0000000000159883
AUTHOR
Javier Vijande Asenjo
A SU(4) circle times O(3) scheme for nonstrange baryons
4 pages, 3 tables.-- PACS nrs.: 12.39.Jh, 14.20.-c, 14.20.Gk.-- ISI Article Identifier: 000245667300027.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0610257
Dynamical study of QQ-(u)over-bar (d)over-bar mesons
It has been recently conjectured by Selem and Wilczek [1] the existence of a ss-[ud] meson due to strong correlations between the two light antiquarks. We make a detailed study of this system within a dynamical quark model which has proven to be successful in reproducing the most important features of low-energy hadron phenomenology. Our results, obtained within a parameter-free calculation, show that the antidiquark component of the ssu d system indeed entails the stronger attraction, and drives its energy much lower than the N Xi threshold, but still above the (KK*-)-K-0 or (KK-)-K-*0 thresholds. We have also studied the ccu d and bbu d systems. Exotic mesons are only expected to exist in…
The rho-omega splitting in constituent quark models
PACS: 12.39.Jh; 14.40.-n.--ArXiv pre-print avaible at: http://arxiv.org/abs/0903.2949v1
Describing non-QQ candidates
Despite the apparent simplicity of meson spectroscopy there are some states which cannot be accommodated in the usual q (q) over bar structure. Among them there are either exotic states as the X(1600) or the recently measured charm states D-sJ(*) and X(3872) and some of the light scalar mesons. In this work we present a possible description of these states in terms of tetraquarks.
Do c(c)over-barn(n)over-tilde bound states exist?
The four-quark system c (c) over barn (n) over tilde is studied in the framework of the constituent quark model. Using different types of quark-quark potentials, we solve the four-body Schrodinger equation by means of the hyperspherical harmonic formalism. Exploring the low laying J(PC) states for different isospin configurations no four-quark bound states have been found. Of particular interest is the possible four-quark structure of the X(3872). We rule out the possibility that this particle is a compact tetraquark system, unless additional correlations, either in the form of diquarks or at the level of the interacting potential, not considered in simple quark models do contribute.
Explanation of the Delta(-)(5/2)(1930) as a rho Delta bound state
19 pags, 8 figs.-- ISI article identifier:000263816400064.-- ArXiv pre-print avaible at:http://arxiv.org/abs/0812.3368
Too many X's, Y's and Z's?
Heavy meson spectroscopy above open flavor thresholds has become a challenge both from the experimental and theoretical points of view. Experimentally, several signals have been interpreted as meson resonances with unusual properties; theoretically, such signals may be identified with meson-meson molecules or compact multiquark structures. We analyze the influence of thresholds on heavy meson spectroscopy comparing different flavor sectors and quantum numbers. The validity of a quark-model picture above open-flavor thresholds would severely restrict the number of channels that may lodge multiquark structures as meson-meson molecules.
b(b)over-bar description with a screened potential
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.