The ultimate theoretical error on gamma from B -> D K decays
Joachim Brod, Jure Zupan
TL;DR
This paper calculates the minimal theoretical uncertainty in measuring the CKM angle gamma from B -> D K decays, showing it is negligible for current and future experiments.
Contribution
It provides a detailed estimate of second-order electroweak corrections, confirming their negligible impact on gamma extraction.
Findings
Electroweak corrections induce a shift |delta gamma| <~ 10^-7
Theoretical error is negligible compared to experimental precision
Supports the robustness of gamma measurements from B -> D K decays
Abstract
The angle gamma of the standard CKM unitarity triangle can be determined from B -> D K decays with a very small irreducible theoretical error, which is only due to second-order electroweak corrections. We study these contributions and estimate that their impact on the gamma determination is to introduce a shift |delta gamma| <~ O(10^-7), well below any present or planned future experiment.
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