Z' indication from new APV data in Cesium and searches at linear colliders

New data on parity violation in atomic cesium can be explained by a new neutral vector boson almost unmixed with Z, with a mass in the TeV range and sizeable couplings to the fermions. The properties of such additional Z' can be investigated at future linear colliders.Comment: 10 pages, 6 figures, Proceedings of the Second ECFA/DESY Study on Physics and Detectors for a Linear Electron - Positron Collide

Time delay is a common feature of quantum scattering theory

We prove that the existence of time delay defined in terms of sojourn times, as well as its identity with Eisenbud-Wigner time delay, is a common feature of two Hilbert space quantum scattering theory. All statements are model-independent.Comment: 15 page

New expressions for the wave operators of Schroedinger operators in R^3

We prove new and explicit formulas for the wave operators of Schroedinger operators in R^3. These formulas put into light the very special role played by the generator of dilations and validate the topological approach of Levinson's theorem introduced in a previous publication. Our results hold for general (not spherically symmetric) potentials decaying fast enough at infinity, without any assumption on the absence of eigenvalue or resonance at 0-energy.Comment: 11 page