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+ | ====== TTP10-16 Epsilon-K at NNLO: The Charm-Top-Quark Contribution ====== | ||
+ | |||
+ | |||
+ | < | ||
+ | charm-top-quark contribution eta_ct to the effective Delta S = 2 | ||
+ | Hamiltonian in the Standard Model. eta_ct represents an important part | ||
+ | of the short distance contribution to the parameter epsilon_K. We | ||
+ | | ||
+ | Q_S2, the three-loop mixing of the current-current and penguin | ||
+ | operators into Q_S2, and the corresponding two-loop matching | ||
+ | conditions at the electroweak, | ||
+ | | ||
+ | 0.046, which is roughly 7% larger than the next-to-leading-order (NLO) | ||
+ | value eta_ct(NLO) = 0.455 +/- 0.069. This results in a prediction for | ||
+ | | ||
+ | enhancement of approximately 3.3% with respect to the value obtained | ||
+ | using eta_ct(NLO). </ | ||
+ | |**Joachim Brod and Martin Gorbahn** | ||
+ | |** Phys.Rev. D82 094026 2010 ** | | ||
+ | | {{preprints: | ||
+ | | | |