670 research outputs found
Open charm meson in nuclear matter at finite temperature beyond the zero range approximation
The properties of open charm mesons, , , and in
nuclear matter at finite temperature are studied within a self-consistent
coupled-channel approach. The interaction of the low lying pseudoscalar mesons
with the ground state baryons in the charm sector is derived from a -channel
vector-exchange model. The in-medium scattering amplitudes are obtained by
solving the Lippmann-Schwinger equation at finite temperature including Pauli
blocking effects, as well as , , and self-energies
taking their mutual influence into account. We find that the in-medium
properties of the meson are affected by the -meson self-energy through
the intermediate loops coupled to states. Similarly, dressing the
meson in the loops has an influence over the properties of
the meson.Comment: 23 pages, 9 figures, 2 table
Dynamically generated open charmed baryons beyond the zero range approximation
The interaction of the low lying pseudo-scalar mesons with the ground state
baryons in the charm sector is studied within a coupled channel approach using
a t-channel vector-exchange driving force. The amplitudes describing the
scattering of the pseudo-scalar mesons off the ground-state baryons are
obtained by solving the Lippmann--Schwinger equation. We analyze in detail the
effects of going beyond the approximation. Our model predicts the
dynamical generation of several open charmed baryon resonances in different
isospin and strangeness channels, some of which can be clearly identified with
recently observed states.Comment: 7 figures, 8 table
Charmed nuclei within a microscopic many-body approach
Single-particle energies of the chamed baryon are obtained in
several nuclei from the relevant self-energy constructed within the framework
of a perturbative many-body approach. Results are presented for a charmed
baryon-nucleon () potential based on a SU(4) extension of the
meson-exchange hyperon-nucleon potential of the J\"{u}lich group.
Three different models (A, B and C) of this interaction, that differ only on
the values of the couplings of the scalar meson with the charmed
baryons, are considered. Phase shifts, scattering lengths and effective ranges
are computed for the three models and compared with those predicted by the
interaction derived in Eur. Phys. A {\bf 54}, 199 (2018) from the
extrapolation to the physical pion mass of recent results of the HAL QCD
Collaboration. Qualitative agreement is found for two of the models (B and C)
considered. Our results for -nuclei are compatible with those
obtained by other authors based on different models and methods. We find a
small spin-orbit splitting of the and wave states as in the case
of single -hypernuclei. The level spacing of
single-particle energies is found to be smaller than that of the corresponding
one for hypernuclei. The role of the Coulomb potential and the effect of the
coupling of the and channels on the single-particle
properties of nuclei are also analyzed. Our results show that,
despite the Coulomb repulsion between the and the protons, even the
less attractive one of our models (model C) is able to bind the
in all the nuclei considered. The effect of the
coupling is found to be almost negligible due to the
large mass difference of the and baryons.Comment: 10 pages, 6 figures, 4 table
Generalized transverse resonance analysis of planar discontinuities considering the edge effect
Mode-matching related techniques such as the Generalized Transverse Resonance Method (GTR) suffer from the relative convergence phenomenon. To reduce its influence, we present a technique consisting of the application of basis functions incorporating the singular behavior of fields at edges and an optimal modal ratio. We present the results obtained analyzing a uniform finline and a short-circuited finline which demonstrate the minimization of the relative convergence phenomenon, allowing a fast and accurate analysis on a low-cost personal computer.Peer Reviewe
La coxartrosis en los pacientes con osteopetrosis: su tratamiento quirúrgico
Se presentan un caso de osteopetrosis en un paciente de 22 años de edad que consultó por dolor en
la cadera izquierda, siendo diagnosticado de coxartrosis izquierda secundaria a la osteopetrosis. Fue tratado inicialmente
de forma quirúrgica realizándosele una osteotomía de la cadera afectada. Varios años después, tras la reaparición
del dolor se procedió a la implantación de una prótesis total de cadera que evolucionó satisfactoriamente.A case of osteopetrosis in a 22-year-old patient who consulted by pain in the left hip is presented. He
was diagnosed of degenerative osteoarthritis of the left hip secondary to osteopetrosis. Initially, it was treated surgically
by an osteotomy of the proximal femur. Several years later\ after the pain reappearance, the authors treated the
patient by a total hip arthroplasty with satisfactory outcome
Atmospheric dispersion of airborne pollen evidenced by near-surface and columnar measurements in Barcelona, Spain
Hourly measurements of pollen near-surface concentration and lidar-derived profiles of particle backscatter coefficients and of volume and particle depolarization ratios during a 5-day pollination event observed in Barcelona, Spain, between 27 – 31 March, 2015, are presented. Maximum hourly pollen concentrations of 4700 and 1200 m-3 h-1 were found for Platanus and Pinus, respectively, which represented together more than 80 % of the total pollen. Everyday a clear diurnal cycle caused by the vertical transport of the airborne pollen was visible on the lidar-derived profiles of the backscatter coefficient with maxima usually reached between 12 and 15 UT. A method based on the lidar polarization capabilities was used to retrieve the contribution of the pollen to the total signal. On average the diurnal (9 – 17 UT) pollen aerosol optical depth (AOD) was 0.05 which represented 29 % of the total AOD, the volume and particle depolarization ratios in the pollen plume were 0.08 and 0.14, respectively, and the diurnal mean of the height of the pollen plume was found at 1.24 km.
The dispersion of the Platanus and Pinus in the atmosphere was simulated with the Nonhydrostatic Multiscale Meteorological Model on the B grid at the Barcelona Supercomputing Center with a newly developed Chemical Transport Model (NMMB/BSC-CTM). Model near-surface daily concentrations were compared to our observations at two sites: in Barcelona and Bellaterra (12 km NE of Barcelona). Model hourly concentrations were compared to our observations in Barcelona.Peer ReviewedPostprint (author's final draft
- …