scholarly journals DIQUARKS AND PENTAQUARK NATURE

2006 ◽  
Vol 15 (01) ◽  
pp. 87-99
Author(s):  
S. M. GERASYUTA ◽  
V. I. KOCHKIN
Keyword(s):  
Dispersion Relation ◽  
Mass Spectra ◽  
Negative Parity ◽  
The Masses ◽  
S Quarks

The relativistic five-quark equations are found in the framework of the dispersion relation technique. The five-quark amplitudes for the low-lying pentaquarks including the u, d, s-quarks are calculated. The poles of these amplitudes determine the masses of the nucleon and the Ξ–– pentaquarks. The mass spectra of the lowest pentaquarks with the [Formula: see text] are calculated. The mass values of the positive and negative parity pentaquarks are determined by the mixing of both 0+ and 1+ diquarks.

scholarly journals RELATIVISTIC QUARK MODEL AND PENTAQUARK SPECTROSCOPY

2003 ◽  
Vol 12 (06) ◽  
pp. 793-807 ◽  
Author(s):  
S. M. GERASYUTA ◽  
V. I. KOCHKIN
Keyword(s):  
Dispersion Relation ◽  
Quark Model ◽  
Mass Spectra ◽  
Relativistic Quark Model ◽  
The Masses ◽  
Meson States

Relativistic five-quark equations are found in the framework of the dispersion relation technique. The solutions of these equations using the method based on the extraction of the leading singularities of the amplitudes are obtained. The five-quark amplitudes for the low-lying pentaquarks are calculated under the condition that flavor SU(3) symmetry holds. The poles of the five-quark amplitudes determine the masses of the lowest pentaquarks. The mass spectra of pentaquarks which contain only light quarks are calculated. The calculation of pentaquark amplitudes estimates the contributions of three subamplitudes: molecular subamplitude BM, Mqqq subamplitude and [Formula: see text] subamplitude. The main contributions to the pentaquark amplitude are determined by the subamplitudes, which include the meson states M.

scholarly journals Medium effects and parity doubling of hyperons across the deconfinement phase transition

2018 ◽  
Vol 175 ◽  
pp. 07016 ◽  
Author(s):  
Gert Aarts ◽  
Chris Allton ◽  
Davide De Boni ◽  
Simon Hands ◽  
Benjamin Jäger ◽  
...  
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion Phenomenology ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Negative Parity ◽  
Chiral Symmetry Restoration ◽  
Medium Effects ◽  
Deconfinement Phase Transition ◽  
The Masses ◽  
S Quarks

We analyse the behaviour of hyperons with strangeness S = –1,–2,–3 in the hadronic and quark gluon plasma phases, with particular interest in parity doubling and its emergence as the temperature grows. This study uses our FASTSUM anisotropic Nf = 2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature, Tc. The positive-parity groundstate masses are found to be largely temperature independent below Tc, whereas the negative-parity ones decrease considerably as the temperature increases. Close to the transition, the masses are almost degenerate, in line with the expectation from chiral symmetry restoration. This may be of interest for heavy-ion phenomenology. In particular we show an application of this effect to the Hadron Resonance Gas model. A clear signal of parity doubling is found above Tc in all hyperon channels, with the strength of the effect depending on the number of s-quarks in the baryons.

scholarly journals CHARMED (70, 1-) BARYON MULTIPLET

2008 ◽  
Vol 17 (04) ◽  
pp. 585-610 ◽  
Author(s):  
S. M. GERASYUTA ◽  
E. E. MATSKEVICH
Keyword(s):  
Experimental Data ◽  
Dispersion Relation ◽  
Approximate Solutions ◽  
Negative Parity ◽  
Relativistic Quark Model ◽  
Charmed Baryons ◽  
Charmed Baryon ◽  
Calculated Mass ◽  
The Masses ◽  
Good Agreement

The masses of negative parity (70, 1-) charmed nonstrange baryons are calculated in the relativistic quark model. The relativistic three-quark equations of the (70, 1-) charmed baryon multiplet 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 (70, 1-) charmed baryons are in good agreement with the experimental data.

scholarly journals Bottom (70,1-) baryon multiplet

2020 ◽  
Vol 164 ◽  
pp. 01008
Author(s):  
Elena Matskevich
Keyword(s):  
Dispersion Relation ◽  
Quark Model ◽  
Approximate Solutions ◽  
Negative Parity ◽  
Relativistic Quark Model ◽  
Systems Of Equations ◽  
The Masses ◽  
Bottom Baryon

The aim of this paper is to derive systems of equations for the amplitudes for the case of negative parity (70,1-) bottom nonstrange baryons and to calculate the masses of these particles. In order to calculate masses of (70,1-) bottom baryons we use 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 relativistic three-quark equations of the (70,1-) bottom baryon multiplet are derived. 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.

scholarly journals MASSES OF LIGHT MESONS IN THE RELATIVISTIC QUARK MODEL

2005 ◽  
Vol 20 (25) ◽  
pp. 1887-1893 ◽  
Author(s):  
D. EBERT ◽  
R. N. FAUSTOV ◽  
V. O. GALKIN
Keyword(s):  
Quark Model ◽  
Ground State ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Relativistic Quark Model ◽  
S Wave ◽  
Confining Potential ◽  
Relativistic Formula ◽  
The Masses ◽  
S Quarks

The masses of the S-wave mesons consisting of the light (u, d, s) quarks are calculated within the constituent quark model. The relativistic Schrödinger-like equation with a confining potential is numerically solved for the complete relativistic [Formula: see text] potential including both spin-independent and spin-dependent terms. The obtained masses of the ground state π, ρ, K, K* and ϕ mesons and their first radial excitations are in a reasonably good overall agreement with experimental data.

scholarly journals Doubly hidden-charm/bottom QQQQ tetraquark states

2018 ◽  
Vol 182 ◽  
pp. 02028 ◽  
Author(s):  
Wei Chen ◽  
Hua-Xing Chen ◽  
Xiang Liu ◽  
T.G. Steele ◽  
Shi-Lin Zhu
Keyword(s):  
Mass Spectra ◽  
Sum Rule ◽  
Rule Method ◽  
The Masses

We study the mass spectra for the cccc and bbbb tetraquark states by developing a moment sum rule method. Our results show that the bbbb tetraquarks lie below the threshold of ηb(1S) ηb(1S ). They are probably stable and very narrow. The masses for the doubly hidden-charm states cccc are higher than the spontaneous dissociation thresholds of two charmonium mesons. We suggest to search for such states in the J/Ψ/J/Ψ and Ψc(1S) Ψc(1S) channels.

scholarly journals Search for new neutral gauge bosons with the CMS Experiment at the LHC

2018 ◽  
Vol 177 ◽  
pp. 04005
Author(s):  
Alexander Lanyov ◽  
Sergei Shmatov ◽  
Ilia Zhizhin
Keyword(s):  
Mass Spectra ◽  
Production Cross ◽  
New Physics ◽  
Gauge Bosons ◽  
Proton Proton ◽  
Proton Collisions ◽  
Physics Beyond Standard Model ◽  
Cms Experiment ◽  
The Masses ◽  
Proton Proton Collisions

A search for narrow resonances in dimuon invariant mass spectra has been performed using 13 fb-1 data obtained in 2016 from proton-proton collisions at √s = 13 TeV with the CMS experiment at the LHC. No evidence for physics beyond standard model is found. Limits on the production cross section and the masses of hypothetical particles that could appear in the scenarios of new physics have been set.

Baryonia with open and hidden bottom

2020 ◽  
Vol 29 (06) ◽  
pp. 2050038
Author(s):  
S. M. Gerasyuta ◽  
E. E. Matskevich
Keyword(s):  
Dispersion Relation ◽  
The Masses

The relativistic six-quark equations are found in the framework of the dispersion relation technique. The bottom baryonia are constructed without the mixing of the quarks and antiquarks. The relativistic six-quark amplitudes of the bottom baryonia with the open and hidden bottom are calculated. The poles of these amplitudes determine the masses of bottom baryonia. 19 masses of baryonia are predicted.

Dispersion Relation for Generally Damped Periodic Materials

2010 ◽  
Author(s):  
Michael J. Frazier ◽  
Mahmoud I. Hussein
Keyword(s):  
Dispersion Relation ◽  
Damping Ratio ◽  
Phononic Crystal ◽  
Base Material ◽  
Lumped Parameter Model ◽  
Elastic Continuum ◽  
Lumped Parameter ◽  
The Masses ◽  
Periodic Materials ◽  
Damping Model

In this paper, we present a theoretical formalism for the study of damped periodic materials. First we consider a lumped parameter model consisting of two masses in the unit cell whereby the masses are connected by springs and dashpot viscous dampers. We then extend our analysis to the study of a two-dimensional phononic crystal, modeled as an elastic continuum, and consisting of a periodic arrangement of square inclusions distributed in a matrix base material. For our damping model, we consider both proportional damping and general damping. Our results demonstrate the effects that damping have on the dispersion relation and damping ratio band structure.

scholarly journals DIBARYONS WITH TWO HEAVY QUARKS

2012 ◽  
Vol 21 (06) ◽  
pp. 1250058 ◽  
Author(s):  
S. M. GERASYUTA ◽  
E. E. MATSKEVICH
Keyword(s):  
Dispersion Relation ◽  
Approximate Solutions ◽  
Heavy Quarks ◽  
B Quarks ◽  
The Masses

The relativistic six-quark equations are constructed in the framework of the dispersion relation technique. The relativistic six-quark amplitudes of dibaryons including the light u, d and heavy c, b quarks are calculated. The approximate solutions of these equations using the method based on the extraction of leading singularities of the heavy hexaquark amplitudes are obtained. The poles of these amplitudes determine the masses of charmed and bottom dibaryons with the isospins I = 0, 1, 2 and the spin-parities JP = 0+, 1+, 2+.

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