Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 1 eps figure. Invited talk to appear in Proceedings of EXA05, Vienna, Feb. 21-25 2005, Verlag der oesterreichischen
Scientific paper
We discuss the electromagnetic corrections to the pion-nucleon scattering lengths generated by minimal e. m. coupling from a knowledge of the low energy expansion of the pion-nucleon elastic scattering amplitude as well as from the nucleon and delta pole terms, all a consequence of purely strong interactions. We assume the heavy baryon limit; the e.m. and axial form factors and the masses are used with their empirical values, such that there is no free parameter. The different terms have a clear physical and intuitive origin. In particular, a large isospin breaking contribution to the isoscalar term appears for 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 pionic hydrogen.
No associations
LandOfFree
Isospin Violation in Pion-Nucleon Scattering at Threshold does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Isospin Violation in Pion-Nucleon Scattering at Threshold, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isospin Violation in Pion-Nucleon Scattering at Threshold will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-613060