182 citations · 479 across the 9 of their papers we have counts for
9 papers
HQET quark-gluon vertex at one loop
A. I. Davydychev, A. G. Grozin
We calculate the HQET quark-gluon vertex at one loop, for arbitrary external momenta, in an arbitrary covariant gauge and space-time dimension. Relevant results and algorithms for…
New results for the epsilon-expansion of certain one-, two- and three-loop Feynman diagrams
A. I. Davydychev, M. Yu. Kalmykov
For certain dimensionally-regulated one-, two- and three-loop diagrams, problems of constructing the epsilon-expansion and the analytic continuation of the results are studied. In…
Some remarks on the epsilon-expansion of dimensionally regulated Feynman diagrams
A. I. Davydychev, M. Yu. Kalmykov
Some problems related to construction of the epsilon-expansion of dimensionally regulated Feynman integrals are discussed. For certain classes of diagrams, an arbitrary term of the…
Threshold expansion of the sunset diagram
A. I. Davydychev, V. A. Smirnov
By use of the threshold expansion we develop an algorithm for analytical evaluation, within dimensional regularization, of arbitrary terms in the expansion of the (two-loop) sunset…
Effect of m_c on b quark chromomagnetic interaction and on-shell two-loop integrals with two masses
A. I. Davydychev, A. G. Grozin
The effect of non-zero c quark mass on b quark HQET Lagrangian, up to 1/m_b level, is calculated at two loops. The results are expressed in terms of dilogarithmic functions of m_c/…
Geometrical approach to the evaluation of multileg Feynman diagrams
A. I. Davydychev, R. Delbourgo
A connection between one-loop -point Feynman diagrams and certain geometrical quantities in non-Euclidean geometry is discussed. A geometrical way to calculate the corresponding…