The mass spectrum of the baryon excited states in the static model

1967 ◽  
Vol 1 (2) ◽  
pp. 85-95 ◽  
Author(s):  
M. Noga
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Static Model

Mass spectrum and leptonic decay constants of ground and radially excited states of ηc and ηb in a Bethe–Salpeter equation framework

2015 ◽  
Vol 24 (04) ◽  
pp. 1550030 ◽  
Author(s):  
Hluf Negash ◽  
Shashank Bhatnagar
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Ground State ◽  
Reasonable Agreement ◽  
Equal Mass ◽  
Leptonic Decay ◽  
Decay Constants ◽  
Pseudoscalar Mesons

In this paper, we study the mass spectrum and decay constants of ground state (1S) and radially excited states (2S and 3S) of heavy equal mass pseudoscalar mesons, ηc and ηb. We have employed the framework of Bethe–Salpeter equation (BSE) under Covariant Instantaneous Ansatz (CIA). Our predictions are in reasonable agreement with the data on available states and results of other models.

scholarly journals Radiative Decay Widths of Ground and Excited States of Vector Charmonium and Bottomonium

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Hluf Negash ◽  
Shashank Bhatnagar
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Mass Spectra ◽  
Reasonable Agreement ◽  
Radiative Decay ◽  
Decay Constants ◽  
Two Photon ◽  
Quantum Numbers ◽  
Decay Widths ◽  
Input Parameters

We study the radiative decay widths of vector quarkonia for the process of J/ψ(nS)→ηc(nS)γ and Υ(nS)→ηb(nS)γ (for principal quantum numbers n=1,2,3) in the framework of Bethe-Salpeter equation under the covariant instantaneous ansatz using a 4×4 form of BSE. The parameters of the framework were determined by a fit to the mass spectrum of ground states of pseudoscalar and vector quarkonia, such as ηc, ηb, J/ψ, and Υ. These input parameters so fixed were found to give good agreements with data on mass spectra of ground and excited states of pseudoscalar and vector quarkonia, leptonic decay constants of pseudoscalar and vector quarkonia, two-photon decays, and two-gluon decays of pseudoscalar quarkonia in our recent paper. With these input parameters so fixed, the radiative decay widths of ground (1S) and excited (2S,3S) states of heavy vector quarkonia (J/Ψ and Υ) are calculated and found to be in reasonable agreement with data.

On The Mass Spectrum of Elementary Particles

2021 ◽  
Vol 4 (1) ◽  
Keyword(s):  
Excited State ◽  
Mass Spectrum ◽  
Cosmic Rays ◽  
Excited States ◽  
Magnetic Moments ◽  
Elementary Particles ◽  
Fractional Charge

In the 50s of the last century, M.I. Danysh and J. Pniewski discovered the existence of hypernuclei. In them under the action of cosmic rays, one of nucleons was turned into an excited state. In this paper, it is shown that masses and magnetic moments of such excitations coincide with properties of some elementary particles. Based on this consent, a number of elementary particles should be considered as excited states of different combinations of electrons, positrons, and protons, rather than as composed from quarks with a fractional charge.

SPECTROSCOPY OF LIGHT HADRONS ON ANISOTROPIC LATTICES

2006 ◽  
Vol 21 (26) ◽  
pp. 5253-5274
Author(s):  
FRANK X. LEE
Keyword(s):  
Mass Spectrum ◽  
Lattice Qcd ◽  
Excited States ◽  
Ground State ◽  
Quark Mass ◽  
Tree Level ◽  
Mass Dependence ◽  
Anisotropic Lattices ◽  
Quark Mass Dependence ◽  
The Masses

The mass spectrum of spin-1/2 baryons in both parity channels is computed using the methods of lattice QCD in the quenched approximation. An anisotropic action with anisotropy as/at = 3 is employed, using tree-level coefficients with tadpole improvement. Clear splittings from the nucleon ground state are observed with smeared operators and 500 configurations. Methods for extracting the first excited states are investigated. Using the quark mass dependence of the masses, qualitative comparisons are made with previous calculations and experiment.

scholarly journals Higher Order Perturbation Corrections of Rotating Excited States in the Standard SU(3) Skyrme Model to Baryon Mass Spectrum

1997 ◽  
Vol 12 (05) ◽  
pp. 873-890 ◽  
Author(s):  
Jin-Ping Li ◽  
Mu-Lin Yan ◽  
Rong-Hua Yu
Keyword(s):  
Experimental Data ◽  
Mass Spectrum ◽  
Excited States ◽  
Higher Order ◽  
Skyrme Model ◽  
Order Perturbation ◽  
Third Order ◽  
The Third ◽  
Baryon Mass ◽  
Higher Order Corrections

The higher order corrections of SU(3) rotating excited states to the Gell-Mann–Okubo Relations (or GOR) are presented in the standard SU(3) Skyrme model. The Improved GOR (or IGOR) are obtained. The results show the IGOR for decuplet up to the third order and for octet up to the second order are much compatible with the experimental data. But things become quite inadequate for the octet to the third order. In order to overcome the inadequacy, a heuristic discussion is presented. The properties of SU(3) rotating excited states 27-let (with spin [Formula: see text] or [Formula: see text]), 10*-let (with spin [Formula: see text]) and 35-let (with spin [Formula: see text]) are also discussed.

scholarly journals Radially excited axial-vector mesons in the extended Nambu–Jona-Lasinio model

2014 ◽  
Vol 29 (24) ◽  
pp. 1450125 ◽  
Author(s):  
A. V. Vishneva ◽  
M. K. Volkov
Keyword(s):  
Experimental Data ◽  
Excited State ◽  
Mass Spectrum ◽  
Excited States ◽  
Axial Vector ◽  
Form Factors ◽  
Radiative Decays ◽  
Vector Mesons ◽  
Polynomial Type ◽  
Quark Momentum

The first radial excitations of axial-vector mesons are considered in the framework of the extended U(3) × U(3) Nambu–Jona-Lasinio model. We calculate the mass spectrum of a1, f1 and also strange axial-vector mesons. For description of radially excited states, we used the form factors of polynomial type of the second order in transverse quark momentum. For the ground- and excited-state mesons consisting of light quarks we have calculated the widths of a number of strong and radiative decays. We got satisfactory agreement with experimental data for the ground states. A set of predictions for the excited states of mesons is given.

scholarly journals Spectroscopy of ground and excited states of pseudoscalar and vector charmonium and bottomonium

2016 ◽  
Vol 25 (08) ◽  
pp. 1650059 ◽  
Author(s):  
Hluf Negash ◽  
Shashank Bhatnagar
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Weak Decay ◽  
Mass Spectral ◽  
Decay Constants ◽  
Photon Decay ◽  
Oscillator Basis ◽  
Decay Widths ◽  
State Formula ◽  
Spectral Equation

In this paper, we calculate the mass spectrum, weak decay constants, two photon decay widths, and two-gluon decay widths of ground ([Formula: see text]) and radially excited ([Formula: see text]) states of pseudoscalar charmoniuum and bottomonium such as [Formula: see text] and [Formula: see text], as well as the mass spectrum and leptonic decay constants of ground state ([Formula: see text]), excited ([Formula: see text]) states of vector charmonium and bottomonium such as [Formula: see text], and [Formula: see text], using the formulation of Bethe–Salpeter equation under covariant instantaneous ansatz (CIA). Our results are in good agreement with data (where ever available) and other models. In this framework, from the beginning, we employ a [Formula: see text] representation for two-body ([Formula: see text]) BS amplitude for calculating both the mass spectra as well as the transition amplitudes. However, the price we have to pay is to solve a coupled set of equations for both pseudoscalar and vector quarkonia, which we have explicitly shown get decoupled in the heavy-quark approximation, leading to mass spectral equation with analytical solutions for both masses, as well as eigenfunctions for all the above states, in an approximate harmonic oscillator basis. The analytical forms of eigenfunctions for ground and excited states so obtained are used to evaluate the decay constants and decay widths for different processes.

scholarly journals Revisit the tetraquark candidates in the J/ψJ/ψ mass spectrum

2021 ◽  
Vol 36 (02) ◽  
pp. 2150014
Author(s):  
Zhi-Gang Wang
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Ground State ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Text Type ◽  
State Formula ◽  
Broad Structure ◽  
Basic Constituent

In this paper, we introduce a relative [Formula: see text]-wave to construct the doubly-charm axialvector diquark operator, then take the doubly-charm axialvector (anti-)diquark operator as the basic constituent to construct the scalar and tensor tetraquark currents to study the scalar, axialvector and tensor fully-charm tetraquark states with the QCD sum rules. We observe that the ground state [Formula: see text]-type tetraquark states and the first radial excited states of the [Formula: see text]-type tetraquark states have almost degenerated masses, where the [Formula: see text] and [Formula: see text] stand for the diquark operators with and without the relative [Formula: see text]-wave, respectively, the broad structure above the [Formula: see text] threshold maybe consist of several diquark–antidiquark-type fully-charm tetraquark states.

scholarly journals Excited states of isolated fermions in the Higgs phase of gauge Higgs theories

2022 ◽  
Vol 258 ◽  
pp. 02001
Author(s):  
Jeff Greensite ◽  
Kazue Matsuyama
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Present Evidence ◽  
Localized Excitations ◽  
Composite Objects ◽  
Higgs Fields

We present evidence that seemingly elementary and non-composite objects, namely isolated static fermions in certain gauge Higgs theories, have a mass spectrum corresponding to localized excitations of the surrounding gauge and Higgs fields.

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