# Irrational constants in positronium decays - High Energy Physics - Phenomenology

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.

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

Source: https://arxiv.org/