Isospin violation in the {pi}N system at low energies
- Institute for Particle Physics, ETH Zurich, CH-5232 Villigen PSI (Switzerland)
The low-energy {pi}N interaction is investigated with the use of a relativistic isospin-symmetric {pi}N model based on scalar-isoscalar and vector-isovector exchanges in the t channel, and the nucleon and {Delta}-isobar contributions in the s and u channels; the small contributions from the well-established s and p higher (baryon) resonances are also taken into account. In the region of elasticity, the model provides a firm basis for analyzing the experimental data. The analysis of all (recent {ital and} old) {pi}N measurements between (pion laboratory kinetic energy of) 20 and 100 MeV has been achieved with the implementation of robust statistics. Provided the correctness of the bulk of the experimental data and the completeness of the electromagnetic corrections applied to the scattering problem, this work provides overwhelming evidence for isospin-symmetry breaking of the strong interaction in the {pi}N system. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 550599
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 56; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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