Low-energy expansion of the radiative pion decay amplitude

1980 ◽  
Vol 27 (10) ◽  
pp. 318-320
Author(s):  
A -M. M. Abdel-Rahmax
Keyword(s):  
Decay Amplitude ◽  
Low Energy ◽  
Pion Decay ◽  
Energy Expansion

scholarly journals Low-energy expansion of the pion-nucleon Lagrangian

1996 ◽  
Vol 365 (1-4) ◽  
pp. 312-318 ◽  
Author(s):  
G. Ecker ◽  
M. Mojžiš
Keyword(s):  
Low Energy ◽  
Pion Nucleon ◽  
Energy Expansion

scholarly journals Low-energy expansion of the one-loop type-II superstring amplitude

2000 ◽  
Vol 61 (10) ◽  
Author(s):  
Michael B. Green ◽  
Pierre Vanhove
Keyword(s):  
Low Energy ◽  
Type Ii ◽  
The One ◽  
Energy Expansion

Kℓ4 decays and the low-energy expansion

1990 ◽  
Vol 337 (3) ◽  
pp. 635-651 ◽  
Author(s):  
Johan Bijnens
Keyword(s):  
Low Energy ◽  
Energy Expansion

Some analytic properties of three-pion decay amplitudes

1962 ◽  
Vol 266 (1324) ◽  
pp. 68-83 ◽  
Keyword(s):  
Dispersion Relation ◽  
Spectral Function ◽  
Decay Amplitude ◽  
Dispersion Relations ◽  
Pion Decay ◽  
Physical Domain ◽  
Physical Sheet ◽  
Double Dispersion ◽  
Double Spectral Function

It is shown for all graphs of the ‘strip approximation’ that the K ->3n decay amplitude obeys a Mandelstam double-dispersion relation. The double spectral function turns out to be complex and covers the whole physical domain, so that the Cini-Fubini approximation is no longer valid. Essential singularities are found on the border of the physical sheet. Double-dispersion relations in one energy and in the K mass are also derived.

THE $K_L^0\to \pi ^0 \gamma \gamma$ DECAY IN CHIRAL PERTURBATION THEORY BASED ON THE EXTENDED NAMBU-JONA-LASINIO MODEL

1992 ◽  
Vol 07 (21) ◽  
pp. 5115-5129 ◽  
Author(s):  
ANDREI N. IVANOV
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Chiral Limit ◽  
Decay Amplitude ◽  
Low Energy ◽  
Chiral Perturbation ◽  
Photon Exchange ◽  
Two Photon ◽  
Energy Approximation ◽  
Gamma Decay

The [Formula: see text] decay is analyzed within chiral perturbation theory based on the extended Nambu-Jona-Lasinio model, which is used as a low energy approximation of QCD. The two-photon spectrum of the [Formula: see text] decay and the value of the probability [Formula: see text] are obtained in good agreement with experimental data. It is shown that the CP-conserving two-photon exchange contribution to the [Formula: see text] decay mplitude is negligibly small compared to that of the CP-violating one-photon exchange. Also presented is the derivation of the low-energy theorem for the [Formula: see text] decay amplitude in the chiral limit.

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