# New physics effects in tree-level decays and the precision in the determination of the quark mixing angle γ

@article{Brod2015NewPE,
title={New physics effects in tree-level decays and the precision in the determination of the quark mixing angle $\gamma$},
author={Joachim Brod and Alexander Lenz and Gilberto Tetlalmatzi-Xolocotzi and Martin Wiebusch},
journal={Physical Review D},
year={2015},
volume={92},
pages={033002}
}
• Published 3 December 2014
• Physics
• Physical Review D
We critically review the assumption that no new physics is acting in tree-level B-meson decays and study the consequences for the ultimate precision in the direct determination of the Cabibbo-Kobayashi-Maskawa (CKM) angle γ. In our exploratory study we find that sizeable universal new physics contributions, ΔC1,2, to the tree-level Wilson coefficients C1,2 of the effective Hamiltonian describing weak decays of the b quark are currently not excluded by experimental data. In particular, we find…
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