119,630 research outputs found
Neutrino Factory Superbeam
We discuss the optimization of a neutrino factory for large \sin^2 2
\theta_{13}, where we assume minimum effort on the accelerator side. This
implies that we use low muon energies for the price of an optimized detection
system. We demonstrate that such a neutrino factory performs excellent if
combined with the electron neutrino appearance channel. Instead of the platinum
channel operated with the muon neutrinos from the muon decays, we propose to
use the initial superbeam from the decaying pions and kaons, which might be
utilized at little extra effort. Since we assume out-of-phase bunches arriving
at the same detector, we do not require electron charge identification. In
addition, we can choose the proton energy such that we obtain a synergistic
spectrum peaking at lower energies. We find that both the superbeam and the
neutrino factory beam should used at the identical baseline to reduce matter
density uncertainties, possibly with the same detector. This effectively makes
the configuration a single experiment, which we call ``neutrino factory
superbeam''. We demonstrate that this experiment outperforms a low-energy
neutrino factory or a wide band beam alone beyond a simple addition of
statistics.Comment: 7 pages, 5 figures, 1 tabl
Neutrino oscillation physics with a FNAL proton driver
We discuss the need of a proton driver for the Fermilab neutrino oscillation
program, as well as its role in the global context.Comment: 3 pages, 1 figure; Talk given at the NuFact 05 workshop, June 21-26,
Frascati, Ital
Seesaw Mechanism in Warped Geometry
We show how the seesaw mechanism for neutrino masses can be realized within a
five dimensional (5D) warped geometry framework. Intermediate scale standard
model (SM) singlet neutrino masses, needed to explain the atmospheric and solar
neutrino oscillations, are shown to be proportional to M_Pl\exp((2c-1)\pi kR),
where c denotes the coefficient of the 5D Dirac mass term for the singlet
neutrino which also has a Planck scale Majorana mass localized on the
Planck-brane, and kR~11 in order to resolve the gauge hierarchy problem. The
case with a bulk 5D Majorana mass term for the singlet neutrino is briefly
discussed.Comment: 14 pages, LaTeX, 4 figures, references adde
Approximation algorithms for the normalizing constant of Gibbs distributions
Consider a family of distributions where
means that . Here is the
proper normalizing constant, equal to . Then
is known as a Gibbs distribution, and is the
partition function. This work presents a new method for approximating the
partition function to a specified level of relative accuracy using only a
number of samples, that is, when
. This is a sharp improvement over previous, similar approaches that
used a much more complicated algorithm, requiring
samples.Comment: Published in at http://dx.doi.org/10.1214/14-AAP1015 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Parameters for apple quality and an outline for a new concept of quality
This report was presented at the UK Organic Research 2002 Conference. The commonly used concept of quality in relation to food, with its emphasis on external appearance and nutritional content is not sufficient for organic products and their market. In response a quality concept known as ‘vital quality’ has been developed based on the life processes (growth and differentiation) and corresponding product attributes (vitality, structure and coherence). The research project presented is based on the evaluation of the quality of apples, specifically cultivated for the research project with variation in picking date, bearing, sun exposure, bio-dynamic preparations and ageing after storage. Quality measurements included traditional methods used routinely to assess apple quality and also experimental parameters which are expected to be relevant for vital quality. The experimental parameters appeared to supplement the traditional parameters in a consideration of quality. The concept of ‘vital quality’ is a valuable one for the consideration of wider aspects of quality within organic farming systems and should be further develope
Constructing Optimal Authentication Codes with Perfect Multi-fold Secrecy
We establish a construction of optimal authentication codes achieving perfect
multi-fold secrecy by means of combinatorial designs. This continues the
author's work (ISIT 2009) and answers an open question posed therein. As an
application, we present the first infinite class of optimal codes that provide
two-fold security against spoofing attacks and at the same time perfect two-
fold secrecy.Comment: 4 pages (double-column); to appear in Proc. 2010 International Zurich
Seminar on Communications (IZS 2010, Zurich
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