The photon bremsstrahlung correction to the differential cross-section and to the charge asymmetry \(A_{\rm FB}\) of \(e^+e^-\)-annihilation into two fermions has been integrated analytically over the complete photon phase space and is discussed in the context of the standard electroweak theory.
In the supersymmetric gauge theories the “non-renormalization” theorem guarantees that some quantities which are zero in lowest order remain zero in higher orders of perturbation theory. We show that such quantities get nonvanishing contributions from instanton-induced interactions. Also, no cut-off in the size of instantons is needed.
A new model for low-\(p_{\bot }\) hadron–hadron, hadron-nucleus and nucleus–nucleus collisions is presented together with a review of the Lund model for hadronization in quark and gluon jets.
