he p - th / 9 71 02 09 28 O ct 1 99 7 DPNU - 97 - 52 October

ar X iv : h ep - p h / 97 10 22 9 v 1 2 O ct 1 99 7 SLAC - PUB - 7663 October 1997 Z ′ INVESTIGATIONS AT FUTURE LEPTON

- th / 9 71 00 02 v 1 1 O ct 1 99 7 NUCLEAR MANY - BODY PROBLEM AT FINITE TEMPERATURE : A TFD APPROACH

Based on the formalism of thermo-field dynamics a new approach for studying collective excitations in hot finite Fermi systems is presented. Two approximations going beyond the thermal RPA namely renormalized thermal RPA and thermal second RPA are formulated.

n uc l - th / 9 71 10 53 v 1 2 5 N ov 1 99 7 USC ( NT ) - 97 - 09 , nucl - th / 9711053 Chiral Perturbation Theory

Chiral symmetry serves as a guiding principle in low-energy hadron dynamics. An effective lagrangian, which explicitly breaks chiral symmetry via a small mass term, allows for a systematic method of calculating higher order corrections to tree-level results. This is applied to radiative muon capture on hydrogen, and to proton-proton π 0 production near threshold. Both processes pose theoretical...

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ar X iv : s ol v - in t / 9 71 00 04 v 1 7 O ct 1 99 7 México ICN - UNAM 97 - 12 Two - body

Two Lie algebraic forms of the 2-body Elliptic Calogero model are presented. Translation-invariant and dilatation-invariant discretizations of the model are obtained.