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Abstract: We establish irrational constants, that contribute to the positroniumlifetime at $O\alpha$ and $O\alpha^2$ order. In particular we show, that anew type of constants appear, which are not related to Euler-Zagier sums ormultiple $\zeta$ values.



Autor: B. A. Kniehl, A. V. Kotikov, O. L. Veretin

Fuente: https://arxiv.org/







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