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All order ε-expansion of Gauss hypergeometric functions with integer and half/integer values of parameters

Mikhail Yu. Kalmykov1,2, Bennie F.L. Ward3 and Scott Yost3

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It is proved that the Laurent expansion of the following Gauss hypergeometric functions,

2F1 (I1+aε, I2+bε; I3+c ε;z) ,

2F1 (I1+aε, I2+bε; I3+½+c ε;z) ,

2F1 (I1+½+aε, I2+bε; I3+c ε;z) ,

2F1 (I1+½+aε, I2+bε; I3+½ + c ε;z) ,

2F1 (I1+½+aε, I2+½+bε; I3+½ + c ε;z) ,

where I1,I2,I3 are an arbitrary integer nonnegative numbers, a,b,c are an arbitrary numbers and ε is an arbitrary small parameters, are expressible in terms of the harmonic polylogarithms of Remiddi and Vermaseren with polynomial coefficients. An efficient algorithm for the calculation of the higher-order coefficients of Laurent expansion is constructed. Some particular cases of Gauss hypergeometric functions are also discussed.


Keywords

Differential and Algebraic Geometry

NLO Computations

 

E-print Number: hep-th/0612240

Cited: by |

Refers: to

PACS

02.30.Gp Special functions

02.10.Ud Linear algebra

02.10.De Algebraic structures and number theory

11.10.-z Field theory

MSC

33Cxx Hypergeometric functions

15A18 Eigenvalues, singular values, and eigenvectors

81T18 Feynman diagrams

Subjects

Mathematical physics

Particle physics and field theory

Dates

Issue 02 (February 2007)

Received 10 January 2007, accepted for publication 24 January 2007

Published 13 February 2007



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