CERN Accelerating science

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2015-07-07
07:57
Turbulence-induced persistence in laser beam wandering / Zunino, Luciano ; Gulich, Damián ; Funes, Gustavo ; Pérez, Darío G
We have experimentally confirmed the presence of long-memory correlations in the wandering of a thin Gaussian laser beam over a screen after propagating through a turbulent medium. A laboratory-controlled experiment was conducted in which coordinate fluctuations of the laser beam were recorded at a sufficiently high sampling rate for a wide range of turbulent conditions. [...]
arXiv:1507.01502.- 2015 - 4 p. - Published in : Issue 13 (2015) 3145-3148 External link: Preprint

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2015-07-07
07:57
Inner-shell photoionization and core-hole decay of Xe and XeF$_2$ / Southworth, Stephen H ; Wehlitz, Ralf ; Picón, Antonio ; Lehmann, C Stefan ; Cheng, Lan ; Stanton, John F
Photoionization cross sections and partial ion yields of Xe and XeF$_2$ from Xe 3d$_{5/2}$, Xe 3d$_{3/2}$, and F 1s subshells in the 660--740 eV range are compared to explore effects of the F ligands. The Xe 3d - $\epsilon$f continuum shape resonances dominate the photoionization cross sections of both the atom and molecule, but prominent resonances appear in the XeF$_2$ cross section due to nominal excitation of Xe 3d and F 1s electrons to the lowest unoccupied molecular orbital (LUMO), a delocalized anti-bonding MO. [...]
arXiv:1507.01493.- 2015 - Published in : The Journal of Chemical Physics 142 (2015) 224302 External link: Preprint

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2015-07-07
07:57
Demonstration of novel high-power acoustic through-the-wall sensor / Felber, Franklin
A high-power acoustic sensor, capable of detecting and tracking persons through steel walls of cargo containers, trailer truck bodies, and train cars, has been developed and demonstrated. The sensor is based on a new concept for narrowband mechanical-impact acoustic transmitters and matched resonant receivers. [...]
arXiv:1507.01479.- 2015 - 15 p. - Published in : Proc. SPIE 9456, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security, Defense, and Law Enforcement XIV, 945603 (May 14, 2015) External link: Preprint

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2015-07-07
07:57
Scaling and optimal synergy: Two principles determining microbial growth in complex media / Massucci, Francesco Alessandro ; Guimerà, Roger ; Amaral, Luís A Nunes ; Sales-Pardo, Marta
High-throughput experimental techniques and bioinformatics tools make it possible to obtain reconstructions of the metabolism of microbial species. Combined with mathematical frameworks such as flux balance analysis, which assumes that nutrients are used so as to maximize growth, these reconstructions enable us to predict microbial growth. [...]
arXiv:1507.01463.- 2015 - 31 p. - Published in : Phys. Rev. E 91, 062703 -- Published 8 June 2015 External link: Preprint

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2015-07-07
07:57
Differential Dynamic Microscopy: Probing wave vector dependent dynamics with a microscope / Cerbino, Roberto ; Trappe, Veronique
We demonstrate the use of an ordinary white-light microscope for the study of the q-dependent dynamics of colloidal dispersions. Time series of digital video images are acquired in bright field with a fast camera and image differences are Fourier-analyzed as a function of the time delay between them. [...]
arXiv:1507.01344.- 2015 - Published in : Phys. Rev. Lett. 100 (2008) 188102 External link: Preprint

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2015-07-07
07:57
Preferential Attachment in an Internet-mediated Human Network / Arevalo, Chezka Camille P ; Pabico, Jaderick P
In the advent of the Internet, web-mediated social networking has become of great influence to Filipinos. Networking sites such as Friendster, YouTube, FaceBook and MySpace are among the most well known sites on the Internet. [...]
arXiv:1507.01082.- 2015 - 5 p. - Published in : vol (2009) External link: Preprint

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2015-07-07
07:57
Granular chains with soft boundaries: Slowing the transition to quasi-equilibrium / Przedborski, Michelle ; Harroun, Thad A ; Sen, Surajit
We present here a detailed numerical study of the dynamical behaviour of `soft' uncompressed grains in a granular chain where the grains interact via the intrinsically nonlinear Hertz force. It is well known that such a chain supports the formation of solitary waves (SWs). [...]
arXiv:1507.01021.- 2015 - Published in : Phys. Rev. E 91 (2015) 042207 External link: Preprint

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2015-07-07
07:55
Neutrino-antineutrino Mass Splitting in the Standard Model: Neutrino Oscillation and Baryogenesis / Fujikawa, Kazuo ; Tureanu, Anca
By adding a neutrino mass term to the Standard Model, which is Lorentz and $SU(2)\times U(1)$ invariant but non-local to evade $CPT$ theorem, it is shown that non-locality within a distance scale of the Planck length, that may not be fatal to unitarity in generic effective theory, can generate the neutrino-antineutrino mass splitting of the order of observed neutrino mass differences, which is tested in oscillation experiments, and non-negligible baryon asymmetry depending on the estimate of sphaleron dynamics. The one-loop order induced electron-positron mass splitting in the Standard Model is shown to be finite and estimated at $\sim 10^{-20}$ eV, well below the experimental bound $< 10^{-2}$ eV. [...]
arXiv:1507.01177.- 2015 - 10 p. - Published in : Mod. Phys. Lett. A 30 (2015) 1530016 External link: Preprint

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2015-07-07
07:55
Eikonal gluon radiation at finite-Nc beyond 2 loops / Khelifa-Kerfa, Kamel ; Delenda, Yazid
We present first calculations of QCD matrix-elements in perturbation theory at finite Nc beyond 2 loops in the eikonal approximation for e+ e- annihilation processes. For the emission of n soft energy-ordered gluons we solve both the colour and kinematic structures at a given order in perturbation theory by means of a Mathematica program that relies solely on a recently developed Mathematica code, ColorMath, that evaluates the trace of products of colour matrices. [...]
arXiv:1507.01132.- 2015 External link: Preprint

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2015-07-07
07:55
On the resummation of non-global logarithms at finite $\mathbf{N_c}$ / Delenda, Yazid ; Khelifa-Kerfa, Kamel
We present a calculation of non-global logs at finite $\mathrm{N_c}$ for the hemisphere mass distribution in $e^+e^-\to 2$ jets at single log accuracy up to fifth order in the strong coupling constant. Our results suggest a possible all-orders resummation of these large logs into an exponential. [...]
arXiv:1507.01130.- 2015 External link: Preprint

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