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- W2957716198 abstract "In this paper we consider two-loop two-, three- and four-point diagrams with elliptic structure in the case of two different masses $m$ and $M$. The latter diagrams generally arise within NRQCD matching procedures and are relevant for parapositronium decay and top pair production at threshold. We present the obtained results in several different representations: series solution with binomial coefficients, integral representation and representation in terms of generalized hypergeometric functions. The results are valid up to $mathcal{O}(varepsilon)$ terms in $d=4-2varepsilon$ space-time dimensions. In the limit of equal masses $m=M$ the obtained results are written in terms of elliptic constants with explicit series representation." @default.
- W2957716198 created "2019-07-23" @default.
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- W2957716198 date "2019-11-01" @default.
- W2957716198 modified "2023-10-06" @default.
- W2957716198 title "Two-loop diagrams in nonrelativistic QCD with elliptics" @default.
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- W2957716198 doi "https://doi.org/10.1016/j.nuclphysb.2019.114780" @default.
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