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Sep 23, 2013
09/13

by
H. Garcilazo; A. Valcarce

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We have solved for the first time the Faddeev equations for the bound state problem of the coupled $\Lambda\Lambda N$--$\Xi NN$ system to study whether an hypertriton with strangeness -2 may exist or not. We make use of the interactions obtained from a chiral quark model describing the low-energy observables of the two-baryon systems with strangeness 0, -1, and -2 and three-baryon systems with strangeness 0 and -1. The $\Lambda\Lambda N$ system alone is unbound. However, when the full coupling...

Source: http://arxiv.org/abs/1212.1369v1

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Jun 29, 2018
06/18

by
H. Garcilazo; A. Valcarce

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The recent update of the strangeness $-2$ ESC08c Nijmegen potential incorporating the NAGARA and KISO events predicts a $\Xi N$ bound state, $D^*$, in the $^3S_1 (I=1)$ channel. We study if the existence of this two-body bound state could give rise to stable three-body systems. For this purpose we solve the bound state problem of three-body systems where the $\Xi N$ state is merged with $N$'s, $\Lambda$'s, $\Sigma's$ or $\Xi$'s, making use of the most recent updates of the two-body ESC08c...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1606.08767

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Sep 22, 2013
09/13

by
H. Garcilazo; A. Valcarce

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The non-strange baryon spectrum is studied within a three-body model that incorporates relativistic kinematics. We found that the combined effect of relativistic kinematics together with the pion exchange between quarks is able to reverse the order of the first positive- and negative-parity nucleon excited states as observed experimentally. Including the chiral partner of the pion (the $\sigma$ meson) leads to an overall good description of the spectrum.

Source: http://arxiv.org/abs/hep-ph/0308023v1

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Jun 28, 2018
06/18

by
H. Garcilazo; A. Valcarce

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Arguments in favor of a light $\Xi NN$ hypernucleus with $(I)J^P=(3/2)1/2^+$ are presented, within the uncertainties of our knowledge of the baryon-baryon strangeness $-2$ interactions. If bound, this $\Xi NN$ state, being decoupled from the lowest $N\Lambda\Lambda$ system, would be stable. It will also benefit from additional binding due to the electromagnetic interaction what makes it worthwhile to look for. We show how the equivalent state with $J=3/2$ could never be bound in spite of the...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1507.03733

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Jun 29, 2018
06/18

by
H. Garcilazo; A. Valcarce

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We have used realistic local interactions based on the recent update of the strangeness $-2$ Nijmegen ESC08c potential to calculate the bound state problem of the $\Xi NN$ system in the $(I)J^P=(\frac{1}{2})\frac{3}{2}^+$ state. We found that this system presents a deeply bound state lying $13.5$ MeV below the $\Xi d$ threshold. Since in lowest order, pure S$-$wave configuration, this system can not decay into the open $\Lambda\Lambda N$ channel, its decay width is expected to be very small. We...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1605.04108

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Sep 17, 2013
09/13

by
H. Garcilazo; A. Valcarce

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We calculate the doublet and quartet neutron-deuteron scattering lengths using a nonlocal nucleon-nucleon interaction fully derived from quark-quark interactions. We use as input the $NN$ $^1S_0$ and $^3S_1$-${}^3 D_1$ partial waves. Our result for the quartet scattering length agrees well with the experimental value while the result for the doublet scattering length does not. However, if we take the result for the doublet scattering length together with the one for the triton binding energy...

Source: http://arxiv.org/abs/0711.3123v1

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Jul 20, 2013
07/13

by
H. Garcilazo; A. Valcarce

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In this Reply we argue that the conclusions derived in Ref. arXiv:1301.1241 are questionable.

Source: http://arxiv.org/abs/1304.3552v1

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Jun 28, 2018
06/18

by
H. Garcilazo; A. Valcarce

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It has been recently suggested the existence of a neutral bound state of two neutrons and a $\Lambda$ hyperon, $^3_\Lambda n$. We point out that using either simple separable potentials or a full-fledged calculation with realistic baryon-baryon interactions derived from the constituent quark cluster model there is no possibility for the existence of such a $\Lambda nn$ bound state. For this purpose, we performed a full Faddeev calculation of the $\Lambda nn$ system in the $(I,J^P)=(1,1/2^+)$...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1507.08061

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Sep 18, 2013
09/13

by
H. Garcilazo; M. T. Pena

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We have studied the reaction eta d -> eta d close to threshold within a nonrelativistic three-body formalism. We considered several eta N and NN models, in particular potentials with separable form, fitted to the low-energy eta N and NN data to represent the two-body interactions. We found that with realistic two-body interactions a quasibound state does not exist in this system, although there is an enhancement of the cross section by one order of magnitude, in the region near threshold,...

Source: http://arxiv.org/abs/nucl-th/0002056v1

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Jul 20, 2013
07/13

by
H. Garcilazo M. T. Pena

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Relativistic effects in a three-body calculation of the $np\to\eta d$ process are considered. Relativistic effects on the range and strength of the pion exchange contribution to the reaction mechanism may be large, but boost effects of the two-body interactions are negligible. The relativistic calculation confirms previous non-relativistic results, showing that the shape of the cross section near threshold is essentially determined by the $\eta d$ final-state interaction alone. As for the...

Source: http://arxiv.org/abs/nucl-th/0406070v1

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Sep 19, 2013
09/13

by
H. Garcilazo; M. T. Peña

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We have solved the Faddeev equations for $\eta d$ elastic scattering using realistic separable interactions for the $NN$ and coupled $\eta N$-$\pi N$ subsystems. We found that including explicitly the pion channel in the integral equations drastically reduces the attraction that is present in the system. As a consequence, the existence of a $\eta NN$ quasibound state is excluded by the modern $\eta N$ amplitude analysis.

Source: http://arxiv.org/abs/nucl-th/0010081v1

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Sep 19, 2013
09/13

by
H. Garcilazo; J. Vijande; A. Valcarce

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We investigate the structure of heavy baryons containing a charm or a bottom quark. We employ a constituent quark model successful in the description of the baryon-baryon interaction which is consistent with the light baryon spectra. We solve exactly the three-quark problem by means of the Faddeev method in momentum space. Heavy baryon spectrum shows a manifest compromise between perturbative and nonperturbative contributions. The flavor dependence of the one-gluon exchange is analyzed. We...

Source: http://arxiv.org/abs/hep-ph/0703257v1

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Jun 28, 2018
06/18

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J. Vijande; A. Valcarce; H. Garcilazo

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The ground state and excited spectra of baryons containing three identical heavy quarks, $b$ or $c$, have been recently calculated in nonperturbative lattice QCD. The energy of positive and negative parity excitations has been determined with high precision. Lattice results constitute a unique opportunity to learn about the quark-confinement mechanism as well as elucidating our knowledge about the nature of the strong force. We analyze the nonperturbative lattice QCD results by means of...

Topics: High Energy Physics - Phenomenology, Nuclear Theory, High Energy Physics - Lattice, High Energy...

Source: http://arxiv.org/abs/1507.03736

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Jun 29, 2018
06/18

by
H. Garcilazo; A. Valcarce; J. Vijande

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This paper provides results for the ground state and excited spectra of three-flavored doubly heavy baryons, $bcn$ and $bcs$. We take advantage of the spin-independent interaction recently obtained to reconcile the lattice SU(3) QCD static potential and the results of nonperturbative lattice QCD for the triply heavy baryon spectra. We show that the spin-dependent potential might be constrained on the basis of nonperturbative lattice QCD results for the spin splittings of three-flavored doubly...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1609.06886

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Sep 18, 2013
09/13

by
A. Valcarce; F. Fernandez; H. Garcilazo

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We calculated the mass and width of the $d'$ resonance inside nuclei within a nucleon-$\Delta$ model by including the self-energy of the $\Delta$ in the $N\Delta$ propagator. We found that in the nuclear medium the width of the $d'$ is increased by one order of magnitude while its mass changes only by a few MeV. This broadening of the width of the $d'$ resonance embedded in nuclei is consistent with the experimental observations so that the $d'$ can be understood as a $N\Delta$ resonance. Thus,...

Source: http://arxiv.org/abs/nucl-th/9606036v1

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Jun 29, 2018
06/18

by
H. Garcilazo; A. Valcarce; J. Vijande

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By using local central Yukawa-type interactions that reproduce the low-energy parameters of the latest updates of the Nijmegen ESC08c potentials we show that the $N\Xi$, $NN\Xi$, $N\Xi\Xi$ and $NN\Xi\Xi$ systems with maximal isospin are bound. Since in these states the strong decay $N\Xi\to\Lambda\Lambda$ is forbidden by isospin conservation, these strange few-body systems will be stable under the strong interaction. These results may suggest that other states with different number of $N$'s and...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1608.05192

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Jun 28, 2018
06/18

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J. Vijande; A. Valcarce; H. Garcilazo

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This paper provides results for the spectra of triply charmed and bottom baryons based on a constituent quark model approach. We take advantage of the assumption that potential models are expected to describe triply heavy baryons to a similar degree of accuracy as the successful results obtained in the charmonium and bottomonium sectors. The high precision calculation of the ground state and positive and negative parity excited states recently reported by nonperturbative lattice QCD provides us...

Topics: High Energy Physics - Phenomenology, Nuclear Theory, High Energy Physics - Lattice, High Energy...

Source: http://arxiv.org/abs/1507.03735

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Sep 19, 2013
09/13

by
A. Valcarce; H. Garcilazo; J. Vijande

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We investigate the structure of the SU(3) octet and decuplet baryons employing a constituent quark model designed for the study of the baryon-baryon interaction and successfully applied to the meson spectra. The model considers through the interacting potential perturbative, one-gluon exchange, and non-perturbative, boson exchanges and confinement, aspects of the underlying theory, QCD. We solve the three-quark problem by means of the Faddeev method in momentum space. We analyze the effect of...

Source: http://arxiv.org/abs/hep-ph/0507297v1

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Sep 18, 2013
09/13

by
A. Valcarce; F. Fernandez; H. Garcilazo

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Based on a quark cluster model for the non-strange sector that reproduces reasonably well the nucleon-nucleon system and the excitation of the $\Delta$ isobar, we generate a nucleon-$\Delta$ interaction and present the predictions for the several isospin two channels. The only attractive channels are $0^+$ and $0^-$, but not attractive enough to generate a resonance. If a resonance is artificially generated and is required to have the observed experimental mass, then our model predicts a width...

Source: http://arxiv.org/abs/nucl-th/9509012v1

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Sep 23, 2013
09/13

by
H. Garcilazo; A. Valcarce; F. Fernandez

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We have performed a Faddeev calculation of the baryon spectrum for the chiral constituent quark model including higher orbital angular momentum states. We have found that the effect of these states is important, although a description of the baryon spectrum of the same quality as the one given by including only the lowest-order configurations can be obtained. We have studied the effect of the pseudoscalar quark-quark interaction on the relative position of the positive- and negative-parity...

Source: http://arxiv.org/abs/nucl-th/0109004v1

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Jul 24, 2013
07/13

by
A. Valcarce; H. Garcilazo; J. Vijande

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The recent observation at CDF and D0 of $\Sigma_b$, $\Sigma^*_b$ and $\Xi_b$ baryons opens the door to the advent of new states in the bottom baryon sector. The states measured provide sufficient constraints to fix the parameters of phenomenological models. One may therefore consistently predict the full bottom baryon spectra. For this purpose we have solved exactly the three-quark problem by means of the Faddeev method in momentum space. We consider our guidance may help experimentalists in...

Source: http://arxiv.org/abs/0807.2973v1

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Sep 19, 2013
09/13

by
A. Valcarce; H. Garcilazo; T. F. Carames

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We derive strangeness -2 baryon-baryon interactions from a chiral constituent quark model including the full set of scalar mesons. The model has been tuned in the strangeness 0 and -1 two-baryon systems, providing parameter free predictions for the strangeness -2 case. We calculate elastic and inelastic $N\Xi$ and $\Lambda\Lambda$ cross sections which are consistent with the existing experimental data. We also calculate the two-body scattering lengths for the different spin-isospin channels.

Source: http://arxiv.org/abs/1009.1704v1

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Sep 19, 2013
09/13

by
H. Garcilazo; A. Valcarce; T. Fernandez-Carames

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Using the two-body interactions obtained from a chiral constituent quark model we study all $\Lambda NN$ and $\Sigma NN$ states with I=0,1,2 and J=1/2,3/2 at threshold, taking into account all three-body configurations with S and D wave components. We constrain further the limits for the $\Lambda N$ spin-triplet scattering length a_{1/2,1}. Using the hypertriton binding energy we find a narrow interval for the possible values of the $\Lambda N$ spin-singlet scattering length a_{1/2,0}. We found...

Source: http://arxiv.org/abs/0708.0199v1

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Jun 28, 2018
06/18

by
H. Garcilazo; A. Valcarce; T. F. Carames

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By solving exact three-body equations, we study the three-baryon system with charm $+1$. We look for possible bound states using baryon-baryon interactions obtained from a chiral constituent quark model. The smaller effect of the $\Lambda_c \leftrightarrow \Sigma_c$ conversion reverses the order of the $(I,J)=(0,1/2)$ and $(I,J)=(0,3/2)$ states, rather close on the strange sector. The diminishing of the kinetic energy due to the large reduced mass gives rise to a bound state in the...

Topics: High Energy Physics - Phenomenology, Nuclear Theory

Source: http://arxiv.org/abs/1508.03535

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Sep 19, 2013
09/13

by
H. Garcilazo; T. Fernandez-Carames; A. Valcarce

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We calculate the hypertriton binding energy and the $\Lambda d$ and $\Sigma d$ scattering lengths using baryon-baryon interactions obtained from a chiral constituent quark model. We study consistently the $\Lambda NN$ and $\Sigma NN$ systems analyzing the effect of the $\Sigma \leftrightarrow \Lambda$ conversion. Our interactions correctly predict the hypertriton binding energy. The $(I,J)=(0,3/2)$ $\Lambda NN$ channel is also attractive and it might have a bound state. From the condition of...

Source: http://arxiv.org/abs/hep-ph/0701275v2

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Sep 22, 2013
09/13

by
P. Gonzalez; A. Valcarce; H. Garcilazo; J. Vijande

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We perform a quark model calculation of the $b\bar{b}$ and $c\bar{c}$ spectra from a screened funnel potential form suggested by unquenched lattice calculations. A connection between the lattice screening parameter and an effective gluon mass directly derived from QCD is established. Spin-spin energy splittings, leptonic widths and radiative decays are also examined providing a test for the description of the states.

Source: http://arxiv.org/abs/hep-ph/0307310v1

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Sep 18, 2013
09/13

by
A. Valcarce; H. Garcilazo; F. Fernandez; P. Gonzalez

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We review the application of non-relativistic constituent quark models to study one, two and three non-strange baryon systems. We present results for the baryon spectra, potentials and observables of the NN, N$\Delta$, $\Delta\Delta$ and NN$^*(1440)$ systems, and also for the binding energies of three non-strange baryon systems. We make emphasis on observable effects related to quark antisymmetry and its interplay with quark dynamics.

Source: http://arxiv.org/abs/hep-ph/0502173v1

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107

Sep 17, 2013
09/13

by
J. Vijande; A. Valcarce; P. Gonzalez; H. Garcilazo

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We present a study of the baryon spectra for all flavor sectors within a constituent quark model. We address some of the outstanding problems in baryon spectroscopy, as for example the spin splitting evolution for te different flavor sectors, the flavor independence of confinement and the missing state problem.

Source: http://arxiv.org/abs/0711.4472v1

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Sep 18, 2013
09/13

by
M. T. Peña; H. Garcilazo; D. O. Riska

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The $\pi$, $\eta$ and $\rho$ exchange contributions to the cross-section for the reaction $pp\to pp\eta$ near threshold are calculated with a phenomenological description of the intermediate S11 (N(1535)) resonance for all exchange mechanisms. The final state interaction in the $pp$ system is described by realistic nucleon-nucleon interaction models. The sensitivity of the results to the phenomenological models for the $\eta$-nucleon transition amplitude and the nucleon-nucleon interaction is...

Source: http://arxiv.org/abs/nucl-th/0006011v1

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Sep 19, 2013
09/13

by
P. Gonzalez; J. Vijande; A. Valcarce; H. Garcilazo

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We show that nonstrange baryon resonances can be classified according to multiplets of $SU(4)\otimes O(3)$. We identify spectral regularities and degeneracies that allow us to predict the high spin spectrum from 2 to 3 GeV.

Source: http://arxiv.org/abs/hep-ph/0610257v1

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Sep 22, 2013
09/13

by
P. Gonzalez; A. Valcarce; J. Vijande; H. Garcilazo

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Recent lattice QCD calculations suggest a rather abrupt transition in the confinig potential from a linear to a constant behavior. We analyze the effects of such a fast deconfinement in the simplest non-relativistic system, bottomonium.

Source: http://arxiv.org/abs/hep-ph/0409202v1

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Sep 20, 2013
09/13

by
P. Gonzalez; J. Vijande; A. Valcarce; H. Garcilazo

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We extract, from a quark model potential that reproduces the number and ordering of nonstrange baryonic resonances up to 2.3 GeV, the quantum numbers for the dominant configurations in the ground and first non-radial excited states. From the pattern of quantum numbers we identify, from data, spectral regularities that allow us to predict the expected high spin low-lying spectrum from 2.3 to 3.0 GeV. $N-\Delta$ degeneracies and $N$ parity doublets showing up can be interpreted in terms of a...

Source: http://arxiv.org/abs/hep-ph/0608152v1

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Sep 21, 2013
09/13

by
A. Valcarce; F. Fernandez; E. Moro; H. Garcilazo

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We analyze the possible existence of a resonance in the $J^P=0^-$ channel with isospin two by means of nucleon-$\Delta$ interactions based on the constituent quark model. We solve the bound state and the scattering problem using two different potentials, a local and a non-local one. The non-local potential results to be the more attractive, although not enough to generate the experimentally predicted resonance.

Source: http://arxiv.org/abs/nucl-th/9508031v1

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Jul 22, 2013
07/13

by
A. Valcarce; J. Vijande; P. Gonzalez; H. Garcilazo

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We discuss recent results on heavy and light baryon spectroscopy

Source: http://arxiv.org/abs/0807.0394v1

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Sep 23, 2013
09/13

by
J. Vijande; H. Garcilazo; A. Valcarce; F. Fernandez

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We study the mass spectrum of baryons with two and three charmed quarks. For double charm baryons the spin splitting is found to be smaller than standard quark-model potential predictions. This splitting is not influenced either by the particular form of the confining potential or by the regularization taken for the contact term of the spin-spin potential. We consistently predict the spectra for triply charmed baryons.

Source: http://arxiv.org/abs/hep-ph/0408274v1

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Sep 19, 2013
09/13

by
P. Gonzalez; J. Vijande; A. Valcarce; H. Garcilazo

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We revise the role played by symmetry in the study of the low-lying baryon spectrum and comment on the difficulties when trying to generalize the symmetry pattern to higher energy states. We show that for the $(N,\Delta)$ part such a generalization is plausible allowing the identification of spectral regularities and the prediction of until now non-identified resonances.

Source: http://arxiv.org/abs/hep-ph/0610288v1

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Sep 17, 2013
09/13

by
A. Valcarce; J. Vijande; P. Gonzalez; H. Garcilazo

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We review some selected recent results on hadron spectroscopy and related theoretical studies based on constituent quark models.

Source: http://arxiv.org/abs/0711.3098v1

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Sep 23, 2013
09/13

by
J. Vijande; P. Gonzalez; H. Garcilazo; A. Valcarce

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We show that in a quark model scheme the use of a screened potential, suggested by lattice QCD, instead of an infinitely rising one with the interquark distance, provides a more adequate description of the high-energy baryon spectrum. In particular an almost perfect parallelism between the predicted and observed number of states comes out throwing new light about the so-called missing resonance problem.

Source: http://arxiv.org/abs/hep-ph/0312165v1

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Sep 20, 2013
09/13

by
T. Fernandez-Carames; A. Valcarce; H. Garcilazo; P. Gonzalez

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We use two-body potentials derived from a constituent quark cluster model to analyze the bound-state problem of the $\Sigma NN$ system. The observables of the two-body subsystems, $NN$ and $\Sigma N$, are well reproduced. We do not find $\Sigma NN$ bound states, but there are two attractive channels with a resonance close above the three-body threshold. These channels are the $(I,J)=(1,1/2)$ and $(0,1/2)$, their quantum numbers, widths and energy ordering consistent with the recently measured...

Source: http://arxiv.org/abs/hep-ph/0601252v1

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Sep 23, 2013
09/13

by
J. Vijande; A. Valcarce; T. F. Caramés; H. Garcilazo

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We present recent results of hadron spectroscopy and hadron-hadron interaction from the perspective of constituent quark models. We pay special attention to the role played by higher order Fock space components in the hadron spectra and the connection of this extension with the hadron-hadron interaction. The main goal of our description is to obtain a coherent understanding of the lowenergy hadron phenomenology without enforcing any particular model, to constrain its characteristics and learn...

Source: http://arxiv.org/abs/1212.4383v1

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Sep 23, 2013
09/13

by
A. Valcarce; J. Vijande; H. Garcilazo; T. F. Carames

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We discuss recent results of hadron spectroscopy and hadron-hadron interaction within a quark model framework. New experimental data could point to the important role played by higher order Fock space components on low-energy observables. Our aim is to obtain a coherent description of the low-energy hadron phenomenology to constrain QCD phenomenological models and try to learn about low-energy realizations of the theory. This long-range effort is based in adapting few-body techniques to study...

Source: http://arxiv.org/abs/1012.4633v1

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Jun 30, 2018
06/18

by
A. Gal; H. Garcilazo; A. Valcarce; T. Fernández-Caramés

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The Lambda_c(2286)-N system is studied in a chiral constituent quark model and the resulting s-wave interaction is used in separable form within three-body models of the pi-Lambda_c-N system with quantum numbers (C,I,JP)=(+1,3/2,2+). Separable interactions are also used for the dominant p-wave pion-baryon channels dominated by the Delta(1232) and Sigma_c(2520) resonances. Faddeev equations with relativistic kinematics are solved on the real axis to search for bound states and in the complex...

Topics: High Energy Physics - Phenomenology, Nuclear Experiment, Nuclear Theory, High Energy Physics -...

Source: http://arxiv.org/abs/1405.5094

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Jun 30, 2018
06/18

by
P. Alba; M. Amaryan; V. Begun; R. Bellwied; S. Borsanyi; W. Broniowski; S. Capstick; E. Chudakov; V. Crede; B. Dönigus; R. G. Edwards; Z. Fodor; H. Garcilazo; J. L. Goity; M. I. Gorenstein; J. Günther; L. Guo; P. Huovinen; S. Katz; M. Mai; D. M. Manley; V. Mantovani Sarti; E. Megías; F. Myhrer; J. Noronha-Hostler; H. Noumi; P. Parotto; A. Pasztor; I. Portillo Vazquez; K. Rajagopal; C. Ratti; J. Ritman; E. Ruiz Arriola; L. L. Salcedo; I. Strakovsky; J. Stroth; A. H. Tang; Y. Tsuchikawa; A....

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This Workshop brought top experts, researchers, postdocs, and students from high-energy heavy ion interactions, lattice QCD and hadronic physics communities together. YSTAR2016 discussed the impact of "missing" hyperon resonances on QCD thermodynamics, on freeze-out in heavy ion collisions, on the evolution of early universe, and on the spectroscopy of strange particles. Recent studies that compared lattice QCD predictions of thermodynamic properties of quark-gluon plasma at...

Topic: High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1701.07346