scholarly journals Matching chiral perturbation theory and the dispersive representation of the scalar Kπ form factor

2008 ◽  
Vol 661 (2-3) ◽  
pp. 95-102 ◽  
Author(s):  
Véronique Bernard ◽  
Emilie Passemar
Keyword(s):  
Perturbation Theory ◽  
Form Factor ◽  
Chiral Perturbation Theory ◽  
Chiral Perturbation ◽  
Dispersive Representation

scholarly journals Taylor's Series and Dispersion Relation Analyses of the Vector Pion Form Factor and their Comparison with Perturbative and Non Perturbative Calculations

2015 ◽  
Vol 25 (1) ◽  
pp. 21
Author(s):  
Truong Nguyen Tran
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Form Factor ◽  
Dispersion Relation ◽  
Momentum Transfer ◽  
Chiral Perturbation Theory ◽  
Pion Form Factor ◽  
P Wave ◽  
Chiral Perturbation ◽  
Taylor’S Series

The first three coefficients of the Taylor's series expansion of the vevtor pion form factor as a function of the momentum transfer are evaluated using the experimental data on the pion form factor and the P-wave \(\pi\pi\) phase shifts. The real part of the form factor as a function of energy is also calculated by dispersion relation. Comparisons there results with Chiral Perturbation Theory and unitarized models are given.

scholarly journals The electric dipole form factor of the nucleon in chiral perturbation theory to sub-leading order

2011 ◽  
Vol 696 (1-2) ◽  
pp. 97-102 ◽  
Author(s):  
E. Mereghetti ◽  
J. de Vries ◽  
W.H. Hockings ◽  
C.M. Maekawa ◽  
U. van Kolck
Keyword(s):  
Perturbation Theory ◽  
Form Factor ◽  
Chiral Perturbation Theory ◽  
Electric Dipole ◽  
Leading Order ◽  
Chiral Perturbation ◽  
Dipole Form Factor ◽  
Dipole Form

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.

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