A class of models of multi-particle scattering and production amplitudes is constructed for which the S-matrix is exactly unitary at high energies. Two specific models are studied in detail. One leads to a constant total cross-section, the other to a logarithmically increasing one. Particle production in inclusive and exclusive experiments is considered for both models.

If one could predict the exact path that a photon, electron, or a-particle might follow and the energies these particles retain as they traverse different tissue regions of the body, one could calculate many useful quantities by averaging over a very large number of particle histories, defined as the total experience a particle undergoes from the time it is emitted to the time it is absorbed or...

A nuclear mass formula is constructed which is composed of two parts, one describing the general trend of the masses as a function of Z and N and the other representing deviations of individual masses from this general trend. These deviations are referred to as shell energies in a broad sense. The shell energies of spherical nuclei are calculated with use of a spherical single-particle potentia...

Mkn 421 was repeatedly observed with BeppoSAX in 1997–1998. The source showed a very rich phenomenology, with remarkable spectral variability. This is the second of two papers presenting the results of a thorough temporal and spectral analysis of all the data available to us, focusing in particular on the flare of April 1998, which was simultaneously observed also at TeV energies. The spectral ...

Citation Dabo, Ismaila. et al. "Koopmans' condition for density-functional theory. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. In approximate Kohn-Sham density...

We investigate the sensitivity of the semileptonic processes e+e− → l−ν̄l q q̄′, l = e or μ, on the non-standard trilinear gauge couplings, using the optimal observables method at Linear Collider energies. Our study is based on the four-fermion generator ERATO. Taking into account all possible correlations between the different trilinear gauge coupling parameters, we show that they can be measure...