TTP21-015 Two-loop QCD penguin contribution to width difference in $B_s-\bar{B}_s$ mixing
TTP21-015 Two-loop QCD penguin contribution to width difference in $B_s-\bar{B}_s$ mixing
Marvin Gerlach, Ulrich Nierste, Vladyslav Shtabovenko, Matthias Steinhauser
JHEP 07 (2021) 043
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arXiv