981 research outputs found
Scaling analysis of FLIC fermion actions
The Fat Link Irrelevant Clover (FLIC) fermion action is a variant of the
-improved Wilson action where the irrelevant operators are constructed
using smeared links. While the use of such smearing allows for the use of
highly improved definitions of the field strength tensor we show
that the standard 1-loop clover term with a mean field improved coefficient
is sufficient to remove the errors, avoiding the need for
non-perturbative tuning. This result enables efficient dynamical simulations in
QCD with the FLIC fermion action.Comment: 5 pages, 3 figure
Impact of Public Policies on Women Health in India: An Empirical Study
An effort has been made in this study to measure the impact of public policies on women health in Indian. This Paper has been divided into three parts: first part of the study shows the trend and pattern of the public policies on women health from 2004 to 2015. Secondly, this paper explored the effectiveness of the health policies and in order to find out the effectiveness, we have used Anova with post hoc test. Lastly, we have used regression analysis to find out the impact of public policies on women health in India
Evolution of Fermion Pairing from Three to Two Dimensions
We follow the evolution of fermion pairing in the dimensional crossover from
3D to 2D as a strongly interacting Fermi gas of Li atoms becomes confined
to a stack of two-dimensional layers formed by a one-dimensional optical
lattice. Decreasing the dimensionality leads to the opening of a gap in
radio-frequency spectra, even on the BCS-side of a Feshbach resonance. The
measured binding energy of fermion pairs closely follows the theoretical
two-body binding energy and, in the 2D limit, the zero-temperature mean-field
BEC-BCS theory.Comment: 5 pages, 4 figure
Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
The coupling of the spin of electrons to their motional state lies at the
heart of recently discovered topological phases of matter. Here we create and
detect spin-orbit coupling in an atomic Fermi gas, a highly controllable form
of quantum degenerate matter. We reveal the spin-orbit gap via spin-injection
spectroscopy, which characterizes the energy-momentum dispersion and spin
composition of the quantum states. For energies within the spin-orbit gap, the
system acts as a spin diode. To fully inhibit transport, we open an additional
spin gap, thereby creating a spin-orbit coupled lattice whose spinful band
structure we probe. In the presence of s-wave interactions, such systems should
display induced p-wave pairing, topological superfluidity, and Majorana edge
states
Hamiltonian effective field theory study of the resonance in lattice QCD
We examine the phase shifts and inelasticities associated with the
Roper resonance and connect these infinite-volume observables to
the finite-volume spectrum of lattice QCD using Hamiltonian effective field
theory. We explore three hypotheses for the structure of the Roper resonance.
All three hypotheses are able to describe the scattering data well. In the
third hypothesis the Roper resonance couples the low-lying bare basis-state
component associated with the ground state nucleon with the virtual
meson-baryon contributions. Here the non-trivial superpositions of the
meson-baryon scattering states are complemented by bare basis-state components
explaining their observation in contemporary lattice QCD calculations. The
merit of this scenario lies in its ability to not only describe the observed
nucleon energy levels in large-volume lattice QCD simulations but also explain
why other low-lying states have been missed in today's lattice QCD results for
the nucleon spectrum.Comment: 14 pages, 14 figures; version to be published in Phys. Rev.
Hamiltonian effective field theory study of the resonance in lattice QCD
Drawing on experimental data for baryon resonances, Hamiltonian effective
field theory (HEFT) is used to predict the positions of the finite-volume
energy levels to be observed in lattice QCD simulations of the lowest-lying
nucleon excitation. In the initial analysis, the phenomenological
parameters of the Hamiltonian model are constrained by experiment and the
finite-volume eigenstate energies are a prediction of the model. The agreement
between HEFT predictions and lattice QCD results obtained on volumes with
spatial lengths of 2 and 3 fm is excellent. These lattice results also admit a
more conventional analysis where the low-energy coefficients are constrained by
lattice QCD results, enabling a determination of resonance properties from
lattice QCD itself. Finally, the role and importance of various components of
the Hamiltonian model are examined.Comment: 5 pages, 2 figures; version published in Phys. Rev. Let
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