We update Jaffe’s estimate of the strange isoscalar radius and magnetic moment of the nucleon. We make use of a recent dispersion–theoretical fit to the nucleon electromagnetic form factors and an improved description of symmetry breaking in the vector nonet. We find µs = −0.24 ± 0.03 n.m. and r2

EPJ manuscript No. (will be inserted by the editor) η Photoproduction off the nucleon revisited: Evidence for a narrow N(1688) resonance?

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At temperatures less than a few MeV, the efficiency of the neutrino-pair bremsstrahlung from nucleons interracting with the condensed pion field is much less than previously estimated by other authors. The physical reason for this is a periodic structure of the developed pion condensate

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The in-medium behavior of the nucleon spectral density including self-energies is revisited within the framework of QCD sum rules. Special emphasis is given to the density dependence of four-quark condensates. A complete catalog of four-quark condensates is presented and relations among them

the role of different effects: relativistic corrections, confinement, hyperfine forces, etc. It is conjectured that an additional interaction rescaled from the nucleon–nucleon system and acting between light quarks only, can help in bringing extra, possibly required, binding in tetraquarks. 1

We calculate isospin breaking in pion–nucleon scattering in the threshold region in the framework of covariant baryon chiral perturbation theory. All effects due to quark mass differences as well as real and virtual photons are consistently included. As an application, we discuss the energy

for interactions violating time reversal (T-) invariance is an important part of studies of fundamental symmetries in nature. The main hopes for the extraction of nucleon-nucleon and quark-quark interactions violating fundamental symmetries emerge from the experiments with atoms and atomic nuclei, see the recent

Chiral dynamics of kaon-nucleon interactions, revisited