scholarly journals Analysis ofK+→e+νeγin light-front quark model and chiral perturbation theory of orderp6

2008 ◽  
Vol 77 (1) ◽  
Author(s):  
Chuan-Hung Chen ◽  
Chao-Qiang Geng ◽  
Chong-Chung Lih
Keyword(s):  
Perturbation Theory ◽  
Quark Model ◽  
Chiral Perturbation Theory ◽  
Light Front ◽  
Chiral Perturbation

DECAY SPECTRUM OF K+ → e+νeγ

2008 ◽  
Vol 23 (21) ◽  
pp. 3204-3208 ◽  
Author(s):  
C. H. CHEN ◽  
C. Q. GENG ◽  
C. C. LIH
Keyword(s):  
Perturbation Theory ◽  
Quark Model ◽  
Chiral Perturbation Theory ◽  
Form Factors ◽  
Light Front ◽  
Chiral Perturbation ◽  
Decay Spectrum

The form factors of the K+ → γ transition are studied in the light-front quark model and chiral perturbation theory of O(p6). The decay spectrum of K+ → e+νeγ, dominated by the structure dependent contribution, is illustrated in both models.

Light front Hamiltonian for boson form of QED (1 + 1) in Pauli–Villars regularization

2019 ◽  
Vol 34 (21) ◽  
pp. 1950113
Author(s):  
V. A. Franke ◽  
M. Yu. Malyshev ◽  
S. A. Paston ◽  
E. V. Prokhvatilov ◽  
M. I. Vyazovsky
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Chiral Condensate ◽  
Light Front ◽  
Coupling Constants ◽  
Hamiltonian Approach ◽  
Chiral Perturbation ◽  
Dimensional Models ◽  
Villars Regularization ◽  
Ultraviolet Regularization

Light front (LF) Hamiltonian for QED in [Formula: see text] dimensions is constructed using the boson form of this model with additional Pauli–Villars-type ultraviolet regularization. Perturbation theory, generated by this LF Hamiltonian, is proved to be equivalent to usual covariant chiral perturbation theory. The obtained LF Hamiltonian depends explicitly on chiral condensate parameters which enter in a form of some renormalization of coupling constants. The obtained results can be useful when one attempts to apply LF Hamiltonian approach for [Formula: see text]-dimensional models like QCD.

scholarly journals CP CONSERVED NONLEPTONIC K → πππ DECAYS IN THE CHIRAL QUARK MODEL

2006 ◽  
Vol 21 (18) ◽  
pp. 3699-3726
Author(s):  
E. I. LASHIN
Keyword(s):  
Perturbation Theory ◽  
Quark Model ◽  
Chiral Perturbation Theory ◽  
Quark Mass ◽  
Constituent Quark ◽  
Gluon Condensate ◽  
Chiral Quark Model ◽  
Chiral Perturbation ◽  
Loop Correction ◽  
Constituent Quark Mass

The CP conserved nonleptonic K → πππ decays are discussed within the chiral quark model, including chiral perturbation theory corrections. For the chiral loop correction, they are presented in a way to be more manageable and easier for use. Furthermore a new identity for the imaginary part of the chiral loop corrections is derived. All amplitudes are parametrized in terms of quark and gluon condensate and the constituent quark mass. The same values for these parameters that can be obtained by a fit of the ΔI = 1/2 rule in K → 2π give a reasonably good fit in the K → 3π case. We compare with the work of other groups.

scholarly journals The axion-baryon coupling in SU(3) heavy baryon chiral perturbation theory

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Thomas Vonk ◽  
Feng-Kun Guo ◽  
Ulf-G. Meißner
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Heavy Baryon ◽  
Power Counting ◽  
Flavor Symmetry ◽  
Chiral Perturbation ◽  
Third Order ◽  
Stellar Objects ◽  
The Past ◽  
Dense Nuclear Matter

Abstract In the past, the axion-nucleon coupling has been calculated in the framework of SU(2) heavy baryon chiral perturbation theory up to third order in the chiral power counting. Here, we extend these earlier studies to the case of heavy baryon chiral perturbation theory with SU(3) flavor symmetry and derive the axion coupling to the full SU(3) baryon octet, showing that the axion also significantly couples to hyperons. As studies on dense nuclear matter suggest the possible existence of hyperons in stellar objects such as neutron stars, our results should have phenomenological implications related to the so-called axion window.

scholarly journals K0 → π0γγ decays in chiral perturbation theory

1987 ◽  
Vol 189 (3) ◽  
pp. 363-368 ◽  
Author(s):  
Gerhard Ecker ◽  
Antonio Pich ◽  
Eduardo De Rafael
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Chiral Perturbation
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