scholarly journals Higher moments of nucleon spin structure functions in heavy baryon chiral perturbation theory and in a resonance model

2004 ◽  
Vol 69 (5) ◽  
Author(s):  
Chung-Wen Kao ◽  
D. Drechsel ◽  
S. Kamalov ◽  
M. Vanderhaeghen
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Spin Structure ◽  
Heavy Baryon ◽  
Structure Functions ◽  
Higher Moments ◽  
Nucleon Spin ◽  
Chiral Perturbation ◽  
Resonance Model ◽  
Nucleon Spin Structure

Nucleon Spin Polarizabilities in Heavy Baryon Chiral Perturbation Theory

2009 ◽  
Author(s):  
Chung Wen Kao ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
Simonetta Liuti ◽  
...  
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Heavy Baryon ◽  
Nucleon Spin ◽  
Chiral Perturbation

scholarly journals NEW PREDICTIONS OF GENERALIZED SPIN POLARIZABILITIES IN HEAVY BARYON CHIRAL PERTURBATION THEORY

2006 ◽  
Vol 21 (10) ◽  
pp. 2027-2148 ◽  
Author(s):  
CHUNG-WEN KAO
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Spin Structure ◽  
Sum Rules ◽  
Heavy Baryon ◽  
Virtual Compton Scattering ◽  
Leading Order ◽  
Chiral Perturbation ◽  
Theoretical Understanding ◽  
Existing Data

We review the recent progress of the theoretical understanding of the spin structure of the nucleon based on Heavy Baryon Chiral Perturbation Theory (HBChPT). At low Q2 the spin structure of the nucleon is encoded into the generalized spin polarizabilities (spin GP's) extracted from the virtual Compton scattering (VCS) amplitudes. The spin GP's of the nucleon have been calculated up to next-to-leading order in HBChPT. Furthermore, the forward spin generalized polarizabilities, which are related to the nucleon polarized structure functions g1 and g2 through the sum rules based on dispersion relations, also have been calculated in HBChPT up to next-to-leading order. As a summary, the physics content of the existing data is discussed and some perspectives for future theoretical and experimental activities in this field are also presented.

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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