ar X iv : h ep - p h / 05 09 05 5 v 1 6 S ep 2 00 5 Two - photon - exchange effects in the electro - excitation of the ∆ resonance

ar X iv : h ep - p h / 05 09 11 6 v 1 12 S ep 2 00 5 Gauge Principle and QED ∗

One of the major developments of twentieth century physics has been the gradual recognition that a common feature of the known fundamental interactions is their gauge structure. In this talk the early history of gauge theory is reviewed, emphasizing especially Weyl’s seminal contributions of 1918 and 1929.

ar X iv : h ep - p h / 05 12 21 6 v 1 1 6 D ec 2 00 5 QUANTIZATION AND HIGH ENERGY UNITARITY IN ORBIFOLD THEORIES

ar X iv : h ep - p h / 05 10 05 6 v 1 5 O ct 2 00 5 One - loop Renormalization of Resonance Chiral Theory with Scalar and Pseudoscalar Resonances ∗

The divergent part of the generating functional of the Resonance Chiral Theory is evaluated up to one loop when one multiplet of scalar and pseudoscalar resonances are included and interaction terms which couple up to two resonances are considered. Hence we obtain the renormalization of the couplings of the initial Lagrangian and, moreover, the complete list of operators that make this theory f...

ar X iv : h ep - p h / 05 07 16 7 v 5 6 S ep 2 00 5 Ring - like events : Cherenkov gluons or Mach waves ?

Similar to electromagnetic forces, strong interactions might induce such collective effects as Cherenkov and Mach waves. Their conical structure would be responsible for specific ring-like events. The theoretical and experimental arguments in favor of these phenomena are discussed and their most important features are described.

ar X iv : h ep - t h / 05 09 04 5 v 1 6 S ep 2 00 5 A Bethe Ansatz Study of Free Energy and Excitation Spectrum for even spin Fateev Zamolodchikov Model

A Bethe Ansatz study of a self dual ZN spin model is undertaken for even spin system. One has to solve a coupled system of Bethe Ansatz Equations (BAE) involving zeroes of two families of transfer matrices. A numerical study on finite size lattices is done for identification of elementary excitations over the Ferromagnetic and Antiferromagnetic ground states. The free energies for both Ferromag...