637 research outputs found
The structure of N(1535) in the aspect of chiral symmetry
The structure of N(1535) is discussed in dynamical and symmetry aspects based
on chiral symmetry. We find that the N(1535) in chiral unitary model has
implicitly some components other than meson-baryon one. We also discuss the
N(1535) in the chiral doublet picture.Comment: 4 pages, no figure, talk given at Workshop on Chiral Symmetry in
Hadron and Nuclear Physics: Chiral07, Osaka, Japan, 13-16 Nov 200
Hadronic aspects of exotic baryons
In this talk I look into three different topics, addressing first the
possibility that the is a bound state of , exploiting the
results of this study to find out the contribution of two meson and one baryon
components in the baryon antidecuplet and in the third place I present results
on a new resonant exotic baryonic state which appears as dynamically generated
by the Weinberg Tomozawa interaction.Comment: Talk at the International Workshop PENTAQUARK0
On the determination of quantum numbers and other topics of exotic baryons
In this talk I look into three different topics, addressing first a method to
determine the quantum numbers of the , then exploiting the
possibility that the is a bound state of and in the third
place I present results on a new resonant exotic baryonic state which appears
as dynamically generated by the Weinberg Tomozawa interaction.Comment: 9 pags. Talk in the NSTAR04 Workshop, Grenoble, march 200
On-line Response Tests on Case History of Earthquake Induced Deformation of River Dykes Founded on Saturated Sandy Deposits
River dykes and road embankments are frequently damaged during earthquakes. The liquefaction of foundation, the behavior of which is not yet well realized, is considered to be the main cause of the damage. Based on the results of past studies, the foundation of an embankment was divided into three zones to examine the failure modes. One-dimensional on-line earthquake tests, which were conducted by a combination of element tests and computer earthquake response analyses, were performed for such zones of actual river dykes damaged during earthquake. The cumulative horizontal displacement values obtained by the tests were compared with the measured embankment-crest settlement data, which showed that the liquefaction sliding failure under the toe of slope of such an embankment is found to be the most detrimental of all failure modes
Rings in the Solar System: a short review
Rings are ubiquitous around giant planets in our Solar System. They evolve
jointly with the nearby satellite system. They could form either during the
giant planet formation process or much later, as a result of large scale
dynamical instabilities either in the local satellite system, or at the
planetary scale. We review here the main characteristics of rings in our solar
system, and discuss their main evolution processes and possible origin. We also
discuss the recent discovery of rings around small bodies.Comment: Accepted for the Handbook of Exoplanet
Two-meson cloud contribution to the baryon antidecuplet binding
We study the two-meson virtual cloud contribution to the self-energy of the
SU(3) antidecuplet, to which the Theta+ pentaquark is assumed to belong. This
is motivated by the large branching ratio of the N(1710) decay into two pions
and one nucleon. We derive effective Lagrangians that describe the N(1710)
decay into N-pi-pi with two pions in s or p wave. We obtain increased binding
for all members of the antidecuplet and a contribution to the mass splitting
between states with different strangeness which is at least 20 % of the
empirical one. We also provide predictions for three-body decays of the
pentaquark antidecuplet.Comment: 13 pages, To appear in Phys. Rev.
Constraining the low-energy S=-2 meson-baryon interaction with two-particle correlations
The two-particle correlation technique applied to pairs in pp
collisions at LHC recently provided the most precise data on the strangeness
meson-baryon interaction. In this letter, we use for the first time
femtoscopic data to constrain the parameters of a low-energy effective QCD
Lagrangian. The tuned model delivers new insights on the molecular nature of
the and states. This procedure opens the possibility to
determine higher order corrections, directly constraining QCD effective models
particularly in the multi-strange and charm sectors
Dynamical coupled-channel study of K+ Lambda photoproduction
Results for the reaction gamma p --> K+ Lambda, studied within a constituent
quark model and a dynamical coupled-channel approach, are presented and
compared with recent data. Issues related to the search for missing baryon
resonances are briefly discussed and the role played by a third S_{11}
resonance is underlined.Comment: To appear in the proceedings of BARYONS 2004, Palaiseau, France,
25-29 Oct 200
Quantitative validation of optical flow based myocardial strain measures using sonomicrometry
Dynamic cardiac metrics, including myocardial strains and displacements, provide a quantitative approach to evaluate cardiac function. However, in current clinical diagnosis, largely 2D strain measures are used despite that cardiac motions are complex 3D volumes over time. Recent advances in 4D ultrasound enable the capability to capture such complex motion in a single image data set. In our previous work, a 4D optical flow based motion tracking algorithm was developed to extract full 4D dynamic cardiac metrics from such 4D ultrasound data. In order to quantitatively evaluate this tracking method, in-vivo coronary artery occlusion experiments at various locations were performed on three canine hearts. Each dog was screened with 4D ultrasound and sonomicrometry data was acquired during each occlusion study. The 4D ultrasound data from these experiments was then analyzed with the tracking method and estimated principal strain measures were directly compared to those recorded by sonomicrometry. Strong agreement was observed independently for the three canine hearts. This is the first validation study of optical flow based strain estimation for 4D ultrasound with a direct comparison with sonomicrometry using in-vivo data
Effects of pseudoscalar-baryon channels in the dynamically generated vector-baryon resonances
We study the interaction of vector mesons with the octet of stable baryons in
the framework of the local hidden gauge formalism using a coupled channels
unitary approach, including also the pseudoscalar-baryon channels which couple
to the same quantum numbers. We examine the scattering amplitudes and their
poles, which can be associated to known baryon resonances,
and determine the role of the pseudoscalar-baryon channels, changing the width
and eventually the mass of the resonances generated with only the basis of
vector-baryon states
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