162,032 research outputs found
Nonleptonic Weak Decays of B to D_s and D mesons
Branching ratios and polarization amplitudes for B decaying to all allowed
pseudoscalar, vector, axial-vector, scalar and tensor combinations of D_s and D
mesons are calculated in the Isgur Scora Grinstein Wise (ISGW) quark model
after assuming factorization. We find good agreement with other models in the
literature and the limited experimental data and make predictions for as yet
unseen decay modes. Lattice QCD results in this area are very limited. We make
phenomenological observations on decays in to D_s(2317) and D_s(2460) and
propose tests for determining the status and mixings of the axial mesons. We
use the same approach to calculate branching ratios and polarization fraction
for decays in to two D type mesons.Comment: 21 pages, 9 figures. v3: updated to reflect changes in published
paper, conclusions unchanged (see source file for details). Added comments on
factorization. v2: experimental data updated, references added, tables of
results added, more on axial D_s mixing, added section on D D decay modes and
typos correcte
A look at profiler performance
Since about 1974, Doppler radars operating in UHF and VHF ranges have been used increasingly to study atmospheric winds. Historically, large systems capable of obtaining data from high altitudes have focused attention on the mesosphere and stratosphere, rather than on the troposphere wherein abides most of the weather considered by most meteorologists. Research address some questions the meteorologist must logically ask first, viz., what is the actual performance capability of these systems, how accurate is the wind data of interest to meteorologists, and from what altitudes in the troposphere are the data reliably obtained
Comparison of Leafhopper Species Complexes in the Ground Cover of Sprayed and Unsprayed Peach Orchards in Michigan (Homoptera: Cicadellldae)
Two Michigan peach orchards were sampled for leafhoppers using a fixed-area ground sampling device attached to a D-vac®. Absolute abundance estimates indicated that routine tree insecticide applications greatly depressed leafhopper populations. This, and the fact that no resident, known vectors of the X-disease pathogen were detected, suggests that increasing insecticide applications to check the spread of the disease through vector control would be ineffective
Spin-Projected Generalized Hartree-Fock as a Polynomial of Particle-Hole Excitations
The past several years have seen renewed interest in the use of
symmetry-projected Hartree-Fock for the description of strong correlations.
Unfortunately, these symmetry-projected mean-field methods do not adequately
account for dynamic correlation. Presumably, this shortcoming could be
addressed if one could combine symmetry-projected Hartree-Fock with a many-body
method such as coupled cluster theory, but this is by no means straightforward
because the two techniques are formulated in very different ways. However, we
have recently shown that the singlet -projected unrestricted Hartree-Fock
wave function can in fact be written in a coupled cluster-like wave function:
that is, the spin-projected unrestricted Hartree-Fock wave function can be
written as a polynomial of a double-excitation operator acting on some
closed-shell reference determinant. Here, we extend this result and show that
the spin-projected generalized Hartree-Fock wave function (which has both
and projection) is likewise a polynomial of low-order excitation
operators acting on a closed-shell determinant, and provide a closed-form
expression for the resulting polynomial coefficients. We include a few
preliminary applications of the combination of this spin-projected Hartree-Fock
and coupled cluster theory to the Hubbard Hamiltonian, and comment on
generalizations of the methodology. Results here are not for production level,
but a similarity transformed theory that combines the two offers the promise of
being accurate for both weak and strong correlation, and particularly may offer
significant improvements in the intermediate correlation regime where neither
projected Hartree-Fock nor coupled cluster is particularly accurate.Comment: accepted by Phys. Rev.
Finitely dependent coloring
We prove that proper coloring distinguishes between block-factors and
finitely dependent stationary processes. A stochastic process is finitely
dependent if variables at sufficiently well-separated locations are
independent; it is a block-factor if it can be expressed as an equivariant
finite-range function of independent variables. The problem of finding
non-block-factor finitely dependent processes dates back to 1965. The first
published example appeared in 1993, and we provide arguably the first natural
examples. More precisely, Schramm proved in 2008 that no stationary 1-dependent
3-coloring of the integers exists, and conjectured that no stationary
k-dependent q-coloring exists for any k and q. We disprove this by constructing
a 1-dependent 4-coloring and a 2-dependent 3-coloring, thus resolving the
question for all k and q.
Our construction is canonical and natural, yet very different from all
previous schemes. In its pure form it yields precisely the two finitely
dependent colorings mentioned above, and no others. The processes provide
unexpected connections between extremal cases of the Lovasz local lemma and
descent and peak sets of random permutations. Neither coloring can be expressed
as a block-factor, nor as a function of a finite-state Markov chain; indeed, no
stationary finitely dependent coloring can be so expressed. We deduce
extensions involving d dimensions and shifts of finite type; in fact, any
non-degenerate shift of finite type also distinguishes between block-factors
and finitely dependent processes
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