ϒand possible heavy-meson mass spectra

1978 ◽  
Vol 18 (1) ◽  
pp. 341-343
Author(s):  
Kohji Hirata ◽  
Tsunehiro Kobayashi ◽  
Nobuyuki Nakamaru
Keyword(s):  
Mass Spectra ◽  
Heavy Meson ◽  
Meson Mass

Orbital excited meson mass spectra in the solvable potential model of two-body Dirac equation

2014 ◽  
Vol 29 ◽  
pp. 1460246 ◽  
Author(s):  
Jun-Kang He ◽  
Yue Li ◽  
Hong Chen
Keyword(s):  
Dirac Equation ◽  
Mass Spectra ◽  
Potential Model ◽  
Solvable Model ◽  
Heavy Meson ◽  
Meson Mass ◽  
Angular Structure ◽  
Complex Spin ◽  
Meson States ◽  
Coulomb Potentials

The meson mass spectra are obtained by solving exactly the two-body Dirac equation for the linear plus Coulomb potentials with complex spin-angular structure. In such a solvable model, the orbital excited heavy meson states as well as the orbital light meson states agree well with available experimental data. It turns out that the quark-antiquark interaction potential may be more intricate than those predicted so far.

scholarly journals An approach to the instanton effect in B system

2018 ◽  
Vol 33 (02) ◽  
pp. 1850017
Author(s):  
Noriaki Kitazawa ◽  
Yuki Sakai
Keyword(s):  
Mass Spectrum ◽  
Chiral Symmetry Breaking ◽  
Light Quark ◽  
Heavy Meson ◽  
Effective Theory ◽  
Meson Mass ◽  
Quark Masses ◽  
Quark Interaction ◽  
Up Quark ◽  
Instanton Effect

We discuss the constraint on the size of QCD instanton effects in low-energy effective theory. Among various instanton effects in meson mass spectrum and dynamics, we concentrate on the instanton-induced masses of light quarks. The famous instanton-induced six-quark interaction, so-called ’t Hooft vertex, could give nonperturbative quantum corrections to light quark masses. Many works have already been achieved to constrain the mass corrections in light meson system, or the system of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], and now we know for a fact that the instanton-induced mass of up-quark is too small to realize the solution of the strong CP problem by vanishing current mass of up-quark. In this work, we give a constraint on the instanton-induced mass correction to light quarks from the mass spectrum of heavy mesons, [Formula: see text], [Formula: see text], [Formula: see text] and their antiparticles. To accomplish this, the complete second-order chiral symmetry breaking terms are identified in heavy meson effective theory. We find that the strength of the constraint from heavy meson masses is at the same level of that from light mesons, and it would be made even stronger by more precise data from future [Formula: see text] factories and lattice calculations.

Correlations between the baryon and meson mass spectra

1992 ◽  
Vol 13 (3) ◽  
pp. 105-115 ◽  
Author(s):  
A. Gonzalez
Keyword(s):  
Mass Spectra ◽  
Meson Mass

scholarly journals ASYMMETRY OF IN-MEDIUM ρ-MESONS AS A SIGNATURE OF CHERENKOV EFFECTS

2009 ◽  
Vol 24 (06) ◽  
pp. 1221-1228 ◽  
Author(s):  
I. M. DREMIN ◽  
V. A. NECHITAILO
Keyword(s):  
Mass Spectra ◽  
Meson Mass ◽  
Low Mass ◽  
The Asymmetry

Cherenkov gluons may be responsible for the asymmetry of dilepton mass spectra near ρ-meson observed in experiment. They can be in charge only for dileptons in the low-mass wing of the resonance. Therefore the dilepton mass spectra are flattened there and their peak is slightly shifted to lower masses compared with the in-vacuum ρ-meson mass. This feature must be common for all resonances.

scholarly journals Meson Mass Spectra Based on a Bilocal Model

1979 ◽  
Vol 61 (3) ◽  
pp. 973-975
Author(s):  
S. Kojima
Keyword(s):  
Mass Spectra ◽  
Meson Mass

Meson mass spectra in the quark-string model

1978 ◽  
Vol 73 (2) ◽  
pp. 214-218 ◽  
Author(s):  
K. Kikkawa ◽  
Tsuneyuki Kotani ◽  
Masa-aki Sato
Keyword(s):  
Mass Spectra ◽  
String Model ◽  
Meson Mass

MEDIUM MODIFICATIONS OF LIGHT VECTOR MESONS IN PHOTOPRODUCTION REACTIONS AT JLAB

2009 ◽  
Vol 24 (02n03) ◽  
pp. 309-316
Author(s):  
◽  
M. H. WOOD ◽  
C. DJALALI ◽  
R. NASSERIPOUR ◽  
D. WEYGAND
Keyword(s):  
Mass Spectrum ◽  
Nuclear Matter ◽  
Mass Spectra ◽  
Decay Channel ◽  
Theoretical Calculations ◽  
Meson Mass ◽  
Vector Mesons ◽  
Small Shift ◽  
Light Vector ◽  
Dense Nuclear Matter

Theoretical calculations predict the modification of properties of vector mesons, such as a shift in their masses and/or broadening of their widths in dense nuclear matter. These effects can be related to partial restoration of chiral symmetry at high density or temperature. The light vector mesons (ρ, ω, and ϕ) were photo-produced on 2 H , C , Ti , Fe , and Pb targets at the Thomas Jefferson National Laboratory using the CEBAF Large Acceptance Spectrometer (CLAS). The data were taken with a beam of tagged photons with energies up to 4 GeV. The properties of the ρ vector meson at normal nuclear densities and zero temperature,were investigated via their rare leptonic decay to e+e-. This decay channel is preferred over hadronic modes in order to eliminate final state interactions in the nuclear matter. A combinatorial background was subtracted from the invariant mass spectra using a well-established event-mixing technique. The ρ meson mass spectrum was extracted after the ω and ϕ signals were removed in a nearly model-independent way. The rho meson mass distributions were extracted for each of the targets. Comparisons were made between the ρ mass spectra from the heavy targets ( A > 2) with the mass spectrum extracted from the deuterium target. With respect to the ρ-meson mass, we obtain a small shift compatible with zero. Also, we measure widths consistent with standard nuclear many-body effects such as collisional broadening and Fermi motion. In this experiment, due to the long lifetimes and momenta greater than 0.8 GeV, the ω and ϕ mesons have a high probability of decaying outside the nucleus in their vacuum state. However, their in-medium widths can be accessed through their absorption inside the nucleus. Preliminary results on the ratios of the nuclear transparencies of the ω and ϕ mesons as a function of the number of target nucleons A, have been obtained and indicate a substantial widening in the medium.

scholarly journals Study on the Applicability of Varshni Potential to Predict the Mass Spectra of the Quark-Antiquark Systems in a Non-relativistic Framework

2021 ◽  
Vol 14 (4) ◽  
pp. 339-347
Keyword(s):  
Schrödinger Equation ◽  
Schrodinger Equation ◽  
Mass Spectra ◽  
Laguerre Polynomials ◽  
Heavy Meson ◽  
Energy Eigenvalues ◽  
Relativistic Regime ◽  
Uvarov Method ◽  
Relativistic Framework ◽  
Good Agreement

Abstract: In this work, we obtain the Schrödinger equation solutions for the Varshni potential using the Nikiforov-Uvarov method. The energy eigenvalues are obtained in non-relativistic regime. The corresponding eigenfunction is obtained in terms of Laguerre polynomials. We applied the present results to calculate heavy-meson masses of charmonium cc ¯ and bottomonium bb ¯. The mass spectra for charmonium and bottomonium multiplets have been predicted numerically. The results are in good agreement with experimental data and the works of other researchers. Keywords: Schrödinger equation, Varshni potential, Nikiforov-Uvarov method, Heavy meson. PACs: 14.20.Lq; 03.65.-w; 14.40.Pq; 11.80.Fv.

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