An independent-quark model calculation for radiative decay widths of mesons in static and beyond static approximation

2010 ◽  
Vol 88 (7) ◽  
pp. 517-527 ◽  
Author(s):  
S. N. Jena ◽  
H. H. Muni ◽  
P. K. Mohapatra ◽  
P. Panda
Keyword(s):  
Radiative Decay ◽  
Photon Emission ◽  
Decay Rates ◽  
Static Approximation ◽  
Radiative Transitions ◽  
Model Predictions ◽  
Decay Widths ◽  
Experimental Values ◽  
Conventional Picture ◽  
Good Agreement

We perform a static calculation of decay widths for radiative transitions of mesons within the conventional picture of photon emission by a confined quark and (or) antiquark. As the calculation based on the moderate momentum transfer allows some amount of uncertainty to creep into the model predictions, we further apply the model for a more realistic calculation beyond the static approximation, taking into account some momentum-dependent effects due to the recoil of the daughter meson. The results obtained for the decay widths of radiative transitions of light mesons are improved and are in good agreement with the experimental values. The predictions on the decay rates of heavy mesons are also affected and are comparable with those of other model predictions.

Chiral particle/Photon emission from heavy-light mesons

2014 ◽  
Vol 29 ◽  
pp. 1460239
Author(s):  
Takayuki Matsuki ◽  
Kohichi Seo
Keyword(s):  
Radiative Decay ◽  
Potential Model ◽  
Lorentz Invariance ◽  
Photon Emission ◽  
Wave Functions ◽  
Relativistic Wave ◽  
Decay Widths ◽  
Light Mesons ◽  
Relativistic Potential

Partial decay widths of the heavy-light mesons, D, Ds, B, and Bs, emitting one chiral particle (π or K) or photon γ are evaluated in the framework of a relativistic potential model. Decay amplitudes are calculated by keeping the Lorentz invariance as far as possible and use has been made of the Lorentz-boosted relativistic wave functions of the heavy-light mesons. One of predictions of our calculation is very narrow widths of a few keV for yet undiscovered Bs(0+, 1+) mesons corresponding to 2S+1LJ = 3P0 and "3P1" assuming their masses to be 5617 and 5682 MeV, respectively, as calculated in our former paper. Sizable radiative decay widths of D* or [Formula: see text] are obtained by including the 1st order corrections in 1/mQ expansion, in the unit of keV; Γ(D*0 → D0 + γ) = 9.8, Γ (D*+ → D+ + γ) = 0.71, [Formula: see text] and large radiative decay widths of DsJ are obtained compared with non-relativistic results.

An Investigation of the Squeeze Film Between Rotating Annuli

1970 ◽  
Vol 92 (3) ◽  
pp. 435-440 ◽  
Author(s):  
C. W. Allen ◽  
A. A. McKillop
Keyword(s):  
Experimental Investigation ◽  
Melting Point ◽  
Liquid Metal ◽  
Decay Rates ◽  
Squeeze Film ◽  
Centrifugal Effect ◽  
Experimental Values ◽  
Free Falling ◽  
Air Film ◽  
Good Agreement

The squeeze film between two plane annuli is examined theoretically and experimentally. The theoretical analysis considers the inertia due to the “centrifugal effect” but neglects all other inertia terms. The experimental investigation is by means of a free-falling spinning rotor which is decelerated by the squeeze film. Fluids examined are kerosene, SAE 10 oil, and a low melting point liquid metal. Good agreement between the predicted and actual decay rates is obtained for kerosene but that for the oil and liquid metal is only fair. The theoretical and experimental values of film thickness are in good agreement. The results for the liquid metal suggest the possibility of a thin air film between the rotor and the liquid metal.

scholarly journals ANALYSIS OF THE RADIATIVE DECAYS AMONG THE BOTTOMONIUM STATES

2012 ◽  
Vol 27 (34) ◽  
pp. 1250197 ◽  
Author(s):  
ZHI-GANG WANG
Keyword(s):  
Experimental Data ◽  
Systematic Study ◽  
Radiative Decay ◽  
Radiative Decays ◽  
Heavy Quarkonium ◽  
Radiative Transitions ◽  
Decay Widths ◽  
The Future

In this paper, we perform an systematic study of the radiative transitions among the bottomonium states using the heavy quarkonium effective Lagrangians, and make predictions for the ratios among the radiative decay widths of a special multiplet to another multiplet. The predictions can be confronted with the experimental data in the future.

Radiative decay of unbound levels in 14N

1985 ◽  
Vol 63 (9) ◽  
pp. 1141-1147 ◽  
Author(s):  
C. Pruneau ◽  
M. B. Chatterjee ◽  
C. Rangacharyulu ◽  
C. St-Pierre
Keyword(s):  
Shell Model ◽  
Radiative Decay ◽  
Branching Ratios ◽  
Gamma Transition ◽  
Model Calculations ◽  
Mixing Ratios ◽  
Decay Properties ◽  
Decay Widths ◽  
Gamma Decay ◽  
Good Agreement

The gamma decay properties of 10.43-, 10.1-, 9.7-, 9.51-, and 8.91-MeV levels are studied by the 13C(p, γ) reaction. The natural widths, gamma decay widths, branching ratios, and multipole mixing ratios are determined. The gamma branching ratios are generally in good agreement with earlier works. However, it is found that the previous (p, γ) measurements overestimated the gamma transition strengths. The results are compared with shell model calculations. Also, a phenomenological description is attempted for a few 14N levels.

RADIATIVE M1-TRANSITIONS OF HEAVY MESONS IN LIGHT-FRONT QUARK MODEL

2008 ◽  
Vol 23 (21) ◽  
pp. 3259-3262
Author(s):  
HO-MEOYNG CHOI
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Quark Model ◽  
Radiative Decay ◽  
Light Front ◽  
Effective Hamiltonian ◽  
Model Calculations ◽  
Heavy Mesons ◽  
Decay Widths ◽  
Good Agreement

We present the magnetic dipole(M1) transitions V → Pγ of various heavy-flavored mesons such as [Formula: see text] and [Formula: see text] using the light-front quark model constrained by the variational principle for the QCD-motivated effective Hamiltonian. Our numerical results for the radiative decay widths are in good agreement with the available experimental data as well as other theoretical model calculations.

Cadmium salts transport through a nanofiltration membrane: experimental results and model predictions

1998 ◽  
Vol 38 (4-5) ◽  
pp. 529-535
Author(s):  
Y. Garba ◽  
S. Taha ◽  
N. Gondrexon ◽  
G. Dorange
Keyword(s):  
Transport Mechanism ◽  
Film Theory ◽  
Nanofiltration Membrane ◽  
Permeate Flux ◽  
Transport Parameters ◽  
Model Predictions ◽  
Experimental Values ◽  
Effective Transfer ◽  
Cadmium Salt ◽  
Good Agreement

This article discusses the transport mechanism of cadmium salts (CdCl2, Cd(NO3)2) through a nanofiltration membrane. A model based on the extended Nernst-Planck and the film theory equations is reported. This model is characterized by three transport parameters: the water permeability Lp, the ion transmittance Φ and the effective transfer coefficient Keff. The knowledge of the feed and permeate concentrations and the permeate flux enable the calculation of these parameters. The model was used to predict cadmium salt solution rejection by a NANOMAX 50 membrane. The experimental values and calculated predictions are in good agreement.

M1 TRANSITIONS OF MESONS IN A POTENTIAL MODEL OF INDEPENDENT QUARKS

2010 ◽  
Vol 25 (10) ◽  
pp. 2063-2086 ◽  
Author(s):  
S. N. JENA ◽  
M. K. MUNI ◽  
H. R. PATTNAIK ◽  
K. P. SAHU
Keyword(s):  
Ground State ◽  
Potential Model ◽  
Decay Rates ◽  
Momentum Dependence ◽  
Model Calculations ◽  
Static Approximation ◽  
Heavy Mesons ◽  
Decay Widths ◽  
Light Mesons ◽  
Relativistic Potential

The decay widths for M1 transitions of mesons are calculated in a relativistic potential model of independent quarks with its parameters determined from a fit to the mass splittings of the ground state mesons in the strange, charm and bottom flavor sector. A more realistic calculation of the decay widths is performed beyond static approximation incorporating some momentum dependence due to recoil of the daughter meson. The model accounts well for the observed decay widths of light mesons and predicts decay rates of heavy mesons which are comparable with those of other model calculations.

Systematic calculations of energy levels and transitions rates in Mo XXVIII

2020 ◽  
Vol 75 (8) ◽  
pp. 739-747
Author(s):  
Feng Hu ◽  
Yan Sun ◽  
Maofei Mei
Keyword(s):  
Energy Levels ◽  
Oscillator Strengths ◽  
Atomic Data ◽  
Data Sets ◽  
Electron Systems ◽  
Excitation Energies ◽  
Experimental Values ◽  
Qed Effects ◽  
Hyperfine Structures ◽  
Good Agreement

AbstractComplete and consistent atomic data, including excitation energies, lifetimes, wavelengths, hyperfine structures, Landé gJ-factors and E1, E2, M1, and M2 line strengths, oscillator strengths, transitions rates are reported for the low-lying 41 levels of Mo XXVIII, belonging to the n = 3 states (1s22s22p6)3s23p3, 3s3p4, and 3s23p23d. High-accuracy calculations have been performed as benchmarks in the request for accurate treatments of relativity, electron correlation, and quantum electrodynamic (QED) effects in multi-valence-electron systems. Comparisons are made between the present two data sets, as well as with the experimental results and the experimentally compiled energy values of the National Institute for Standards and Technology wherever available. The calculated values including core-valence correction are found to be in a good agreement with other theoretical and experimental values. The present results are accurate enough for identification and deblending of emission lines involving the n = 3 levels, and are also useful for modeling and diagnosing plasmas.

Radiative decay rates in LaF3:Dy3+

1979 ◽  
Vol 63 (1) ◽  
pp. 90-92 ◽  
Author(s):  
H. Jagannath ◽  
A. Sivaram ◽  
D. Ramachandra Rao ◽  
P. Venkateswarlu
Keyword(s):  
Radiative Decay ◽  
Decay Rates
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