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Full-Text Articles in Physics

Thermodynamics Of Integrable Chains With Alternating Spins, H. J. De Vega, Luca Mezincescu, Rafael I. Nepomechie Jan 1994

Thermodynamics Of Integrable Chains With Alternating Spins, H. J. De Vega, Luca Mezincescu, Rafael I. Nepomechie

Physics Articles and Papers

We consider a two-parameter (c¯,c̃) family of quantum integrable isotropic Hamiltonians for a chain of alternating spins of spin s=1/2 and s=1. We determine the thermodynamics for low-temperature T and small external magnetic field H, with T≪H. In the antiferromagnetic (c¯>0,c̃>0) case, the model has two gapless excitations. In particular, for c¯=c̃, the model is conformally invariant and has central charge cvir=2. When one of these parameters is zero, the Bethe ansatz equations admit an infinite number of solutions with lowest energy.


Search For Top In Pp̄ Collisions At [Square Root Of S] = 1.8 Tev By Constrained Kinematic Fitting , Myungyun Pang Jan 1994

Search For Top In Pp̄ Collisions At [Square Root Of S] = 1.8 Tev By Constrained Kinematic Fitting , Myungyun Pang

Retrospective Theses and Dissertations

A search for the top quark has been pursued in pp collision at √s = 1.8 TeV with the DO detector. This documentation describes a method introduced to extract the mass of the top quark and the cross section limits on tt production. Also a preliminary result from the DO experiment is described.