High Order Corrections in the Relativistic Perturbation Theory with the Model Zeroth Approximation, Mg-Like and Ne-Like Ions

1985 ◽  
Vol 32 (5) ◽  
pp. 513-522 ◽  
Author(s):  
E P Ivanova ◽  
L N Ivanov ◽  
A E Kramida ◽  
A V Glushkov
Keyword(s):  
Perturbation Theory ◽  
High Order ◽  
Zeroth Approximation ◽  
Relativistic Perturbation Theory

THE CALCULATION OF VARIOUS QUANTITIES WITHIN PERTURBATION THEORY AT THE 3- AND 4-LOOP ORDER

1995 ◽  
Vol 06 (04) ◽  
pp. 513-518 ◽  
Author(s):  
T. VAN RITBERGEN ◽  
J.A.M. VERMASEREN ◽  
S.A. LARIN ◽  
P. NOGUEIRA
Keyword(s):  
Perturbation Theory ◽  
Quark Mass ◽  
Decay Rates ◽  
High Order ◽  
Loop Order ◽  
Perturbative Calculations ◽  
Methods And Techniques ◽  
Mass Expansion

We discuss methods and techniques that were recently used in the following high order perturbative calculations: the large quark mass expansion of the decay rates Z0→ hadrons and τ→ν+ hadrons and the calculation of various quantities for deep inelastic lepton hadron scattering. Progress on the automatization of some general procedures is discussed.

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