The angle γ of the standard CKM unitarity triangle can be determined from B → DK 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 γ determination is to introduce a shift |δγ| ≲ O( 10⁻⁷ ) , well below any present or planned future experiment.
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A 2014 study studied this question.
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