scholarly journals TWO PHOTON DECAYS OF SCALAR MESONS IN A COVARIANT QUARK MODEL

2000 ◽  
Vol 15 (01) ◽  
pp. 65-79 ◽  
Author(s):  
S. FAJFER ◽  
D. HORVATIĆ ◽  
D. TADIĆ ◽  
S. ŽGANEC
Keyword(s):  
Form Factors ◽  
Model Parameters ◽  
Current Form ◽  
Quark Masses ◽  
Scalar Mesons ◽  
Two Photon ◽  
Photon Decay ◽  
Covariant Model ◽  
Nonrelativistic Model ◽  
Decay Widths

Two photon decay widths of the JP = O+ scalar mesons a0(980), f0(980), f0(1370) and χc0 are calculated in a covariant model which is characterized by the quark–antiquark structure. Previously such models were used to calculate current form factors. Here a different application is tried. A simple version of the model uses adjusted nonrelativistic model parameters with small quark masses. The results seem to prefer nonideal mixing of f0(980) and f0(1370). The calculated decay rate of χc0 agrees with the experimental results.

scholarly journals Radiative decays of scalar mesons σ(600), f 0(980) and a 0(980) in the local Nambu-Jona-Lasinio model

Open Physics ◽  
2010 ◽  
Vol 8 (4) ◽  
Author(s):  
Mikhail Volkov ◽  
Eduard Kuraev ◽  
Yury Bystritskiy
Keyword(s):  
Experimental Data ◽  
Dominant Role ◽  
Radiative Decays ◽  
Loop Contribution ◽  
Hartree Fock ◽  
Scalar Mesons ◽  
Two Photon ◽  
Photon Decay ◽  
Decay Widths ◽  
Order Of Magnitude

AbstractThe two-photon decay widths of scalar mesons σ(600), f 0(980) and a 0(980) as well a 0 → ju(ω)γ and f 0 → ju(ω)γ are calculated in the framework of the local Nambu-Jona-Lasinio model. The contributions of the quark loops (Hartree-Fock approximation) and the meson loops (next 1/N c-approximation where N c is the number of colors) are taken into account. The values of these contributions, as we show, are of the same order of magnitude. For the f 0 decay the K-loop contribution plays the dominant role. The results for two-gamma decays are in satisfactory agreement with modern experimental data. The predictions for a 0 → ju(ω)γ and f 0 → ju(ω)γ widths are given.

Erratum: A Lattice Study of the Two-photon Decay Widths for Scalar and Pseudo-scalar Charmonium [Chinese Physics C Vol.44,No.8(2020)083108]

2022 ◽  
Author(s):  
Ying Chen ◽  
Ming Gong ◽  
Ning Li ◽  
Chuan 刘川 Liu ◽  
Yubin 刘玉斌 Liu ◽  
...  
Keyword(s):  
Decay Width ◽  
Two Photon ◽  
Photon Decay ◽  
Decay Widths ◽  
Pseudo Scalar

Abstract We have corrected the decay width for the two photon decay widths for scalar and pseudo-scalar Charmonium in [Chinese Physics C Vol.44,No.8(2020)083108]. The decay widths are now in better agreement with the experiment values.

scholarly journals Two-photon decay widths of Higgs bosons in minimal broken supersymmetry

1986 ◽  
Vol 34 (1) ◽  
pp. 172-181 ◽  
Author(s):  
R. Bates ◽  
John N. Ng ◽  
P. Kalyniak
Keyword(s):  
Higgs Bosons ◽  
Two Photon ◽  
Photon Decay ◽  
Decay Widths

scholarly journals Two-photon decay widths of Higgs particles

1993 ◽  
Vol 311 (1-4) ◽  
pp. 255-260 ◽  
Author(s):  
A. Djouadi ◽  
M. Spira ◽  
P.M. Zerwas
Keyword(s):  
Two Photon ◽  
Photon Decay ◽  
Decay Widths

LOCATION, CORRELATION, RADIATION: WHERE IS THE σ, WHAT IS ITS STRUCTURE, AND WHAT IS ITS COUPLING TO PHOTONS?

2007 ◽  
Vol 22 (20) ◽  
pp. 1439-1457 ◽  
Author(s):  
M. R. PENNINGTON
Keyword(s):  
Cross Sections ◽  
Complex Energy Plane ◽  
Model Expectation ◽  
Complex Energy ◽  
Radiative Coupling ◽  
Scalar Mesons ◽  
Two Photon ◽  
Photon Decay ◽  
Nonrelativistic Quark Model ◽  
Energy Plane

Scalar mesons are a key expression of the infrared regime of QCD. The lightest of these is the σ. Now that its pole in the complex energy plane has been precisely located, we can ask whether this state is transiently [Formula: see text] or [Formula: see text] or a multi-meson molecule or largely glue? The two-photon decay of the σ can, in principle, discriminate between these possibilities. We review here how the γγ → π+π-, π0π0 cross-sections can be accurately computed. The result not only agrees with experiment, but definitively fixes the radiative coupling of the σ. This equates to a two-photon width of (4.1 ± 0.3) keV, which accords with the simple nonrelativistic quark model expectation for a [Formula: see text], [Formula: see text] scalar. Nevertheless, robust predictions from relativistic strong coupling QCD are required for each of the possible compositions before we can be sure which one really delivers the determined γγ coupling.

scholarly journals Lattice study of two-photon decay widths for scalar and pseudo-scalar charmonium

2020 ◽  
Vol 44 (8) ◽  
pp. 083108
Author(s):  
Ying Chen ◽  
Ming Gong ◽  
Ning Li ◽  
Chuan Liu ◽  
Yu-Bin Liu ◽  
...  
Keyword(s):  
Two Photon ◽  
Photon Decay ◽  
Decay Widths ◽  
Pseudo Scalar
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