453 research outputs found
Precision Neutrino Oscillation Physics with an Intermediate Baseline Reactor Neutrino Experiment
We discuss the physics potential of intermediate km
baseline experiments at reactor facilities, assuming that the solar neutrino
oscillation parameters and lie in the
high-LMA solution region. We show that such an intermediate baseline reactor
experiment can determine both and with a
remarkably high precision. We perform also a detailed study of the sensitivity
of the indicated experiment to , which drives the
dominant atmospheric () oscillations, and to
- the neutrino mixing angle limited by the data from the CHOOZ and
Palo Verde experiments. We find that this experiment can improve the bounds on
. If the value of is large enough, \sin^2\theta
\gtap 0.02, the energy resolution of the detector is sufficiently good and if
the statistics is relatively high, it can determine with extremely high
precision the value of . We also explore the potential of
the intermediate baseline reactor neutrino experiment for determining the type
of the neutrino mass spectrum, which can be with normal or inverted hierarchy.
We show that the conditions under which the type of neutrino mass hierarchy can
be determined are quite challenging, but are within the reach of the experiment
under discussion.Comment: 25 page
Cosmological Constant, Gauge Hierarchy and Warped Geometry
It is suggested that the mechanism responsible for the resolution of the
gauge hierarchy problem within the warped geometry framework can be generalized
to provide a new explanation of the extremely tiny vacuum energy density rho_V
suggested by recent observations. We illustrate the mechanism with some 5D
examples in which the true vacuum energy is assumed to vanish, and rho_V is
associated with a false vacuum energy such that rho_V^{1/4} ~ TeV^2/M_{Pl} ~
10^{-3} eV, where M_{Pl} denotes the reduced Planck mass. We also consider a
quintessence-like solution to the dark energy problem.Comment: 10 pages, LaTeX, 2 figures, section on quantum corrections added,
version to appear in Phys. Rev.
Новые клинические и диагностические стратегии при раке почки
Представлен анализ изменившейся клиники опухолей почки. Описаны динамика и последовательность использования новых визуализирующих методов диагностики.The analysis of the changed clinical picture of renal tumors is done. The dynamics and sequence of the new imaging techniques are described
Study of High-Spin States and Three-Quasiparticle (p,π) Transitions on Light Targets
This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440
Isospin Response of the 4-He Continuum
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
Theoretical analysis of neutron scattering results for quasi-two dimensional ferromagnets
A theoretical study has been carried out to analyse the available results
from the inelastic neutron scattering experiment performed on a quasi-two
dimensional spin-1/2 ferromagnetic material . Our formalism is based
on a conventional semi-classical like treatment involving a model of an ideal
gas of vortices/anti-vortices corresponding to an anisotropic XY Heisenberg
ferromagnet on a square lattice. The results for dynamical structure functions
for our model corresponding to spin-1/2, show occurrence of negative values in
a large range of energy transfer even encompassing the experimental range, when
convoluted with a realistic spectral window function. This result indicates
failure of the conventional theoretical framework to be applicable to the
experimental situation corresponding to low spin systems. A full quantum
formalism seems essential for treating such systems.Comment: 16 pages, 6 figures, 1 Table Submitted for publicatio
Spontaneous CP Violation in Non-Minimal Supersymmetric Models
We study the possibilities of spontaneous CP violation in the Next-to-Minimal
Supersymmetric Standard Model with an extra singlet tadpole term in the scalar
potential. We calculate the Higgs boson masses and couplings with radiative
corrections including dominant two loop terms. We show that it is possible to
satisfy the LEP constraints on the Higgs boson spectrum with non-trivial
spontaneous CP violating phases. We also show that these phases could account
for the observed value of epsilonK.Comment: 21 pages, 7 Figures in Encapsulated Postscrip
Extrinsic CPT Violation in Neutrino Oscillations in Matter
We investigate matter-induced (or extrinsic) CPT violation effects in
neutrino oscillations in matter. Especially, we present approximate analytical
formulas for the CPT-violating probability differences for three flavor
neutrino oscillations in matter with an arbitrary matter density profile. Note
that we assume that the CPT invariance theorem holds, which means that the CPT
violation effects arise entirely because of the presence of matter. As special
cases of matter density profiles, we consider constant and step-function matter
density profiles, which are relevant for neutrino oscillation physics in
accelerator and reactor long baseline experiments as well as neutrino
factories. Finally, the implications of extrinsic CPT violation on neutrino
oscillations in matter for several past, present, and future long baseline
experiments are estimated.Comment: 47 pages, 7 figures, RevTeX4. Final version to be published in Phys.
Rev.
Deviation of Atmospheric Mixing from Maximal and Structure in the Leptonic Flavor Sector
I attempt to quantify how far from maximal one should expect the atmospheric
mixing angle to be given a neutrino mass-matrix that leads, at zeroth order, to
a nu_3 mass-eigenstate that is 0% nu_e, 50% nu_mu, and 50% nu_tau. This is done
by assuming that the solar mass-squared difference is induced by an
"anarchical" first order perturbation, an approach than can naturally lead to
experimentally allowed values for all oscillation parameters. In particular,
both |cos 2theta_atm| (the measure for the deviation of atmospheric mixing from
maximal) and |U_e3| are of order sqrt(Delta m^2_sol/Delta m^2_atm) in the case
of a normal neutrino mass-hierarchy, or of order Delta m^2_sol/Delta m^2_atm in
the case of an inverted one. Hence, if any of the textures analyzed here has
anything to do with reality, next-generation neutrino experiments can see a
nonzero cos 2theta_atm in the case of a normal mass-hierarchy, while in the
case of an inverted mass-hierarchy only neutrino factories should be able to
see a deviation of sin^2 2theta_atm from 1.Comment: 12 pages, no figures, references and acknowledgments adde
ICZM and WTP of stakeholders for beach conservation: Policymaking suggestions from an Italian case study
In accordance with integrated coastal zone management (ICZM), private stakeholders could be asked to pay for the benefits from beach conservation projects. Since a private contribution is measured by the amount of other goods a person is willing to give up for beach quality, it can be solicited in monetary terms or, when possible, in other forms, such as specific works. In this paper, by analysing the results of two surveys in Italy concerning stakeholders' perceptions of ICZM and their willingness to pay for these benefits, suggestions for beach management are provided to policymakers. One survey focuses on beach visitors who are asked to pay in monetary terms, while the other focuses on sunbathing establishment managers, who are asked to pay not only in monetary terms but also through beach works. The results show that the majority of these stakeholders are fully or partially aware of what ICZM is, and are unwilling to pay. However, regression analysis of those willing to pay suggests that promoting an information and education campaign about ICZM may be important if stakeholders' probability of paying is to be increased
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