scholarly journals HYBRID STATES FROM CONSTITUENT GLUE MODEL

2008 ◽  
Vol 23 (32) ◽  
pp. 5229-5250 ◽  
Author(s):  
FARIDA IDDIR ◽  
LAHOUARI SEMLALA
Keyword(s):  
Quark Model ◽  
Hybrid Meson ◽  
Hybrid Mesons ◽  
Decay Widths ◽  
The Masses

The hybrid meson is one of the most interesting new hadron species beyond the naive quark model. It acquire great attention both from the theoretical and experimental efforts. Many good candidates have been claimed to be observed, but there is no absolute confirmation about the existence of hybrid mesons. In the present work we propose new calculations of the masses and decay widths of the hybrid mesons in the context of constituent gluon model.

Masses and Decays of Charmed and Bottom Baryons

1997 ◽  
Vol 12 (24) ◽  
pp. 1791-1802 ◽  
Author(s):  
Fayyazuddin ◽  
Riazuddin
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Hadronic Decays ◽  
Present Experimental Data ◽  
Heavy Baryons ◽  
Nonrelativistic Quark Model ◽  
Decay Widths ◽  
The Masses

Using SU(3) and the nonrelativistic quark model, the masses and the strong hadronic decays of heavy baryons are discussed. A number of results for the decay widths are obtained using the present experimental data as input.

scholarly journals THE HYBRID MESON: NEW RESULTS FROM THE UPDATED mg AND αs PARAMETERS

2011 ◽  
Vol 26 (23) ◽  
pp. 4101-4110 ◽  
Author(s):  
L. SEMLALA ◽  
F. IDDIR
Keyword(s):  
Coupling Constant ◽  
Hybrid Meson ◽  
Gluon Mass ◽  
Running Coupling ◽  
Running Coupling Constant ◽  
Decay Widths ◽  
Nonperturbative Qcd ◽  
The Masses ◽  
Meson States

We present new results concerning the masses and the decay widths of the most interesting hybrid meson states taking as inputs the gluon mass mg and the nonperturbative QCD running coupling constant αs(0) coming from both LQCD and SDE recent estimations.

scholarly journals Nonleptonic and semileptonic $${\Lambda _b} \rightarrow {\Lambda _c}$$ transitions in a potential quark model

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
S. Rahmani ◽  
H. Hassanabadi ◽  
Jan Kříž
Keyword(s):  
Heavy Quark ◽  
Quark Model ◽  
Semileptonic Decay ◽  
Hyperspherical Coordinates ◽  
Logarithmic Term ◽  
Decay Widths ◽  
Heavy Quark Limit ◽  
The Masses

Abstract Nonleptonic and semileptonic decay widths of $${\Lambda _b} \rightarrow {\Lambda _c}$$Λb→Λc are analyzed within heavy quark limit and Isgur-Wise formalism. A modified QCD Cornell interaction with the additional logarithmic term in the hyperspherical coordinates is considered and the masses of heavy flavour baryons are calculated. The obtained masses are consequently employed to study the rates of $${\Lambda _b} \rightarrow {\Lambda _c}$$Λb→Λc. The achieved results are motivating.

scholarly journals STRUCTURE OF LIGHT AND HEAVY PENTAQUARKS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1797-1802 ◽  
Author(s):  
FL. STANCU
Keyword(s):  
Variational Method ◽  
Hyperfine Interaction ◽  
Quark Model ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Positive Parity ◽  
Model Based ◽  
Quantum Numbers ◽  
The Masses

Light and heavy pentaquarks are described within a constituent quark model based on a spin-flavor hyperfine interaction. In this model the lowest state acquires positive parity. The masses of the light antidecuplet members are calculated dynamically using a variational method. It is shown that the octet and antidecuplet states with the same quantum numbers mix ideally due to SU (3)F breaking. Masses of the charmed antisextet pentaquarks are predicted within the same model.

PROCEDURE FOR GENERATING EQUATIONS IN LINEAR SIGMA MODEL

2011 ◽  
Vol 26 (14) ◽  
pp. 2327-2352 ◽  
Author(s):  
AMIR H. FARIBORZ
Keyword(s):  
Scattering Amplitudes ◽  
Sigma Model ◽  
Point Interaction ◽  
Low Energy ◽  
Linear Sigma Model ◽  
Pseudoscalar Mesons ◽  
Decay Widths ◽  
Symmetry Breaking Term ◽  
The Masses ◽  
Breaking Term

A procedure for implementation of the generating equations in the linear sigma model of low energy QCD is presented. For any explicit symmetry breaking term, this procedure computes the masses of scalar and pseudoscalar mesons as well as various three-point and four-point interaction vertices that are needed in calculation of different decay widths and scattering amplitudes.

THE CHIRAL QUARK MODEL AND BARYON PHENOMENOLOGY

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1785-1790 ◽  
Author(s):  
D. O. RISKA
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Axial Current ◽  
Chiral Quark Model ◽  
Pion Decay ◽  
Decay Widths ◽  
Nucleon Form Factors ◽  
Baryon Spectra ◽  
Baryon Resonances ◽  
Covariant Quark Model

The chiral quark model posits that pions couple to the axial current of constituent quarks. This chiral pion coupling governs the pion decays of baryon resonances and also implies pion and multipion interactions between the quarks. The qualitative features of this model for the description of pionic decay widths and baryon spectra are outlined. When the covariant quark model wave function for the nucleon is chosen so as to describe the empirical nucleon form factors the pion decay widths of the positive parity resonances are underpredicted. This indicates the presence of significant multiquark components in these resonances.

RADIATIVE DECAYS OF BARYONS IN A FIELD THEORETIC QUARK MODEL

1996 ◽  
Vol 11 (32) ◽  
pp. 5685-5700 ◽  
Author(s):  
A.R. PANDA ◽  
R.K. SAHOO
Keyword(s):  
Quark Model ◽  
Radiative Decay ◽  
Constituent Quark ◽  
Theoretical Calculations ◽  
Wave Functions ◽  
Radiative Decays ◽  
Quark Field ◽  
Decay Widths ◽  
Helicity Amplitudes ◽  
Decays Of Baryons

Radiative decays of baryons are considered in a field theoretic quark model of composite hadrons where the translationally invariant SU (6) hadron states are described by constituent quark field operators and harmonic oscillator wave functions. The constituent quark field operators of the model satisfying the equal time algebra are also Lorentz-boosted through a spin rotation to describe hadrons in motion. The model, like its earlier success in describing the different hadronic phenomena, in the present investigation without any free parameters, obtains the radiative decay widths and helicity amplitudes in reasonable agreement with other theoretical calculations as well as with the available experimental measurements.

scholarly journals Mass spectra and decays of ground and orbitally excited cb̄ states in nonrelativistic quark model

2017 ◽  
Vol 32 (04) ◽  
pp. 1750021 ◽  
Author(s):  
Antony Prakash Monteiro ◽  
Manjunath Bhat ◽  
K. B. Vijaya Kumar
Keyword(s):  
Quark Model ◽  
Mass Spectra ◽  
Radiative Decay ◽  
Weak Decay ◽  
Exchange Potential ◽  
Complete Spectrum ◽  
Confinement Potential ◽  
Gluon Exchange ◽  
Nonrelativistic Quark Model ◽  
Decay Widths

The complete spectrum of [Formula: see text] states is obtained in a phenomenological nonrelativistic quark model (NRQM), which consists of a confinement potential and one gluon exchange potential (OGEP) as effective quark–antiquark potential. We make predictions for the radiative decay (E1 and M1) widths and weak decay widths of [Formula: see text] states in the framework of NRQM formalism.

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 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.

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