Two-photon widths from the Bethe–Salpeter wave function

1995 ◽  
Vol 73 (3-4) ◽  
pp. 138-142
Author(s):  
Ileana Guiasu ◽  
Roman Koniuk
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Simple Model ◽  
Quark Model ◽  
Two Photon ◽  
Model Wave Function ◽  
Nonrelativistic Quark Model ◽  
Model Predictions ◽  
Mass Dependent ◽  
Dependent Factor

Two-photon widths of pseudoscalar quarkonium are calculated using a Bethe–Salpeter wave function, recently proposed by Gromes. The results are compared to the standard, nonrelativistic quark-model predictions. The nonrelativistic quark model requires a phenomenological mass-dependent factor to bring its calculated pion width in agreement with the experimental data. We find that the Bethe–Salpeter approach, even using a very simple model wave function, gives results that are close to the experimental data for the pion and at the same time the successful nonrelativistic quark-model predictions for heavier systems are not disturbed.

scholarly journals TWO-PHOTON DECAY RATES OF HEAVY QUARKONIA IN THE RELATIVISTIC QUARK MODEL

2003 ◽  
Vol 18 (09) ◽  
pp. 601-607 ◽  
Author(s):  
D. EBERT ◽  
R. N. FAUSTOV ◽  
V. O. GALKIN
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Relativistic Effects ◽  
Decay Rates ◽  
Heavy Quarkonia ◽  
Radiative Corrections ◽  
Relativistic Quark Model ◽  
Two Photon ◽  
Photon Decay ◽  
Theoretical Predictions

Two-photon decay rates of pseudoscalar, scalar and tensor states of charmonium and bottomonium are calculated in the framework of the relativistic quark model. Both relativistic effects and one-loop radiative corrections are taken into account. The obtained results are compared with other theoretical predictions and available experimental data.

scholarly journals Study of baryon octet charge form factors in perturbative chiral quark model

2014 ◽  
Vol 29 ◽  
pp. 1460252
Author(s):  
X. Y. Liu ◽  
K. Khosonthongkee ◽  
A. Limphirat ◽  
Y. Yan
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Quark Model ◽  
Form Factors ◽  
Baryon Octet ◽  
Chiral Quark Model ◽  
Charge Form ◽  
Quark Wave Function ◽  
Theoretical Results ◽  
Good Agreement

The charge form factors of baryon octet are studied in the perturbative chiral quark model (PCQM). The relativistic quark wave function is extracted by fitting the theoretical results of the nucleon charge form factors to the experimental data and the predetermined quark wave function is applied to study the charge form factors of other octet baryons. The PCQM results are found, based on the predetermined quark wave function, in good agreement with the experimental data.

scholarly journals TOWARDS THE UNDERSTANDING OF THE MESON SPECTRA

2005 ◽  
Vol 20 (02n03) ◽  
pp. 622-624 ◽  
Author(s):  
J. VIJANDE ◽  
F. FERNÁNDEZ ◽  
A. VALCARCE
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Hadron Spectroscopy ◽  
Quark Interaction ◽  
Model Predictions ◽  
Complete Study

We present a quark-quark interaction for the complete study of the meson spectra, from the light to the heavy sector. We compare the quark model predictions against well-established [Formula: see text] experimental data. This allows to identify discrepancies between quark model results and experiment that may signal physics beyond conventional hadron spectroscopy.

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.

An independent quark model study of weak leptonic decays of pseudoscalar mesons

2015 ◽  
Vol 30 (16) ◽  
pp. 1550092
Author(s):  
S. N. Jena ◽  
P. K. Nanda ◽  
S. Sahoo ◽  
S. Panda
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Decay Constant ◽  
Model Parameters ◽  
Decay Modes ◽  
Leptonic Decays ◽  
Model Study ◽  
Pseudoscalar Mesons ◽  
Model Predictions ◽  
Decay Widths

An independent quark model with a relativistic power-law potential is used to study the weak leptonic decays of light and heavy pseudoscalar mesons. The partial decay width and the decay constant for the weak leptonic decay are derived from the quark–antiquark momentum distribution amplitude which is obtained from the bound quark eigenfunction with the assumption of a strong correlation existing between quark–antiquark momenta inside the decaying meson in its rest frame. The model parameters are first determined from the application of the model to study the ground state hyperfine splitting of ρ, K, D, Ds, B, Bs and Bc mesons. The same model with no adjustable parameters is then used to evaluate the decay constants fM and the decay widths of pseudoscalar mesons. The model predictions agree quite well with the available experimental data as well as with those of several other models. The decay constant for pion and kaon are obtained as fπ = 132 MeV and fk = 161 MeV which closely agree with experimental values. But in case of heavier mesons for which experimental data are not yet available, the present model gives its predictions as fBC > fBS > fB, fDS > fD, fD > fB and fπ > fB which are in conformity with most of other model predictions. The model predictions of the corresponding decay widths and the branching ratios for the [Formula: see text] and [Formula: see text] decay modes are in close agreement with the available experimental data.

The Tensile Property of the SPF/Cotton Blended Yarn

2011 ◽  
Vol 321 ◽  
pp. 192-195
Author(s):  
Qing Bin Yang ◽  
Xiao Yang
Keyword(s):  
Experimental Data ◽  
Simple Model ◽  
Tensile Property ◽  
Cotton Fibers ◽  
Blended Yarn ◽  
The Difference ◽  
The Relationship

In order to analysis the relationship between the strength and elongation and the blended ratio of SPF/Cotton blended yarn, the strength and elongation of SPF /cotton blended yarn with different blended ratio were measured and compared with the simple model. The results indicated that For the SPF/cotton blended yarn, the difference between the experimental data and the model value is remarkable because of the high cohesion of the cotton fibers.

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