980 research outputs found
Can a 3+2 Oscillation Model Explain the NuTeV Electroweak Results?
The weak mixing angle result from NuTeV falls three standard deviations above
the value determined by global electroweak fits. It has been suggested that one
possible explanation for this result could be the oscillation of electron
neutrinos in the NuTeV beam to sterile neutrinos. This article examines several
cases of masses and mixings for 3+2 neutrino oscillation models which fit the
current oscillation data at 99% CL. We conclude that electron to sterile
neutrino oscillations can account for only up to a third of a standard
deviation between the NuTeV determination of the weak mixing angle and the
standard model.Comment: 3 pages, 2 figures, submitted to Brief Report
Vertex Intrinsic Fitness: How to Produce Arbitrary Scale-Free Networks
We study a recent model of random networks based on the presence of an
intrinsic character of the vertices called fitness. The vertices fitnesses are
drawn from a given probability distribution density. The edges between pair of
vertices are drawn according to a linking probability function depending on the
fitnesses of the two vertices involved. We study here different choices for the
probability distribution densities and the linking functions. We find that,
irrespective of the particular choices, the generation of scale-free networks
is straightforward. We then derive the general conditions under which
scale-free behavior appears. This model could then represent a possible
explanation for the ubiquity and robustness of such structures.Comment: 4 pages, 3 figures, RevTe
Neutrino-induced coherent pion production off nuclei reexamined
It is pointed out that so far all theoretical estimates of coherent pion
production off nuclei induced by neutrinos rely on the 'local approximation'
well known in photonuclear physics. The effects of dropping this approximation
are discussed. It is found that in a plane wave approximation for the pion the
local approximation overestimates the coherent neutrino-induced pion production
on nuclei.Comment: v3: comments on pion FSI added, minor corrections; version as
published in Phys. Rev.
Exploring multi-stability in semiconductor ring lasers: theory and experiment
We report the first experimental observation of multi-stable states in a
single-longitudinal mode semiconductor ring laser. We show how the operation of
the device can be steered to either monostable, bistable or multi-stable
dynamical regimes in a controlled way. We observe that the dynamical regimes
are organized in well reproducible sequences that match the bifurcation
diagrams of a two-dimensional model. By analyzing the phase space in this
model, we predict how the stochastic transitions between multi-stable states
take place and confirm it experimentally.Comment: 4 pages, 5 figure
PCV19 ONE-YEAR COSTS FORACUTE CORONARY SYNDROME IN PATIENTS WITH AND WITHOUT REVASCULARIZATION DURING THE INITIAL HOSPITALIZATION
A variable delay integrated receiver for differential phase-shift keying optical transmission systems
An integrated variable delay receiver for DPSK optical transmission systems is presented. The device is realized in silicon-on-insulator technology and can be used to detect DPSK signals at any bit-rates between 10 and 15 Gbit/s
Topological insight into the non-Arrhenius mode hopping of semiconductor ring lasers
We investigate both theoretically and experimentally the stochastic switching
between two counter-propagating lasing modes of a semiconductor ring laser.
Experimentally, the residence time distribution cannot be described by a simple
one parameter Arrhenius exponential law and reveals the presence of two
different mode-hop scenarios with distinct time scales. In order to elucidate
the origin of these two time scales, we propose a topological approach based on
a two-dimensional dynamical system.Comment: 4 pages, 3 figure
The Orbital Angular Momentum of Light for Ultra-High Capacity Data Centers
The potential of orbital angular momentum (OAM) of light in data center scenarios is presented. OAMs can be exploited for short reach ultra-high bit rate fiber links and as additional multiplexing domain in transparent ultra-high capacity optical switches. Recent advances on OAM integrated photonic technology are also reported. Finally demonstration of OAM-based fiber links (aggregate throughput 17.9 Tb/s) and two layers OAM-WDM-based optical switches are presented exploiting OAM integrated components and demonstrating the achievable benefits in terms of size, weight and power consumption (SWaP) compared to different technologies
Nuclear effects in neutrino-nucleus DIS
We explain the current status of nuclear parton distribution functions in
connection with neutrino-nucleus interactions. Neutrino deep inelastic
scattering (DIS) measurements have been done for heavy nuclear targets such as
iron and lead. In order to extract structure functions of the nucleon, one
needs to remove nuclear effects from the data. However, recent studies indicate
that there are inconsistencies in nuclear modifications between charged-lepton
and neutrino scattering measurements. Nuclear medium effects could be also an
origin for the NuTeV anomaly in the weak-mixing angle. In addition, the
modifications could affect neutrino-oscillation experiments because some DIS
events of neutrino-oxygen nucleus interactions are contained. On the other
hand, the nuclear medium effects themselves are interesting and important for
describing nuclei in terms of quark and gluon degrees of freedom.Comment: 8 pages, LaTeX, 9 eps files, to be published in AIP conference
proceeding
Shaping the spectral correlation of bi-photon quantum frequency combs by multi-frequency excitation of an SOI integrated nonlinear resonator
: We reveal the generation of a broadband (> 1.9 THz) bi-photon quantum frequency comb (QFC) in a silicon-on-insulator (SOI) Fabry-Pérot micro-cavity and the control of its spectral correlation properties. Correlated photon pairs are generated through three spontaneous four-wave mixing (SFWM) processes by using a co-polarized bi-chromatic coherent input with power P1 and P2 on adjacent resonances of the nonlinear cavity. Adjusting the spectral power ratio r = P1/(P1 + P2) allows control over the influence of each process leading to an enhancement of the overall photon pair generation rate (PGR) μ(r) by a maximal factor of μ(r = 0.5)/μ(r = 0) ≈ 1.5, compared to the overall PGR provided by a single-pump configuration with the same power budget. We demonstrate that the efficiency aND of the non-degenerate excitation SFWM process (NDP) doubles the efficiency a1 ≈ a2 of the degenerate excitation SFWM processes (DP), showing a good agreement with the provided model
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