ar X iv : h ep - p h / 99 08 37 7 v 1 1 7 A ug 1 99 9 Matching Heavy Particle Approach to Relativistic Theory

ar X iv : h ep - p h / 99 08 37 7 v 2 3 S ep 1 99 9 Matching Heavy Particle Approach to Relativistic Theory

On the simple model of interacting massless and heavy scalar fields it is demonstrated that the technique of heavy baryon chiral perturbation theory reproduces the results of relativistic theory. Explicit calculations are performed for diagrams including two-loops.

ar X iv : h ep - p h / 99 10 26 0 v 1 7 O ct 1 99 9 Is Heavy Baryon Approach Necessary ?

On the simple model of interacting massless pseudoscalar and heavy fermion fields it is demonstrated that using appropriately chosen renormalization condition one can respect power counting within the relativistic theory without applying the technique of heavy baryon approach. Explicit calculations are performed for diagrams including two-loops. It is argued that the introduction of the heavy b...

ar X iv : h ep - p h / 98 05 37 5 v 1 1 9 M ay 1 99 8 Production of bound μ + μ − - systems in relativistic heavy ion collisions

ar X iv : h ep - p h / 95 08 24 5 v 1 5 A ug 1 99 5 UCSD / PTH 95 - 07 June 1995 EFFECTIVE FIELD THEORIES

These lectures introduce some of the basic notions of effective field theories, as used in particle physics. The topics discussed are the ∆S = 1 and ∆S = 2 weak interactions, and chiral perturbation theory as applied to mesons, baryons, and hadrons containing heavy quarks.

ar X iv : h ep - p h / 99 08 37 9 v 1 1 7 A ug 1 99 9 DESY 99 - 113 TAUP 2594 - 99 February 1 , 2008 Screening Effects on F

In this talk we discuss how deeply the region of high parton densities has been studied experimentally at HERA. We show that the measurements of deep inelastic structure functions at HERA confirm our theoretical expectation that at HERA we face a challenging problem of understanding a new system of partons: quarks and gluons at short distances with so large densities that we cannot treat this s...