85 research outputs found

### S-wave bottom baryons

The masses of S-wave bottom baryons are calculated in the framework of
coupled-channel formalism. The relativistic three-quark equations for the
bottom baryons using the dispersion relation technique are found. The
approximate solutions of these equations based on the extraction of leading
singularities of the amplitude are obtained. The calculated mass values of
S-wave bottom baryons are in good agreement with the experimental ones.Comment: 14 pages, latex, typos correcte

### Baryonium X(1835)

The relativistic six-quark equations including the u, d quarks and antiquarks
are found. The nonstrange baryonia B/bar B are contructed without the mixing of
the quarks and antiquarks. The relativistic six-quark amplitudes of the
baryonia are calculed. The poles of these amplitudes determine the masses of
baryonia. 16 masses of baryonia are predicted.Comment: 14 page

### Molecular state $N\Xi$ in the coupled-channel formalism

The relativistic six-quark equations for the molecule $N\Xi$ are found in the
dispersion relation technique. The relativistic six-quark amplitudes of the
hexaquark including the quarks of three flavors ($u$, $d$, $s$) are calculated.
The pole of these amplitudes determines the mass of $N\Xi$ state $M=2252\,
MeV$. The binding energy is equal to $3\, MeV$.Comment: 8 page

### Form factors of $S$-wave charmed baryon multiplet $J^P={1/2}^+$

Electric form factors of $S$-wave charmed baryons are calculated within the
relativistic quark model in the region of low and intermediate momentum
transfers, $Q^2 \le 1 GeV^2$. The charge radii of low-lying charmed baryons are
determined.Comment: 8 pages, late

### Excited ${\bf (70,1^-)}$ baryon resonances in the relativistic quark model

The relativistic three-quark equations of the ${\bf (70,1^-)}$ baryons are
found in the framework of the dispersion relation technique. The approximate
solutions of these equations using the method based on the extraction of
leading singularities of the amplitude are obtained. The calculated mass values
of the ${\bf (70,1^-)}$ multiplet are in good agreement with the experimental
ones.Comment: Latex, 37 pages, 3 figure

### Bottom ${\bf (70,1^-)}$ baryon multiplet

The masses of negative parity $(70,1^-)$ bottom nonstrange baryons are
calculated in the relativistic quark model. The relativistic three-quark
equations of the $(70,1^-)$ bottom baryon multiplet are derived in the
framework of the dispersion relation technique. The approximate solutions of
these equations using the method based on the extraction of leading
singularities of the amplitude are obtained. The masses of 21 baryons are
predicted.Comment: 14 pages. arXiv admin note: substantial text overlap with
arXiv:0709.0397, arXiv:0706.3135, arXiv:hep-ph/070112

### Relativistic quark-gluon description of $^3 He$

The relativistic nine-quark equations are found in the framework of the
dispersion relation technique. $^3 He$ nucleus is described by these
equations. We consider the $^3 He$ as the system of interacting quarks and
gluons. The approximate solutions of these equations using the method based on
the extraction of leading singularities of the amplitudes are obtained. The
relativistic nine-quark amplitudes of $^3 He$, including the $u$, $d$ quarks
are calculated. The poles of these amplitudes determine the mass of nine-quark
system. The $^3 He$ mass $M=2809\, MeV$ is calculated. The gluon coupling
constant in the light nuclei region is equal to $g=0.1536$. The gluon
interaction of $^3 He$ is obtained in 2 -- 3 time smaller as compared with
baryon interaction.Comment: 19 pages. arXiv admin note: substantial text overlap with
arXiv:1009.3365, arXiv:1003.025

### Nonstrange baryonia

The relativistic six-quark equations including the $u$, $d$ quarks and
antiquarks are found. The nonstrange baryonia $B \bar B$ are constructed
without the mixing of the quarks and antiquarks. The relativistic six-quark
amplitudes of the baryonia are calculated. The poles of these amplitudes
determine the masses of baryonia. 15 masses of baryonia are predicted. The mass
of baryonium with the spin-parity $J^P=0^-$ $M=1835\, MeV$ is used as a fit.Comment: 28 pages, late

### Low-lying hypernuclei in the relativistic quark-gluon model

Low-lying hypernuclei $^3_{\Lambda}H$, $^3_{\Sigma}H$, $^3_{\Lambda}He$, $^3_{\Sigma}He$ are described by the relativistic nine-quark equations in the
framework of the dispersion relation technique. The approximate solutions of
these equations using the method based on the extraction of leading
singularities of the amplitudes are obtained. The relativistic nine-quark
amplitudes of hypernuclei, including the quarks of three flavors ($u$, $d$,
$s$) are calculated. The poles of these amplitudes determine the masses of
hypernuclei. The mass of state $^3_{\Lambda}H$ with the isospin I=0 and the
spin-parity $J^P=\frac{1}{2}^+$ is equal to $M=2991\, MeV$.Comment: 8 pages. arXiv admin note: substantial text overlap with
arXiv:1211.0667; and text overlap with arXiv:1206.5219 by other author

### Heavy hypernuclei with $A=3$ in a relativistic quark-gluon model

We generalized our approach to the hypernuclei with $A=B=3$ containing one
charm or one bottom quark. We derive the relativistic nine-quark equations
using the dispersion relation technique. The hypernuclei as the system of
interacting quarks and gluons are considered. The relativistic nine-quark
amplitudes of hypernuclei, including the constituent quarks with the charm or
bottom are calculated. The approximate solutions of these equations are
obtained using a method based on the extraction of leading singularities of the
amplitudes. The poles of the multiquark amplitudes allow us to determine the
masses and the binding energy of hypernuclei with the $A=3$. We predict the
mass spectrum of hypernuclei with $A=3$, which is valuable to further
experimental study of the hypernuclei with charm and bottom.Comment: 10 pages. arXiv admin note: text overlap with arXiv:1410.2551; text
overlap with arXiv:1301.5790 by other author

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