Threshold πN Isospin Violation (Hadron properties and chiral symmetry in medium, Chiral dynamics in nuclear medium, New Frontiers in QCD-Exotic Hadrons and Hadronic Matter-)
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概要
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We discuss the electromagnetic corrections to the πN scattering lengths generated by minimal e. m. coupling from a knowledge of the low energy expansion of the πN elastic scattering amplitude as well as from the nucleon and Δ pole terms, all taken for purely strong interactions. In the heavy baryon limit there is no free parameter, since masses and the e. m. and axial form factors are known. The different terms have a clear physical and intuitive origin. In particular, a large isospin breaking contribution to the isoscalar term appears in the elastic charged-pion scattering lengths. We attempt a comparison to the results from chiral effective field theory (EFT) with a physical interpretation of the empirical constants in that approach. The results are applied to the energy shift and width of the π^-p atom.
- 理論物理学刊行会の論文
- 2007-11-09
著者
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Loiseau Benoit
Laboratoire De Physique Nucleaire Et De Hautes Energies Unite De Recherche Des Universites Paris 6 E
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ERICSON Torleif
Theory Unit, Physics Department, CERN
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IVANOV Andrei
Atomic Institute of the Austrian Universities, Vienna University of Technology
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WYCECH Slawek
Soltan Institute for Nuclear Studies
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Ericson Torleif
Theory Unit Physics Department Cern
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Ivanov Andrei
Atomic Institute Of The Austrian Universities Vienna University Of Technology:smi Of The Austrian Ac
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IVANOV Andrei
Atomic Institute of the Austrian Universities, Vienna University of Technology:SMI of the Austrian Academy of Sciences
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LOISEAU Benoit
Laboratoire de Physique Nucleaire et de Hautes Energies, Unite de Recherche des Universites Paris 6 et Paris 7, associee au CNRS, Groupe Theorie, Univ. P. & M. Curie