11 research outputs found
Solar Neutrinos with Three Flavor Mixings
The recent 71Ga solar neutrino observation is combined with the 37Cl and
Kamiokande-II observations in an analysis for neutrino masses and mixings. The
allowed parameter region is found for matter enhanced mixings among all three
neutrino flavors. Distortions of the solar neutrino spectrum unique to three
flavors are possible and may be observed in continuing and next generation
experiments.Comment: August 1992 (Revised) PURD-TH-92-
Maximal Neutrino Mixing from an Attractive Infrared Fixed Point
In the Standard Model (and MSSM), renormalization effects on neutrino mixing
are generally very small and the attractive fixed points are at vanishing
neutrino mixing. However for multi-higgs extensions of the Standard Model,
renormalization effects on neutrino mixing can be large and nontrivial fixed
points are possible. Here we examine a simple two-higgs model. For two flavors,
maximal mixing is an attractive infrared fixed point. For three flavors, the
neutrino mass matrix evolves towards large off-diagonal elements at low
energies. The experimentally suggested bimaximal neutrino mixing pattern is one
possible attractive infrared fixed point.Comment: 16 page
Renormalization of the neutrino mass matrix
The renormalization group equations for the general 2 by 2, complex, neutrino
mass matrix are shown to have exact, analytic solutions. Simple formulas are
given for the physical mixing angle, complex phase and mass ratio in terms of
their initial values and the energy scales. We also establish a (complex)
renormalization invariant relating these parameters. The qualitative features
of the physical parameters' renormalization are clearly illustrated in vector
field plots. In both the SM and MSSM, maximal mixing is a saddle point.Comment: 16 pages, 5 figure
Meson Decay Constants from Isospin Mass Splittings in the Quark Model
Decay constants of and mesons are estimated within the framework of a
heavy-quark approach using measured isospin mass splittings in the , ,
and states to isolate the electromagnetic hyperfine interaction between
quarks. The values MeV and MeV are
obtained. Only experimental errors are given; possible theoretical ambiguities,
and suggestions for reducing them, are noted.Comment: 7 pages, LaTeX, EFI-92-3
Heavy-quarkonium decay into Z+Higgs boson as a scalar/pseudoscalar discriminant
The heavy-quarkonium decay <SUP>3</SUP>S<SUB>1</SUB>(QQ<SUP>−</SUP>)→Z+Higgs boson, a feasible process for Higgs-boson searches, is shown to be highly sensitive to the structure of the HQQ<SUP>−</SUP> vertex. A study of the angular distributions of the Z decay products can distinguish between the scalar or pseudoscalar form of this vertex and provide important information on the electroweak-symmetry-breaking mechanism
Growing a Chemical Garden at the AirâFluid Interface
Here we grow chemical gardens using
a novel, quasi two-dimensional,
experimental configuration. Buoyant calcium chloride solution is pumped
onto the surface of sodium silicate solution. The solutions react
to form a precipitation structure on the surface. Initially, an open
channel forms that grows in a spiral. This transitions to radially
spreading and branching fingers, which typically oscillate in transparency
as they grow. The depth of the radial spreading, and the fractal dimension
of the finger growth, are surprisingly robust, being insensitive to
the pumping rate. The curvature of the channel membrane and the depth
of the radially spreading solution can be explained in terms of the
solution densities and the interfacial tension across the semipermeable
membrane. These unusually beautiful structures provide new insights
into the dynamics of precipitation structures and may lead to new
technologies where structures are grown instead of assembled
One-Step Biosynthesis of α-Keto-γ-Methylthiobutyric Acid from L-Methionine by an Escherichia coli Whole-Cell Biocatalyst Expressing an Engineered L-Amino Acid Deaminase from Proteus vulgaris
Oekologische Baumaterialien Tagungsband
In dem vorliegenden Tagungsbericht sind die Referate abgedruckt die auf den Symposien ''Oekologische Baumaterialen'' gehalten wurden. Themenkomplex A: Baustoffe - Gewinnung und Herstellung; Themenkomplex B: Baustoffe - Handel und Kosten. Europaeische Oekoinstitute im Vergleich; Themenkomplex C: Baustoffe -Abbruch Recycling, Wiederverwertung. (HW)This conference report contains the papers which were read at the symposium ''Ecological building materials''. A: Winning and preparation; B: Trade and cost. Comparison of European ecological institutes; C: Building materials, recycling of demolition materials, recycling. (HW)Available from TIB Hannover: RO 4013(25) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
Global karst springs hydrograph dataset for research and management of the worldâs fastest-flowing groundwater
(IF 6.44; Q1)International audienceKarst aquifers provide drinking water for 10% of the worldâs population, support agriculture, groundwater-dependent activities, and ecosystems. These aquifers are characterised by complex groundwater-flow systems, hence, they are extremely vulnerable and protecting them requires an in-depth understanding of the systems. Poor data accessibility has limited advances in karst research and realistic representation of karst processes in large-scale hydrological studies. In this study, we present World Karst Spring hydrograph (WoKaS) database, a community-wide effort to improve data accessibility. WoKaS is the first global karst springs discharge database with over 400 spring observations collected from articles, hydrological databases and researchers. The datasetâs coverage compares to the global distribution of carbonate rocks with some bias towards the latitudes of more developed countries. WoKaS database will ensure easy access to a large-sample of good quality datasets suitable for a wide range of applications: comparative studies, trend analysis and model evaluation. This database will largely contribute to research advancement in karst hydrology, supports karst groundwater management, and promotes international and interdisciplinary collaborations