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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

#### 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 c_{vir}=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

#### 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.