258 research outputs found
Impact of the Berlin Accord and European Enlargement on Dairy Markets, The
Using a world agricultural model, we analyze the impact on dairy markets of the Berlin Accord on the European Union (EU) Common Agricultural Policy (CAP) Reforms. We also investigate the consequences of enlargement of the EU to include the Czech Republic, Hungary and Poland for the same markets. We produce a market outlook up to 2010 for these two scenarios. The Berlin Accord induces lower EU milk and dairy prices. A change in relative prices between cheese and butter-skim milk powder (SMP) occurs after 2005 and induces an expansion of cheese production, consumption and exports at the expense of the butterï¾–SMP sector. Accession of the three central and eastern European countries (CEECs) leads to a permanent but moderate decrease in EU prices of milk and dairy products. For the three acceding CEECs, domestic prices increase dramatically. Their final consumption of milk decreases and dairy product consumption drops considerably. The derived demand of milk in dairy production increases, however, because of the higher prices for dairy products, benefiting dairy producers in these CEECs. Dairy exports of the three acceding countries to the EUï¾–15 increase by one to three orders of magnitude, despite building large inventories. The impact of accession on world markets is small.
Charged Randall-Sundrum black holes and N=4 super Yang-Mills in AdS(2)xS(2)
We obtain some exact results for black holes in the Randall-Sundrum model
with a single brane. We consider an extreme black hole charged with respect to
a Maxwell field on the brane. The near-horizon geometry is determined. The
induced metric on the brane and the black hole entropy are compared with the
predictions of 4d General Relativity. There is good agreement for large black
holes, with calculable subleading corrections. As a separate application, the
bulk solution provides a gravitational dual for (strongly coupled, large N) N=4
SYM in AdS(2)xS(2) for arbitrary relative size of AdS(2) and S(2).Comment: 13 page
The breaking of the flavour permutational symmetry: Mass textures and the CKM matrix
Different ansaetze for the breaking of the flavour permutational symmetry
according to S(3)L X S(3)R in S(2)L X S(2) give different Hermitian mass
matrices of the same modified Fritzsch type, which differ in the symmetry
breaking pattern. In this work we obtain a clear and precise indication on the
preferred symmetry breaking scheme from a fit of the predicted theoretical Vckm
to the experimentally determined absolute values of the elements of the CKM
matrix. The preferred scheme leads to simple mass textures and allows us to
compute the CKM mixing matrix, the Jarlskog invariant J, and the three inner
angles of the unitarity triangle in terms of four quark mass ratios and only
one free parameter: the CP violating phase Phi. Excellent agreement with the
experimentally determined absolute values of the entries in the CKM matrix is
obtained for Phi = 90 deg. The corresponding computed values of the Jarlskog
invariant and the inner angles are J = 3.00 X 10^-5, alpha= 84 deg, beta= 24
deg and gamma =72 deg in very good agreement with current data on CP violation
in the neutral kaon-antikaon system and oscillations in the B-Bbar system.Comment: 21 pages, 1 fig. Content enlarged, references added and typos
corrected. To be published in Phys Rev
Embedding Phenomenological Quark-Lepton Mass Matrices into SU(5) Gauge Models
We construct phenomenological quark-lepton mass matrices based on S
permutation symmetry in a manner fully compatible with SU(5) grand unification.
The Higgs particles we need are {\bf 5}, {\bf 45} and their conjugates. The
model gives a charge 1/3 quark vs charged lepton mass relation, and also a
good fit to mass-mixing relations for the quark sector, as well as an
attractive mixing pattern for the lepton sector, explaining a large mixing
angle between and , and either large or small
mixing angle, depending on the choice of couplings, consistent
with the currently accepted solutions to the solar neutrino problem.Comment: 12 pages, LaTex file, no figure
On dynamics of fermion generations
The hierarchy of fermion masses and EW symmetry breaking without elementary
Higgs is studied on the basis of strong gauge field distributions governing the
EW dynamics. The mechanism of symmetry breaking due to quark bilinears
condensation is generalized to the case, when higher field correlators are
present in the EW vacuum. Resulting wave functional yields several minima of
quark bilinears, giving masses of three (or more) generations. Mixing is
suggested to be due to kink solutions of the same wave functional. For a
special form of this mixing ("coherent mixing") a realistic hierarhy of masses
and of CKM coefficients is obtained and arguments in favor of the fourth
generation are given. Possible important role of topological charges for CP
violating phases and small masses of the first generation is stressed.Comment: 31 pages, typos corrected, references adde
Test of the Dimopouos-Hall-Raby Ansatz for Fermion Mass Matrices
By evolution of fermion mass matrices of the Fritzsch and the Georgi-Jarlskog
forms from the supersymmetric grand unified scale, DHR obtained predictions for
the quark masses and mixings. Using Monte Carlo methods we test these
predictions against the latest determinations of the mixings, the CP-violating
parameter epsilon_K and the B_d^0--Bbar_d^0 mixing parameter r_d. The
acceptable solutions closely specify the quark masses and mixings, but lie at
the edges of allowed regions at 90% confidence level.Comment: 11 pages, 1 figure (not included
Electrochemical two-step delithiation/Re-lithiation of LiCoPO₄ observed by in situ XRD, in situ XAS, and ex situ ⁷Li/³¹P NMR spectroscopy
On the statistics of resonances and non-orthogonal eigenfunctions in a model for single-channel chaotic scattering
We describe analytical and numerical results on the statistical properties of
complex eigenvalues and the corresponding non-orthogonal eigenvectors for
non-Hermitian random matrices modeling one-channel quantum-chaotic scattering
in systems with broken time-reversal invariance.Comment: 4 pages, 2 figure
Electrochemical delithiation/relithiation of LiCoPO₄: A two-step reaction mechanism investigated by in situ XRD, in situ XAS, and ex situ ⁷Li/³¹P NMR spectroscopy
Model of the Quark Mixing Matrix
The structure of the Cabibbo-Kobayashi-Maskawa (CKM) matrix is analyzed from
the standpoint of a composite model. A model is constructed with three families
of quarks, by taking tensor products of sufficient numbers of spin-1/2
representations and imagining the dominant terms in the mass matrix to arise
from spin-spin interactions. Generic results then obtained include the familiar
relation , and a less frequently
seen relation . The magnitudes of
and come out naturally to be of the right order. The phase in
the CKM matrix can be put in by hand, but its origin remains obscure.Comment: Presented by Mihir P. Worah at DPF 92 Meeting, Fermilab, November,
1992. 3 pages, LaTeX fil
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