A novel unbinned model-independent method to measure the CKM angle $\gamma$ in $B^{\pm }\to D{K}^{\pm }$ decays with optimised precision

Abstract

We present a novel unbinned method to combine $B^{\pm }\to D{K}^{\pm }$ and charm threshold data for the amplitude-model unbiased measurement of the CKM angle gamma in cases where the D meson decays to a three-body final state. The new unbinned approach avoids any kind of integration over the D Dalitz plot, to make optimal use the available information. We verify the method with simulated signal data where the D decays to $K_S{\pi }^{+}{\pi }^{-}$. Using realistic sample sizes, we find that the new method reaches the statistical precision on gamma of an unbinned model-dependent fit, i.e. as good as possible and better than the widely used model-independent binned approach, without suffering from biases induced by a mis-modeled D decay amplitude.

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