scholarly journals Charge symmetry breaking inNNscattering with an interaction from effective field theory

2002 ◽  
Vol 65 (3) ◽  
Author(s):  
J. A. Niskanen
Keyword(s):  
Field Theory ◽  
Symmetry Breaking ◽  
Effective Field Theory ◽  
Effective Field ◽  
Charge Symmetry Breaking ◽  
Charge Symmetry

CHIRAL EFFECTIVE POTENTIAL WITH DELTA DEGREES OF FREEDOM

2009 ◽  
Vol 24 (02n03) ◽  
pp. 511-514
Author(s):  
H. KREBS ◽  
E. EPELBAUM ◽  
ULF-G. MEIßNER
Keyword(s):  
Effective Field Theory ◽  
Degrees Of Freedom ◽  
Effective Field ◽  
Chiral Expansion ◽  
Leading Order ◽  
Nuclear Forces ◽  
Charge Symmetry Breaking ◽  
Chiral Effective Field Theory ◽  
Charge Symmetry ◽  
Full Theory

Using chiral effective field theory (EFT) with explicit Δ degrees of freedom we calculated nuclear forces up to next-to-next-to-leading order (NNLO). We found much better convergence of the chiral expansion in all peripheral partial waves. We also observe strong cancellations between charge-symmetry-breaking (CSB) contributions due to nucleon- and Δ-mass splittings in the two-pion-exchange potentials. The CSB potentials appear to be weaker in the Δ-full theory.

scholarly journals Effective field theory for spacetime symmetry breaking

2015 ◽  
Vol 92 (4) ◽  
Author(s):  
Yoshimasa Hidaka ◽  
Toshifumi Noumi ◽  
Gary Shiu
Keyword(s):  
Field Theory ◽  
Symmetry Breaking ◽  
Effective Field Theory ◽  
Effective Field ◽  
Spacetime Symmetry

scholarly journals Effective field theory calculations of NN → NNπ

2014 ◽  
Vol 23 (04) ◽  
pp. 1430004 ◽  
Author(s):  
Vadim Baru ◽  
Christoph Hanhart ◽  
Fred Myhrer
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Pion Production ◽  
Mass Difference ◽  
Effective Field ◽  
S Wave ◽  
Chiral Effective Field Theory ◽  
Charge Symmetry ◽  
Pion Nucleon ◽  
Scattering Lengths

In this review, we present the recent advances for calculations of the reactions NN → NNπ using chiral effective field theory χEFT. Discussed are the next-to-next-to leading order (N2LO) loop contributions with nucleon and Delta-isobar for near threshold s-wave pion-production. Results of recent experimental pion-production data for energies close to the threshold are analyzed. Several particular applications are discussed: (i) it is shown how the measured charge symmetry (CS) violating pion-production reaction can be used to extract the strong interaction contribution to the proton–neutron mass difference; (ii) the role of NN → NNπ for the extraction of the pion–nucleon scattering lengths from pionic atoms data is illuminated.

scholarly journals SPECTRUM AND DECAYS OF HADRONIC ATOMS

2005 ◽  
Vol 20 (02n03) ◽  
pp. 358-364 ◽  
Author(s):  
JULIA SCHWEIZER
Keyword(s):  
Field Theory ◽  
Symmetry Breaking ◽  
Effective Field Theory ◽  
Ground State ◽  
Effective Field ◽  
Isospin Symmetry ◽  
Leading Order ◽  
Isospin Symmetry Breaking ◽  
Hadronic Atoms

We describe the spectra and decays of π+π-and π±K∓atoms within a non-relativistic effective field theory. The evaluations of the energy shifts and widths are performed at next-to-leading order in isospin symmetry breaking. The prediction for the lifetime of the π±K∓atom in its ground-state yields τ10=(3.7±0.4)·10-15s .

COMMENTS ON HIERARCHICAL SYMMETRY BREAKING IN EFFECTTVE THEORY OF CALABI-YAU COMPACTIFIED SUPERSTRING

1990 ◽  
Vol 05 (23) ◽  
pp. 1901-1908
Author(s):  
DAIJIRO SUEMATSU
Keyword(s):  
Field Theory ◽  
Symmetry Breaking ◽  
Effective Field Theory ◽  
Radiative Correction ◽  
Effective Field ◽  
Large Hierarchy ◽  
Chiral Superfields

We re-examine the possibility of large hierarchical symmetry breaking in the effective field theory of Calabi-Yau compactified superstring. We introduce the general superpotential containing the allowed moduli couplings. In certain manifolds one-loop radiative correction gives the non-trivial minimum and that solution suggests the possibility of large hierarchical symmetry breaking. To realize such a large hierarchy, it seems to require that 27(h2,1 + h1,1) > 48π2 and H1 ( End T) chiral superfields should have certain types of couplings to moduli fields.

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