. Capodistrian U.)
This paper presents an Augmented and Virtual Reality (AR/VR) based IoT prototype system. [...]
2017. - 11 p.

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2018-05-19
11:15
Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process / Cova, Francesca (Milan Bicocca U.) ; Fasoli, Mauro (Milan Bicocca U.) ; Moretti, Federico (Milan Bicocca U.) ; Chiodini, Norberto (Milan Bicocca U.) ; Pauwels, Kristof (Milan Bicocca U.) ; Auffray, Etiennette (CERN) ; Toliman Lucchini, Marco (CERN) ; Bourret, Edith (LBNL, Berkeley) ; Veronese, Ivan (Milan U. ; INFN, Milan) ; d'Ippolito, Eduardo (Milan U.) et al.
The optical emission from the 5d – 4f allowed transition of Pr$^{3+}$ ions embedded in sol-gel silica is investigated for High Energy Physics applications requiring fast scintillating materials. [...]
2017. - 7 p.

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