scholarly journals The upper energy limit of Heavy Baryon Chiral Perturbation Theory in pion photoproduction

2013 ◽  
Author(s):  
César Fernandez Ramirez
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Heavy Baryon ◽  
Pion Photoproduction ◽  
Energy Limit ◽  
Chiral Perturbation

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 Radiative pion photoproduction in covariant chiral perturbation theory

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
J. Rijneveen ◽  
N. Rijneveen ◽  
H. Krebs ◽  
A. M. Gasparyan ◽  
E. Epelbaum
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Pion Photoproduction ◽  
Chiral Perturbation
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